Fatemeh Keshvari; Alireza Farsi; Behrooz Abdoli
Abstract
Introduction: This study aimed to investigate alpha power in successful and unsuccessful free throws of elite and novice basketball players.Methods: The current research was quasi-experimental and was implemented in a time series design. Two Elite (10 participants with a mean age of 22.25 ± ...
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Introduction: This study aimed to investigate alpha power in successful and unsuccessful free throws of elite and novice basketball players.Methods: The current research was quasi-experimental and was implemented in a time series design. Two Elite (10 participants with a mean age of 22.25 ± 1.34) and Novice (10 participants with a mean age of 22.55 ± 1.80) groups participated voluntarily. The data were measured using 28 electrodes from a 32-channel wireless device and were analyzed using the repeated measures analysis of variance test (p≥0.05).Results: The alpha power of the elite group was higher than the novice group (P=0.001). The successful throws showed lower alpha power than unsuccessful throws (P=0.006). In the comparison of the two groups, the alpha power in the unsuccessful throws of the elite group was higher than in their successful throws (p=0.001), but no difference was observed between the alpha power of the successful and unsuccessful throws of the novice group (p=0.584). The alpha power during the execution time of the free throw task was higher than the pre-execution time (p<0.005), but there was no difference between the first and second pre-execution times (p=1.000). The results of the present study showed that the elite group had higher cortical activity than the novice group in all electrodes (p<0.001).Conclusion: The findings show that the elite group performed the task with less cortical complexity by inhibiting irrelevant information. In addition, the decrease in alpha power in successful throws indicates an increase in activation of cerebral cortex and an increase in concentration, so that the task can be performed with fewer neural resources.
Hadis Kavianipoor; Alireza Farsi; Alireza Bahrami
Abstract
Introduction: The present study aimed to develop a model of the relationship between trait anxiety and the components of attentional styles in athlete students.Methods: The current research strategy was descriptive and correlational, with the approach of developing a correlational model. In three stages, ...
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Introduction: The present study aimed to develop a model of the relationship between trait anxiety and the components of attentional styles in athlete students.Methods: The current research strategy was descriptive and correlational, with the approach of developing a correlational model. In three stages, the attentional styles questionnaire was translated into Persian and was evaluated psychometrically. Its process consisted of the French version translation into Persian, re-translation into French, and the final translation. In this study, 245 athletes were selected conveniently from the student population of Shahid Beheshti University. Participants completed attentional styles and trait anxiety questionnaires. Data were analyzed using Confirmatory Factor Analysis, Cronbach's alpha coefficient, and Structural Equation Modeling (SEM).Results: Cronbach's alpha coefficient for two factors of top-down and bottom-up attention was 0.70 and 0.72, respectively. The confirmatory factor analysis results showed that the factor loadings of five items (items 2 and 4 of the top-down attention factor, and items 3, 8, and 9 of the bottom-up attention factor) were less than 0.4, so they were removed. SEM results showed that trait anxiety has an inverse and significant relationship with top-down attention and a direct and significant relationship with bottom-up attention. Conclusion: The results of the present study highlighted the importance and necessity of paying attention to the relationship between trait anxiety and the components of attentional styles in athletes. Therefore, in planning training programs and improving sports performance, taking this relationship into account can be an effective step in preventing adverse outcomes in sports competitions.
Ebrahim Moteshareie; Behrouz Abdoli; Seyed Mohammad Kazem Vaez Mousavi; Alireza Farsi
Abstract
The aim of this study was to evaluate the effect of PST on performance, retention, and transfer under pressure of novice badminton players. 40 novice badminton players were randomly assigned to experimental (20 participants) and placebo-control (20 participants) groups. In acquisition and retention tests, ...
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The aim of this study was to evaluate the effect of PST on performance, retention, and transfer under pressure of novice badminton players. 40 novice badminton players were randomly assigned to experimental (20 participants) and placebo-control (20 participants) groups. In acquisition and retention tests, short and long service, toss clear and drop shots were used; in transfer under pressure test, notational analysis was applied. All participants acquired specific badminton skills in 24 sessions over three months. In addition to specific badminton skills, the experimental group received the specific package of PST during 24 sessions (each session 20 min.) while placebo-control group received the same number of sessions about general information on badminton. The results of mixed ANOVA indicated that in all tests, the scores of experimental group were significantly higher than those of the placebo-control group, which indicated the effectiveness of PST on performance and learning of novice male badminton players. The results of this study extended the effectiveness of PST to learning new motor skills.
