ahmad Ghotbi Varzaneh; hamed fahimi; Khajavi Daryoush
Abstract
Introduction:Children with developmental coordination disorder exhibit weaknesses in performing and tracking aiming-catching tasks. The present study aimed to investigate the effect of visual occlusion on aiming-catching skills and quiet eye duration in children with developmental coordination disorder. Methods: ...
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Introduction:Children with developmental coordination disorder exhibit weaknesses in performing and tracking aiming-catching tasks. The present study aimed to investigate the effect of visual occlusion on aiming-catching skills and quiet eye duration in children with developmental coordination disorder. Methods: In this semi-experimental study, which was conducted with a repeated measurement design, 26 children with developmental coordination disorder with an age range of 7 to 9 years were selected from among the girls and boys with developmental coordination disorder in Khorasgan Welfare and Rehabilitation Center of Isfahan. The participants threw 10 balls towards the wall and simultaneously catching the return ball under three conditions of full vision, initial occlusion, and late occlusion. At the same time as throwing and receiving the ball, the eye movements of the participants were recorded by a eye tracking device, as well as their performance score. The data were analyzed by within group analysis of variance with repeated measurements and Bonferroni post hoc test.Results: The results showed that the performance of aiming-catching skills and the length of the quiet eye period in the conditions of initial occlusion and late occlusion were significantly weakened compared to the conditions without occlusion (p<0.05). Also, the results showed that initial occlusion caused further weakening of aiming and catching skills as well as a shorter period of quiet eye compared to late occlusion (P<0.05).Conclusion: In general, the results of the present research support the role of the pre-programming system in the implementation of aiming and catching skills in children with developmental coordination disorders.
Niloufar Zamani Fard; Khajavi Daryoush; Ahmad Ghotbi Varzaneh
Abstract
Introduction: With the advent of research about the relationship between vision skills and sports performance, vision training was logical as the next step to provide an advantage for athletes. Therefore, the present study aimed to compare the effect of sports vision training and quiet eye training ...
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Introduction: With the advent of research about the relationship between vision skills and sports performance, vision training was logical as the next step to provide an advantage for athletes. Therefore, the present study aimed to compare the effect of sports vision training and quiet eye training on decision-making, gaze behavior, and learning tennis serves in novice tennis players.Methods: In this quasi-experimental research, which was conducted with a mixed design (within- and between- groups), 30 novice male tennis players from Khaneh-e-Isfahan complex, Isfahan City, with an age range between 20 to 30 years, were selected conveniently, and were assigned in two Quiet Eye training and Sports Vision training groups (15 people in each group). In the pre-test phase, the participants performed 12 tennis serves, and the participants' gaze behavior (quiet eye) was also measured during the trials. Also, the participants' tennis serve performances were recorded by a GoPro camera. Then, the experimental groups performed the determined training for eight weeks and three sessions per week and each session lasted for 30 minutes. After the end of 24 training sessions, the post-test phase was conducted. Two weeks after the last session, the retention phase was conducted. The obtained data were analyzed using the Mixed Model Analysis of Variance test.Results: The results showed that the quiet eye training resulted in better performance and learning of the tennis serve, a greater increase in the duration of the quiet eye period, and better decision-making compared to sports vision training (P<0.05).Conclusion: The results of this study emphasize the effectiveness of quiet eye training on motor and perceptual-cognitive skills compared to sports vision training.
Niloufar Zamani Fard; Daryoush Khajavi; Ahmad Ghotbi Varzaneh
Abstract
Introduction and Purpose: the current study was to examine the effect of quiet eye training on decision making, gaze behavior and tennis service skill learning.Methods: In this semi-experimental study, which was performed with a pre-test-post-test design with a 14-day follow-up period, ...
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Introduction and Purpose: the current study was to examine the effect of quiet eye training on decision making, gaze behavior and tennis service skill learning.Methods: In this semi-experimental study, which was performed with a pre-test-post-test design with a 14-day follow-up period, 30 novices male tennis players of Isfahan House with an age range of 20 to 30 were selected and those located in quiet eye training and control groups. In the pre-test phase, the participants performed 12 tennis services, which also measured the participants' gaze behavior during the operation. Participants' service was also recorded by GoPro camera to measure decision making. In addition, participants' performance was recorded by the researcher. Then, the experimental group performed the desired exercises for 8 weeks, 3 sessions per week and 30 minutes per session. During this period, the control group performed their daily activities. At the end of 24 practice sessions, the post-test phase, and two weeks after the last session, the retention phase was performed as the pre-test phase. Data were analyzed by repeated measures analysis of variance.Results: The results showed that quiet eye training have a significant effect on improving decision making, increasing the length of the quiet eye period and increasing the performance of the tennis service (P <0.05).Conclusion: The results of this study support the pre programming hypothesis that the importance of planning and choosing the correct answer.
