Kambiz Nouri; Seyede Nahid Shetab Booshehri; Mohammadreza Doustan
Abstract
Given the importance of preparation to respond to two stimuli in different sport conditions, the aim of this study was to investigate the effect of foreperiod and time intervals between two stimuli on psychological refractory period (PRP) in athletes. This study was semi-experimental with a within-group ...
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Given the importance of preparation to respond to two stimuli in different sport conditions, the aim of this study was to investigate the effect of foreperiod and time intervals between two stimuli on psychological refractory period (PRP) in athletes. This study was semi-experimental with a within-group design and fundamental-applied in terms of objectives. 50 male athlete students of Shahid Chamran University of Ahvaz (age range 22.47±1.45 years) were selected by convenience sampling method. A five-core processor ASUS notebook, Edinburgh Handedness Questionnaire, software and hardware to measure the psychological refractory period were used in this study. Participants responded to two visual (selective) stimuli that were presented with short time intervals as quickly as possible. Tests were conducted in dual tasks and single tasks in foreperiods of 1,2,4,8 s and time intervals of 100, 250, 500, 800 ms randomly. The data were analyzed using mean, standard deviation, within group analysis of variance at significance level (P<0.05). The results showed that the effects of foreperiod and the stimuli intervals were significant. The foreperiod of 1s and interval of 100 ms had the most psychological refractory period and foreperiod of 8s and interval of 800 ms had the lowest psychological refractory period. This study showed that the pattern of psychological refractory period was affected by experimental manipulation of the preparation processes when recognizing the stages of information processing. Contrary to the common belief that preparation time operates on premotor processes, in the present study preparation time operates on late motion processes and confirms the existence of processing bottlenecks in dual tasks
Elahe Arabameri; Shida Ehsani; Mohammad Reza Dehkhoda; Mansoor Sayah
Volume 1, Issue 3 , January 2009, , Pages 83-97
Abstract
The purpose of this study was to investigate general health condition, outbreak of depression and body mass index (BMI) in athlete and non-athlete students of Tehran University. Both female and male junior students participated in this study and 200 students, 50 athletes and 50 non-athletes were selected. ...
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The purpose of this study was to investigate general health condition, outbreak of depression and body mass index (BMI) in athlete and non-athlete students of Tehran University. Both female and male junior students participated in this study and 200 students, 50 athletes and 50 non-athletes were selected. In order to determine general health and outbreak of depression, questionnaires of general health and Beck's depression test were used, and in order to determine BMI, height and weight of the subjects were measured. In order to analyze the data, two-way ANOVA test and Pearson correlation coefficient were used. The results of this study showed no significant difference in the average value of BMI between athlete and non-athlete students based on their gender (P=0.09), but there was a significant difference in BMI between female and male students. No significant interaction was observed between gender and physical activity in BMI index. There was a significant difference in general health between athlete and non-athlete students based on their gender (P=0.007). There were no significant differences among general health subscales, BMI and Beck scores of students based on their gender and physical activity. However, there was a significant relationship between GHQ28 subscales and Beck scores based on gender and physical activity.
Mahta Eskandarnejad; Zahra Hoseinzadeh
Abstract
Introduction: Athletes in team sports must make many decisions when perceiving and interpreting available environmental information regarding the position of the ball,teammates, and opposing players while taking appropriate actions. Considering the nature of volleyball and the need to pay attention to ...
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Introduction: Athletes in team sports must make many decisions when perceiving and interpreting available environmental information regarding the position of the ball,teammates, and opposing players while taking appropriate actions. Considering the nature of volleyball and the need to pay attention to multiple stimuli during training and matches, a high capacity for cognitive abilities such as working memory seems essential. This research aimed to compare the effectiveness of spatial and numerical working memory of skilled and semi-skilled volleyball players following decision-making exercises.Methods: sixty female volleyball players, 30 of them for the semi-skilled group (15 people for each of the training and control groups) and 30 for the skilled group (15 people for each of the training and control groups) with the age range of 19-25 years were selected according to purposive sampling method. The protocol of decision-making exercises was carried out for 18 sessions and three blocks of 20-trial exercises were performed according to the training instructions for each group. The working memory capacity test was used to evaluate working memory. To test the hypothesis, due to the normal distribution of the data, the between- and within-groups factorial analysis of variance (mixed model) was used.Results: The results of the analysis at the significance level of α = 0.05 showed that there is a significant difference between the training groups, and the decision-making group got the highest score. The decision-making exercises at the semi-skilled level of proficiency compared to the skill level has a significant improvement in the spatial working memory variable.Conclusion: The result shows that exercises with high cognitive load can be a necessity to ncrease spatial working memory in semi-skilled female volleyball players.