Ali Farsi; Hadis Kavianpoor
Abstract
The purpose of present study was to determine the effect of different levels of balance task difficulty and visual feedback on balance in elderly women. Fourteen healthy elderly women (mean age 57/65 yr) were selected voluntarily. Participants were asked to stand still on a stability platform under each ...
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The purpose of present study was to determine the effect of different levels of balance task difficulty and visual feedback on balance in elderly women. Fourteen healthy elderly women (mean age 57/65 yr) were selected voluntarily. Participants were asked to stand still on a stability platform under each of two conditions (with visual feedback and without visual feedback) in three levels of difficulty (6, 8, 10). Stability index scores (Overall, Anterior- Posterior and Medial- Lateral) were calculated by Biodex Balance System. Duration of each test was 20 seconds and rest times were 20 seconds. Results showed that with increasing task difficulty, score of Medial- Lateral balance (p= 0/02) increased significantly. In addition, There was a significant reduction in the scores of Overall balance (p= 0/001), anterior - posterior balance (p= 0/01) and medial - lateral balance (p= 0/01) in visual feedback condition compared with without feedback condition. Overall, the results of this study showed that increasing task difficulty increases postural sway and availability of visual feedback can improve balance and reduce the postural sway.
Alireza Farsi; Behrooz Abdoli; Maryam Kaviyani
Volume 3, Issue 1 , June 2011, , Pages 43-55
Abstract
The aim of this study was to compare the effects of cognitive-attentional and cognitive-motor load on the performance of bimanual coordination skill. 31 female students (mean age 25+2 years) from Shahid Beheshti University attending were selected voluntarily and divided randomly into three groups: single ...
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The aim of this study was to compare the effects of cognitive-attentional and cognitive-motor load on the performance of bimanual coordination skill. 31 female students (mean age 25+2 years) from Shahid Beheshti University attending were selected voluntarily and divided randomly into three groups: single group (N=11), cognitive group (N=10) and cognitive-motor group (N=10). Single group participants performed bimanual coordination single task. Cognitive group participants performed bimanual coordination task simultaneously with number countdown task, and cognitive – motor participants performed bimanual coordination task simultaneously with feet reaction time task. Two hand coordination of Vienna test system was used to assess the performance of bimanual coordination task. One – way ANOVA and Tukey post hoc test were used to analyze data. Statistical significance level was p
Mohammad ali Aslankhani; Alireza Farsi; Hojjat Zamani; Zahra Fathi
Volume 2, Issue 3 , October 2010
Abstract
The present study aimed to examine the effect of contextual interference on acquisition, retention and transfer of coincidence anticipation task with constant, increasing and decreasing speeds. 36 male physical education participants from Shahid Beheshti University were voluntarily selected and randomly ...
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The present study aimed to examine the effect of contextual interference on acquisition, retention and transfer of coincidence anticipation task with constant, increasing and decreasing speeds. 36 male physical education participants from Shahid Beheshti University were voluntarily selected and randomly divided into three groups (12 subjects each group) and performed coincidence timing tasks with Bassin anticipation timing. In this research, three separate experiments were used. Experiments consisted of constant speed, increasing speed and decreasing speed. Subjects participated in pretest, acquisition, blocked retention, random retention and transfer tests. Absolute temporal errors were analyzed by one-way ANOVA, ANOVA with repeated measures and Bonferroni post hoc tests (P
Alireza Farsi; Behroz Abdoli; Maryam Kaviani; Akram Kaviani
Volume 2, Issue 2 , July 2010
Abstract
The purpose of this study was to investigate the effect of perceptual – motor experience on motor development quotient of fine and gross motor skills in infants. Fifteen 5-8-month-old healthy infants participated randomly in this study and were divided homogenously into two groups (experimental and ...
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The purpose of this study was to investigate the effect of perceptual – motor experience on motor development quotient of fine and gross motor skills in infants. Fifteen 5-8-month-old healthy infants participated randomly in this study and were divided homogenously into two groups (experimental and control) according to their age. Experimental group had 36 training sessions, each session an hour at a perceptual – motor enriched environment. Peabody motor development scale was used to evaluate fine and gross motor skills. Data were analyzed by independent t test. Results indicated a significant difference in mean score of motor development quotient between fine motor skills (p=0.004) and gross motor skills (p=0.02). These findings showed that training and experience had a positive effect on motor development generally and on motor development quotient of fine and gross motor skills specifically. In other words, training and experience were positive factors of fundamental and basic motor skills development of the infants in both groups. These results are in line with the perspective of dynamic systems of motor development.