Amir Shahavand; Khajavi Daryoush; Alireza Bahrami; Ahmad Ghotbi Varzaneh
Abstract
The purpose of current study was to muscle efficiency changes during successful and unsuccessful trials in elite pistol shooters with role of quiet eye meditation. In causal comparative study, 20 elite male pistol shooters selected for this study with age range 20-30 years old. After five trials familiarization, ...
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The purpose of current study was to muscle efficiency changes during successful and unsuccessful trials in elite pistol shooters with role of quiet eye meditation. In causal comparative study, 20 elite male pistol shooters selected for this study with age range 20-30 years old. After five trials familiarization, participants performed 20 trials to target with available standard. Scores of ten were considered successful, and scores of less than ten were considered unsuccessful. Data were analyzed using paired t-test and Bootstrap. The results indicated that there was significant difference between biceps and triceps muscle activity in successful and unsuccessful trials, and participants had lower muscle activity in successful trials than unsuccessful trials. Also, Bootstrap results revealed that the quiet eye period mediates biceps and triceps muscle activity in successful and unsuccessful trials. Overall, the results of current study confirmed postural stability hypothesis that this is the determining factor during this period is an increase in postural stability, which leads to a reduction in "noise" in the motor system.Shooting skills with high perceptual / cognitive requirements and low mobility needs and is one of the sports that is highly dependent on the performance of the visual system, because target identification and tracking is largely dependent on the performance of the visual system.In the present study, the researcher intends to investigate the muscular efficiency and mediating role of the length of the stationary eye period in the electrical activity of biceps and triceps of skilled pistol shooters in successful and unsuccessful attempts.
Mohammad Naderi; Alireza Bahrami; Darius Khajavi
Abstract
.The targeted 75 patients with a score of 45- 55 imagery and had no history of basketball free throw were selected and were divided in 5 groups, each of 15; control, mental imagery PETTLEP Constant, group mental imagery PETTLEP Constant combined with physical exercise Constant, group imagery PETTLEP ...
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.The targeted 75 patients with a score of 45- 55 imagery and had no history of basketball free throw were selected and were divided in 5 groups, each of 15; control, mental imagery PETTLEP Constant, group mental imagery PETTLEP Constant combined with physical exercise Constant, group imagery PETTLEP of the variable, group mental imagery PETTLEP variable combined with physical exercise variables. To collect data was used in the Movement Imagery Questionnaire – Revised (MIQ-R).At first of all groups were taken pre-test of basketball free throw. Exercise protocol, eight sessions were conducted for eight days. At the end, taken post-test. After Data normality and equality of variances, The result have been surveyed by analysis of variance, Tukey test and also the 16 version of SPSS in P value of P
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.
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.
Daryoush Khajavi; Ahmad Farrokhi; Ali Akbar Jaberi Moghadam; Anushiravan Kazemnejad
Abstract
The aim of this research was to examine the effect of a training interventionprogram on fall-related motor performance in the male elderly with no regularphysical activities. For this purpose, 39 out of 130 participants in screen test wereselected and assigned to training group (n=20) and control group ...
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The aim of this research was to examine the effect of a training interventionprogram on fall-related motor performance in the male elderly with no regularphysical activities. For this purpose, 39 out of 130 participants in screen test wereselected and assigned to training group (n=20) and control group (n=19). Subjectsaged between 60 and 70 in experimental were 73.68% and in the control group43.75% and subjects aged 71 and above were 26.31% in the experimental groupand 56.25% in the control group. Experimental group participated in a 10-weekintervention program (3 sessions per week and 90 minutes per session). Data werecollected with 30-s seat, sit and reach, one-leg standing (eyes open and closed), upand go, 10-meter walk and 10-meter obstacle walk tests. In this semi-experimentalresearch, Kolmogorov-Smirnov and independent t test was used to analyse motorperformance measures. Results indicated a significant improve in mean scores oflower extremity strength (27.37 rep), flexibility (29.28 cm), static balance with eyesopen (60.94 sec) and closed (19.36 sec), agility and dynamic balance (4.10 sec),10-meter walk (3.35 sec) and 10-meter obstacle walk (4.03 sec) in the experimentalgroup after the 10-week training intervention program (P<0.05). The findingsconfirmed the effect of training interventions (especially strength training) onimproving fall-related motor performance and preventing probable falls in theelderly.