Somayeh Bizadi zadeh; Morteza Nikoofar; Reza Delavar
Abstract
The aim of the present study was to investigate the effect of biorhythm cycle on physical ability of female volleyball players. The statistical population of the present study included of 120 female volleyball athletes in the age range of 17-20 in 1397 in Boshrouieh city. For this purpose, 30 volleyball ...
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The aim of the present study was to investigate the effect of biorhythm cycle on physical ability of female volleyball players. The statistical population of the present study included of 120 female volleyball athletes in the age range of 17-20 in 1397 in Boshrouieh city. For this purpose, 30 volleyball female athletes among participants are eligible to enter the study were selected by random sampling. Type of research in terms of purpose has been applied.and in terms of method, it's been semi-experimental which is done by field. In addition According to the date of birth of each subject their biorhythm diagram was plotted and they observed their cycles according to the biorhythm chart and the days of decline and in fitness tests including the Madison Ball throw, to evaluate upper body strength, agility test and vertical sagittal jump, to evaluate lower trunk muscle strength. To analyze the data in addition to using descriptive statistics indices, kolmogorov-Smirnov test and dependent t-test were used. The results showed there was a significant difference between the muscular strength of the subjects in the recharge and discharge days based on the biorhythm cycle (p= 0.035). and also, between the lower trunk muscular strength of subjects on recharge and discharge days based on the biorhythm cycle there is a significant difference (p= 0.004). There is a significant difference between agility of volleyball girls in recharge and discharge days based on biorhythm cycle (p= 0.004).
Daryoosh Khajavi; Razieh Khanmohamadi
Abstract
Physical activity has physiological, psychological, and social positive effects. However, the relationship between physical activities and depression of the elderly in the country is unknown. This study was designed to examine the relationship between physical activity and depression. The statistical ...
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Physical activity has physiological, psychological, and social positive effects. However, the relationship between physical activities and depression of the elderly in the country is unknown. This study was designed to examine the relationship between physical activity and depression. The statistical population consisted of the elderly of Arak city in 2013 and 263 subjects participate in the study. Data were collected with demographic characteristics questionnaire, Geriatric Depression Scale-short form, and Rapid Assessment of Physical Activity (RAPA) and analyzed with Pearson correlation coefficient, linear regression analysis, t test, ANCOVA test with SPSS-16 software. Findings indicated a significant relationship between depression and age, employment, fall history, economic status, physical activity, education, perceived health (P≤0.05). Variables of physical activity, fall history in the past year, economic status, and perceived health predicted depression (R2=0.358; P≤0.05). Mean score of physical activity in the male elderly was significantly higher than their female counterparts, and mean score of physical activity in 60-69-year-old group was significantly higher than their counterparts in 70-79 and ≤ 80-year-old groups (P≤0.05). There were no significant differences between age and gender and mean score of depression. These findings emphasize the importance of the effect of physical activity on depression in the elderly.
Maryam Shoja; Seyed Mohammad Kazem Vaez Mousavi; Abdollah Ghasemi
Abstract
The aim of this study was to investigate the effect of game-oriented exercises on motor development of overweight children with developmental coordination disorder. The research method was semi-experimental with pretest and posttest. 50 overweight children aged between 8 and 10 with developmental coordination ...
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The aim of this study was to investigate the effect of game-oriented exercises on motor development of overweight children with developmental coordination disorder. The research method was semi-experimental with pretest and posttest. 50 overweight children aged between 8 and 10 with developmental coordination disorder were selected and were randomly assigned to experimental (n=35) and control (n=15) groups after pretest. The experimental group participated in the protocol for 3 sessions per week during 3 months. MABC-2 test was used and SPSS 21 software was used for data analysis. The results of MANCOVA showed a difference between the experimental and control groups in at least one of the variables. Based on the results of one-way covariance analysis with a significance level of 0.05, there was a significant difference between the control and the intervention groups in motor development components and its subscales (hand speed, targeting and balance) and the experimental group got better scores. Therefore, it is recommended that the development of this disorder should be prevented in overweight individuals by designing different exercises and early intervention, and have a positive effect on their motor development.
Hosniyeh Barani; Marzie Balali; Esmail Nasiri
Abstract
Introduction: Task and environment constraints are very important in cognitive, perceptual, decision-making, and tactical behaviors. Task constraints are more specific than environmental constraints in performance context, therefore, the present research intended to examine the effect of manipulation ...
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Introduction: Task and environment constraints are very important in cognitive, perceptual, decision-making, and tactical behaviors. Task constraints are more specific than environmental constraints in performance context, therefore, the present research intended to examine the effect of manipulation of task constraints on functional indicators and the anxiety related to the fear of falling in the elderly.Methods: For this purpose, 45 elderly women (in the age range of 60 to 66 years) were randomly divided into three groups of manipulation of task constraints, without manipulation of task constraints, and control group. Then, the experimental groups performed exercises with manipulation of task constraints and exercises without manipulation of task constraints for eight weeks and three sessions per week for 45 minutes. The control group also continued their normal activities during the research period.Results: In this research, TUG and BESS tests were used to evaluate performance indicators, and Hamilton's anxiety evaluation scale was used to evaluate the anxiety index. The results of the analysis of covariance by removing the effect of the pre-test showed that in terms of performance and anxiety the group with the manipulation of the task constraints obtained significantly better results (P=0.001) than the group without manipulation and control group.Conclusion: The results of this research supported the use of various manipulations of task constraints as a kind of teaching strategy for the elderly. It also confirms the effect of exercises by manipulating the task constraints, which improves balance and reduces the fear of falling in the elderly. By improving this ability, the risk of falling in this social class is reduced.
Hossein Heydari; Rokhsareh Badami; Zohreh Meshkati
Abstract
AbstractIntroduction and Purpose: the purpose of the current study was to examine the comparison of the effect of sports vision training with and without inline hockey specific context on the speed and whole body reaction time of inline hockey players.Methods: In this semi experimental study, which was ...
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AbstractIntroduction and Purpose: the purpose of the current study was to examine the comparison of the effect of sports vision training with and without inline hockey specific context on the speed and whole body reaction time of inline hockey players.Methods: In this semi experimental study, which was performed with a pre-test-post-test design with a one- and four-week follow-up period, 60 novice male hockey players with an age range of 15 to For 20 years, they were accessibility selected and randomly divided into three groups: sports vision training with hockey specific context, sports vision training without hockey specific context and hockey specific context training. In the pre-test phase, the participants performed the desired tests (speed and whole body reaction time). The intervention phase lasted for nine weeks and 2 sessions per week and each session lasted 90 minutes, in which the groups did the relevant exercises. In the post-test phase, which was performed exactly after the last training session, and in the follow-up phase, which was performed after one and four weeks of non-training, the participants performed the desired tests as in the pre-test phase. Data were analyzed using repeated measures analysis of variance. Results: The results showed that sports vision exercises with and without hockey specific context and hockey specific context exercises have a significant effect on improving speed and whole body reaction time of inline hockey players. Other results indicated that superiority (greater effect size) of sports vision exercises with hockey specific context compared to other exercises.
Janbaba Aghaeinejad; Salar Faramarzi; Ahmad Abedi
Abstract
The current study aimed to examine the effect of a period of regular exercise onthe aggression of educable mentally retarded students aged between 9 and 15 inLordegan city. For this purpose, 28 students were selected randomly and dividedinto two groups: 7 boys and 7 girls in experimental group and 7 ...
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The current study aimed to examine the effect of a period of regular exercise onthe aggression of educable mentally retarded students aged between 9 and 15 inLordegan city. For this purpose, 28 students were selected randomly and dividedinto two groups: 7 boys and 7 girls in experimental group and 7 boys and 7 girls incontrol group. Ghezelseflu et al. (1387) aggression scale was used as a pretest forboth groups. A period of exercise program as an intervention program was run for2 months, every week, 3 sessions (45 minutes) per week on the experimental group.After intervention program, aggression scale was run again. The data wereanalyzed by covariance using spss software. The results showed that a significantdifference between control and experimental groups' performance (P<0.001) inaggression which showed that a period of exercise program reduced theaggression and its subscales in the experimental group. It was concluded thatregular exercise program reduced the aggression of educable mentally retardedstudents.
Mehdi Ghafoori; Mehdi Shahbazi; Parisa Rastegar; Ehsan Fatehi
Abstract
Emotional intelligence is the ability to understand and manage self-emotions and others' emotions and includes the intelligent use of emotions. This study aimed at investigating the emotional intelligence in male and female elite athletes in team and individual sport fields. The sample consisted of 62 ...
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Emotional intelligence is the ability to understand and manage self-emotions and others' emotions and includes the intelligent use of emotions. This study aimed at investigating the emotional intelligence in male and female elite athletes in team and individual sport fields. The sample consisted of 62 female elite athletes and 74 male elite athletes selected from different individual and team sports. They filled out Schutte's emotional intelligence scale. The obtained data were analyzed by two-way analysis of variance and independent t test at significance level of 0.05. The results showed no significant difference in emotional intelligence between male and female elite athletes (P>0.05). Findings also revealed no significant difference in emotional intelligence between individual and team sports (P>0.05). The results showed that female athletes benefit from emotional intelligence in their sport performance and progress as much as male athletes and also both individual and team athletes need the same degree of improvement of emotional intelligence and use it in their sport, so it is suggested that special exercises should be planned regardless of gender or sport type to increase emotional intelligence of athletes.
Daryoush Khajavi; Zahra Parsa
Abstract
Activities of daily life are basic components of life which reflect an important aspect of functional independence in the elderly. The aim of this study was to develop an up to date and culturally appropriate scale to assess activities of daily lives of the Iranian elderly. Research method was descriptive-analytic ...
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Activities of daily life are basic components of life which reflect an important aspect of functional independence in the elderly. The aim of this study was to develop an up to date and culturally appropriate scale to assess activities of daily lives of the Iranian elderly. Research method was descriptive-analytic and the statistical population consisted of elderly men and women (over 60 years old) residing in Arak and Shazand cities in 1391. The sample consisted of two groups including 297 subjects (exploratory factor analysis) and 280 subjects (confirmatory factor analysis) who voluntarily participated in the study. Exploratory and confirmatory factor analysis and principle component analysis with varimax rotation were used for data analysis. All statistical operations were performed with SPSS-16 and LISREL software. Exploratory factor analysis extracted 5 subscales including gross activities (9 items), personal activities (7 items), religious and social activities (8 items), fine activities (4 items), and machine washing (2 items). Confirmatory factor analysis findings confirmed these results as well. These five factors explained 75.90% of total variance (first factor 50.38%, second factor 11.06%, third factor 6.30%, forth factor 4.675%, and fifth factor 3.485%). This instrument was named "the Elderly's Activities of Daily Life Scale (Iran-ADLS)". The scale was filled out twice by 30 subjects (50% women) with 1 to 2 weeks of interval and Pearson correlation coefficient was 0.76 to 0.97 for 1 to 5 subscales and 0.97 for the total score of the scale, indicating a good to excellent test-retest reliability. Also, internal reliability was calculated with Chronbach's alpha (0.96) indicating an excellent internal reliability for this scale. Totally, these results confirmed that "the Elderly's Activities of Daily Life Scale" was a valid and reliable instrument to measure the elderly's ability and disability.
Valiollah Kashani; Mahshid Babaei; Behrouz Gol Mohammadi
Abstract
The aim of this study was to determine validity and reliability of the Persian version of the Flow in Computer Games Questionnaire so that the flow performance in computer gamers can be evaluated. 400 gamers (237 males; 163 females) were selected by random cluster sampling method and completed the Persian ...
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The aim of this study was to determine validity and reliability of the Persian version of the Flow in Computer Games Questionnaire so that the flow performance in computer gamers can be evaluated. 400 gamers (237 males; 163 females) were selected by random cluster sampling method and completed the Persian version of the Flow in Computer Games Questionnaire. In the first step, translation accuracy of the Persian version was confirmed through back translation method. Then, confirmatory factor analysis based on structural equations model was used to determine construct validity while Cronbach alpha coefficient was applied to determine internal consistency. Intra-class correlation in test-retest method was administered for temporal reliability of the items. The results indicated acceptable fit indices (CFI=0.92, TLI=0.75, RMSEA=0.062), internal consistency (ɑ=0.75) and temporal reliability (ICC=0.85) for the Persian version of the Flow in Computer Game Questionnaire. The results supported the multifactor structure and 23 items of the Flow in Computer Games Questionnaire. Therefore, the Persian version of the Flow in Computer Game Questionnaire has an acceptable validity and reliability among computer gamers and it can be used as a valid and reliable tool to evaluate the flow performance of these gamers in Iran.
Mojtaba Habibi; Mohamad.Ali Besharat; Fatemeh Ghareghozlou; Balal Izanloo; Mohammad Reza Zolfaghari
Volume 1, Issue 1 , July 2009, , Pages 93-114
Abstract
The purpose of the present study was to investigate mental health status in physical education teachers (PET) and non-physical education teachers (NPET) based on demographic characteristics. 403 teachers consisting of 105 PETs and 298 NPETs from West Azerbaijan province were selected by multiphase cluster ...
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The purpose of the present study was to investigate mental health status in physical education teachers (PET) and non-physical education teachers (NPET) based on demographic characteristics. 403 teachers consisting of 105 PETs and 298 NPETs from West Azerbaijan province were selected by multiphase cluster sampling method and completed mental health inventory (MHI). The results of the study revealed that PETs scored higher in psychological well-being than NPETs. Male teachers (PETs and NPETs) had higher scores in psychological well-being and lower scores in psychological distress than female teachers. Having a second job was negatively associated with psychological well-being in both PETs and NPETs. Married teachers showed lower psychological well-being than single teachers. Employed teachers had higher scores in psychological well-being than non-employed teachers. Male teachers who had an employed spouse showed lower psychological well-being than male teachers who had a non-employed spouse. No significant association was found between number of jobs, marital status, and employment status with psychological distress.
Alireza Farrar; Mostafa Khani; Aliakbar Jaberi Moghaddam; Ahmad Farokhi; Kimiya Sadri
Abstract
It is necessary to understand the effective factors in participation in physical activity in order to increase this activity in school students. The aim of the present study was to compare the level of physical activity between field dependent/ independent students in guidance schools of Kharame city ...
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It is necessary to understand the effective factors in participation in physical activity in order to increase this activity in school students. The aim of the present study was to compare the level of physical activity between field dependent/ independent students in guidance schools of Kharame city of Fars province. At first 150 male students were randomly selected and after Frame and Rod test, 100 subjects were divided into two groups: field dependent group (mean age of 12.82±0.96 years, height 155.9±6.65 cm, weight 47.5±12.27 Kg) and field independent group (mean age of 13.32±0.89 years, height 158.1±8.61 cm, weight 51±15.74 Kg). Frame and Rod test was used to measure dependence and independence and Self-assessed Physical Activity Checklist was used to evaluate physical activity. Kolmogorov-Smirnov test was used to check the normality of the data. Independent t test was used for statistical analysis in SPSS Version 17 (?=0.05). There was a significant difference in duration of physical activity between students with field dependent/independent cognitive styles (p=0.000). There was a significant difference in duration of moderate to burst physical activity between students with field dependent/independent cognitive styles (p=0.018). There was a significant difference in MET scores between students with field dependent/independent cognitive styles (p=0.000). There was a significant difference in MET of moderate to burst physical activity between students with field dependent/independent cognitive styles (p=0.012). The results of this study showed that students with field independent cognitive styles had more physical activity and energy expenditure than field independent students. It was concluded that the field dependent students may have more motor impairments and this claim needs more studies to be approved. Moreover, since cognitive style, as one of the variables which are the result of the interaction between the environment and individual and can be changed and developed, can be interfered, it is suggested that cognitive styles of the students change and encourage them in physical activity and healthier life through educational strategies.
Borhanaldin Ghari; Hasan Mohammadzadeh; Jalal Dehghanizadeh
Abstract
The aim of this study was to investigate the relationship between performance and the perception of size of target under internal and external attention focus conditions as well as the relationship between the initial perception of the size of target and performance. 70 male students (mean age ...
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The aim of this study was to investigate the relationship between performance and the perception of size of target under internal and external attention focus conditions as well as the relationship between the initial perception of the size of target and performance. 70 male students (mean age of 21±1.6 years) voluntarily participated in this study. They were randomly assigned to internal and external attention focus based on the type of attentional instruction. Subjects performed dart throwing task in 20 trials. The target size estimation test was performed before the trials, after the last trial and after the first successful trail. Pearson correlation coefficient was used for data analysis. The results showed a significant and positive relationship between the performance and perception of target size in external focus group. But in internal focus group, a significant relationship between performance and perception of the size of the target was not observed. Also, there was no significant relationship between the initial perception and performance in both groups. It is suggested that the focus of attention can be a mediating factor for action-specific perception phenomenon.
Ali Akbar Jaberi Moghadam; Akram Mashalahi; Farhad Ghadiri; Masoud Soleimani
Abstract
The aim of the present study was to compare the health-related quality of life between active and inactive boys with cerebral palsy (CP) aged between 13 and 18. For this purpose, out of 150 CP students of guidance and high schools, 28 subjects were selected randomly. The subjects were divided into two ...
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The aim of the present study was to compare the health-related quality of life between active and inactive boys with cerebral palsy (CP) aged between 13 and 18. For this purpose, out of 150 CP students of guidance and high schools, 28 subjects were selected randomly. The subjects were divided into two groups of active (14 boys) and inactive (14 boys) according to physical activity questionnaire. The kid screen questionnaire with 10 subscales of physical well-being, psychological well-being, mood and emotions, self-perception, autonomy, relationship with parents and home, peer and social support, school environment, social acceptance and financial resources was used to test the proposed hypotheses. The reliability and validity of this instrument was confirmed (p=0.85). Multivariate analysis of variance (MANOVA) was used to analyze the data. The results showed that active cerebral palsy boys have higher health-related quality of life (p<0.05). In subscales, active students were better in physical well-being, mood and emotions, psychological well-being, financial resources and peer and social support than inactive students (P<0.05) but in self-concept, autonomy, social acceptance, school environment and relationship with parents and home, no significant difference was observed between the two groups (P>0.05). The results of this study indicated that positive attitudes of active children towards themselves related to their regular physical activity.
Fatima Bahrami; Ahmadreza Movahedi; Mohammad Marandi; Ahmad Abedi
Abstract
The aim of the present investigation was to determine the effect of two karate
techniques on the reduction in stereotypic behaviours in three 5-year-old boys with
autistic disorders. The study included three boys with autistic disorders. A singlesubject
method with A-B-A design was used. Participants ...
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The aim of the present investigation was to determine the effect of two karate
techniques on the reduction in stereotypic behaviours in three 5-year-old boys with
autistic disorders. The study included three boys with autistic disorders. A singlesubject
method with A-B-A design was used. Participants of the present study were
required to exercise two karate techniques (Zuki and Mae-Geri) for 12 weeks.
Changes in the severity of stereotypic behaviours were assessed by Gilliam Autism
Rating Scale (second edition) during intervention process and during one month
after intervention with one-week intervals. Results showed that with respect to
descriptive statistics and visual analytics, the karate techniques had an effect on all
three participants (PND=100% for first and third participants, PND=50% for the
second participant) and this reduction was maintained one month after the end of
the intervention. The findings of the present study indicated that teaching karate
techniques to autistic children dramatically decreased their stereotypic behaviours.
Manochehr Ghalkhani; Ali Heirani; Vahid Tadibi
Volume 3, Issue 2 , October 2012, , Pages 99-117
Abstract
Cognitive teaching methods facilitate the acquisition of motor skills; among these methods, the combination of physical, observational and imagery exercises has been the focus of recent investigations. The aim of this study was to investigate the facilitative effect of the combination of physical, observational ...
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Cognitive teaching methods facilitate the acquisition of motor skills; among these methods, the combination of physical, observational and imagery exercises has been the focus of recent investigations. The aim of this study was to investigate the facilitative effect of the combination of physical, observational and imagery exercises on immediate and delay retention of badminton high serve. The statistical population consisted of all male Razi University students. 84 students (mean age of 20.42+1.4 yr and score of imagery ability of 48.69+6.19) voluntarily participated in this study. Pretest included immediate and delay retention of badminton high serve using Scott and Fox test. Then, participants were assigned to homogenous groups according to their pretest (each group 12 participants): physical, observation, imagery, physical-observation, physical-imagery, observation-imagery, and physical-observation-imagery. Participants accomplished three sessions of 90 trials of badminton high serve. At the end of the final training session, an immediate test of retention was administered followed by a test of delay retention after 48 hours. One-way ANOVA test indicated that in both immediate and delay retention, the physical-observation-imagery group and the physical group significantly performed high serve better than other groups (p
Farhang Yazdanparast; Hamid Salehi; Shahram Lenjannejadian
Abstract
Pressure refers to the feelings an athlete has about performing in a competitive situation. The primary aim of this study was to examine kinematic changes of tennis serves in increasing competitive pressure. 20 semi-professional right-handed male tennis players completed 120 serves under low (normal) ...
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Pressure refers to the feelings an athlete has about performing in a competitive situation. The primary aim of this study was to examine kinematic changes of tennis serves in increasing competitive pressure. 20 semi-professional right-handed male tennis players completed 120 serves under low (normal) and high competitive pressure phases. Pressure checks (heart rate and perceived competitive state anxiety) were administered before serves in the low and the high-pressure phases. Performance and kinematic parameters of the serves (two-dimensional motion analysis) were also measured. The pressure manipulation showed a significant increase in the heart rate and perceived pressure from the low pressure to the high pressure (P<0.001). Decreased performance showed that the choking effect under pressure was observed (P<0.001). Results showed that the height of serves significantly decreased under pressure (P<0.001), while the ball speed remained unchanged (P>0.05). This study explained performance changes under competitive pressure using kinematic factors.
Saeed Arsham; Farzam Farahman; Fazlolah Bagheradeh; Elahe Arab ameri; Anoushirvan Kazemnejad
Volume 1, Issue 2 , October 2009, , Pages 103-126
Abstract
The aim of the present study was to introduce the methods to extract and to interpret cinematic data in order to explain movement pattern changes via joint coupling and freezing/freeing phenomena in a healthy right-dominant college male (age:26, height: 172 cm, weight: 80 kg) who practiced balance maintenance ...
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The aim of the present study was to introduce the methods to extract and to interpret cinematic data in order to explain movement pattern changes via joint coupling and freezing/freeing phenomena in a healthy right-dominant college male (age:26, height: 172 cm, weight: 80 kg) who practiced balance maintenance on a stabilometer. Data were gathered using a three-dimensional registration system which consisted of three cameras and a computer program (Sharif Motion Analyzer-SMA) in MATLAB software and measured the position of 19 passive markers located on subject's limbs and stabilometer. Before each trial, the system was calibrated by a metal frame of known dimensions to transform the two-dimensional camera detector values to real three-dimensional coordinates. Then, the following variables were calculated for the first, fifth and ninth trail from a 3(session) × 3(trail) course of practice: 1) stabilometer variability as a performance index; 2) absolute and relative variability of joint angles to evaluate possible freezing-freeing process; 3) cross-correlations between the angular time series in order to evaluate the presence of joint coupling. Finally, the interpretation method to extract variables was presented and some limits of such studies regarding the variability in degrees of freedom were provided.
Amir Vazinitaher; Mehdi Shahbazi; Fazlolah Bagherzadeh
Volume 3, Issue 1 , June 2011, , Pages 103-128
Abstract
Talent identification is a process through which those with the highest chance to succeed in the future will be determined. The purpose of the present study was to investigate the application of a multivariate approach in talent identification of adolescent soccer players. The research population consisted ...
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Talent identification is a process through which those with the highest chance to succeed in the future will be determined. The purpose of the present study was to investigate the application of a multivariate approach in talent identification of adolescent soccer players. The research population consisted of all soccer players in Tehran province aged between 12 and 16 years old. A battery of tests was applied to measure the psychological, technical, physiological and anthropometric factors in adolescent soccer players in two levels of elite (N=26) and sub-elite (N=35). Participants were divided into four age groups: U16, U15, U14, and U13. The OMSAT – 3 was used to evaluate the mental skills. Furthermore, technical skills were measured by six soccer skills tests of Football Association of England. Physiological measurements consisted of vertical jump, sit up, 10m sprint, 40m sprint and 280m shuttle run. Anthropometric characteristics were height, weight, body mass index, length of lower and upper leg, skin folds in four regions and body fat percentage. Statistical method to analyze the findings was MANOVA. The results showed that among four groups of factors, the physiological measures were statistically more capable of distinguishing the levels. The results of the present study showed a significant difference between elite and sub-elite soccer players in physiological, technical and psychological characteristics, but there was no significant difference in anthropometric attributes. There was a significant difference between elite and sub-elite soccer players in sit up, shuttle run, 10m sprint, 40m sprint, running with ball, turning, speed, dribbling, shooting, goal setting, relaxation, coping with stress, activation, focus, refocus and competition plan (P
Hakimeh Akbari
Abstract
Fundamental motor skills are the bases of special motor skills. In addition tomaturation, environmental promotion can influence these skills. The aim of thisstudy was to investigate and compare the effect of developmental gymnasticinstructional program and Spark motor program as motor experiences onfundamental ...
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Fundamental motor skills are the bases of special motor skills. In addition tomaturation, environmental promotion can influence these skills. The aim of thisstudy was to investigate and compare the effect of developmental gymnasticinstructional program and Spark motor program as motor experiences onfundamental motor skills development in children aged between 6 and 8. For thispurpose, 120 children (6–8 years old) were selected from Tehran primary schoolsby cluster random sampling method. After the pretest (test of gross motordevelopment, second edition, Ulrich), the subjects were divided into three groupsof Spark motor program, developmental gymnastic instructional program andcontrol. The programs were performed for one year (36 weeks, one session perweek, 30 minutes per session). In the 37th week, the posttest was performed. Datawere analyzed by paired sample t test and one-way ANOVA. The results showedthat Spark program and gymnastic program outperformed the control group infundamental motor skills and locomotion (P˂0.05) and the difference between thetwo experimental groups was not significant. Spark program was more effectivethan gymnastic program and control group in the development of manipulationskills. Gymnastic program was more effective than the control group in thedevelopment of manipulation skills (P˂0.05). Thus, it can be concluded thatinstructional programs can be considered as a proper motor experience forchildren. These programs can be used to develop motor skills at schools through providing suitable opportunities for more training and presenting developmental motor tasks.
Ahmad Varzaveh; Mehdi Zarghami; Esmaeil Saemi; Hosein Molania
Volume 2, Issue 1 , April 2010, , Pages 115-131
Abstract
The main purpose of this study was to examine the effect of metamotivational states on self-efficacy perceptions and motor performance in dart throwing beginners in easy and difficult conditions. For this purpose, the paratelic dominance questionnaire (Cook & Gerkovich, 1993) was distributed among 140 ...
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The main purpose of this study was to examine the effect of metamotivational states on self-efficacy perceptions and motor performance in dart throwing beginners in easy and difficult conditions. For this purpose, the paratelic dominance questionnaire (Cook & Gerkovich, 1993) was distributed among 140 male students, and 32 participants were randomly divided into two groups (16 in a telic group and 16 in a paratelic group). Each task consisted of three blocks of eight trials, and each trail consisted of 4 throws. Participants completed the Self-Efficacy Scale (Feltz & Chase, 1998) in their pretest and after trials 8, 16, 24. Data were analyzed with repeated measure, ANCOVA test and LSD post hoc test. The results showed a significant difference between paratelic and telic participants in self-efficacy perception (difficult task), and no significant difference in motor performance. Overall, the study only partially confirmed the reversal theory.
Kimiya Mostafavi; Mahiodin Bahari; Afsaneh Sanatkaran
Abstract
The aim of this study was to examine the effect of shooting training with air gun on aggression in adolescent girls. This study was semi-experimental including pretest, posttest with a control group. 30 female aggressive students (age: 16±1.1 years) were selected by convenience sampling method ...
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The aim of this study was to examine the effect of shooting training with air gun on aggression in adolescent girls. This study was semi-experimental including pretest, posttest with a control group. 30 female aggressive students (age: 16±1.1 years) were selected by convenience sampling method and were randomly assigned to experimental and control groups. Buss and Perry (1992) aggression questionnaire was used to evaluate aggression. The experimental group participated in shooting training for 12 sessions (each session 60 minutes) under a coach's supervision. After the last training session, the two groups participated in the posttest. The results of the two-way multivariate analysis of variance showed that shooting training significantly reduced aggression, verbal aggression, hostility and anger but shooting training had no significant effect on physical aggression. It seems that shooting training has an atmosphere and characteristics that can play an important role in producing calmness and reducing aggression.
Amir Dana; Saleh Rafiee
Abstract
Reaching and grasping is one of the most basic fundamental skills. The aim of this study was to address the differences of movement variability and movement smoothness in reaching and grasping in children and adults. 60 children (age range: 8-13 years old) were divided into 6 groups. The task used in ...
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Reaching and grasping is one of the most basic fundamental skills. The aim of this study was to address the differences of movement variability and movement smoothness in reaching and grasping in children and adults. 60 children (age range: 8-13 years old) were divided into 6 groups. The task used in the study included reaching and grasping a cube with the dimension of 3.6 cm
3
which provided the palmar grasp for all children. Subjects had to grasp the cube with their dominant hands and brought it near their mouth. In addition, a group of adults participated in this study (age range: 24+1.2). Participants performed 10 trials and kinematic variables including mean squared jerk, dimensionless jerk, range of motion of elbow joint, and variability in coordination pattern were calculated. One-way ANOVA was used to analyze the data in each variable. The results showed that the 13-year-old group was significantly different than adult group in the mean squared jerk and dimensionless jerk. It was observed that 8- and 9-year-old groups had significant differences with other groups in range of motion of elbow joint and variability in coordination pattern; however, there was no differences among other groups. Overall, the results showed that the growth process of reaching and grasping is not limited to the early childhood. These results were interpreted according to the development of motor control and asynchronous acquisition of kinematic variables in the process of movement skill learning.
