نشریه رشد و یادگیری حرکتی - ورزشی
پیاپی 27 (بهار 1396)

Dyad training is a method in which pair groups participate in learning motor skills and it seems that it could be characterized as an optimal instructional environment through enhancing effectiveness and efficiency of training conditions. The aim of the present study was to examine the effect of dyad training on learning front crawl swimming. Twenty 7-10-year-old boys were assigned to two groups of dyad and individual training (each group 10 subjects). After receiving instructions and observing the perfect skill, subjects were paired; one half entered the water to perform the required skill and the other half stayed outside and like a coach gave his partner a feedback on his performance after observing his trial. After some trials, they exchanged their roles. However, after receiving instructions and observing the perfect model, all children in individual group entered the water and simultaneously performed the required skill. In the retention test, each child’s 10 m swimming was filmed and these clips were evaluated by 2 federation coaches using front crawl swimming checklist. The inter class correlation coefficient was 0.90. The results of retention test showed a significant difference between dyad and individual groups (P

The main aim of the present study was to investigate the effect of Swiss ball training on the improvement of sensorimotor function in three boys with autism. In the present study, a single-subject method was used. Three autistic participants were required to exercise with Swiss ball for 9 weeks. Changes in the scores of the sensorimotor function subtest were measured by NEPSY neuropsychological test during the intervention and two weeks after the intervention in one-week intervals. The subjects took the test again after two months. The results showed that the intervention considerably improved sensorimotor function of the three participants (PND=100% for the first participant and 77.78% for the second and the third participants). This reduction was found to be maintained two weeks after the intervention. These findings showed that Swiss ball training considerably improved sensorimotor function in boys with autism.

Challenge point framework is a theoretical framework to understand the effects of exercise variables in motor learning. According to this framework, contextual interference and knowledge of results (KR) feedback have a close relationship with the skill level and task difficulty. So, the aim of this study was to investigate the effect of exercises based on challenge point framework on postural control in patients with multiple sclerosis. The postural control of 22 MS patients (age range 20 - 65 years) from patients of Ahvaz MS Association who were randomly selected and assigned to experimental and control groups was measured by the force platform. Subjects in the experimental group performed exercise for 12 sessions, 3 sessions per week and 45 minutes each session. The control group did not receive any interventions. The data were analyzed by mixed analysis of variance and analysis of variance with repeated measures (P≥0.05). The findings showed that the postural control of experimental group significantly improved compared with the control group as a result of four weeks of exercise protocol. Also, postural control of the experimental group significantly developed in the posttest compared with the pretest. So this study supported challenge point framework and instructors and practitioners can use this protocol for effective clinical interventions to improve balance and postural sways in MS patients.

The present study investigated the prediction of the effect and contribution of developmental and skills factors related to talent identification before football education on 10-12-year-old adolescents’ skill performance after 8 educational sessions. The statistical population inclued all certified football schools in Isfshan city and finally 16 schools cooperated with the researcher. The sample included 171 male adolescents (mean±SD: age 11.01±0.79 year, height 141±7.8 cm, weight 34.03 ±7.5 kg) and 4 subjects were selected from each age group of each football school by simple random sampling method. The participant's skill performance including running with the ball, turning with the ball, dribbling and speed of running were assessed by football talent identification tests derived from the Football Association of England before and after 8 sessions of football education. Reliability of these tests were 90% and their validity was 85%. Descriptive statistics and multivariate stepwise regression analysis were used in this study. Data analysis revealed 4 models to predict adolescents’ skill performance after 8 sessions of football education according to the pretests. Finally, the perfect model predicted 59.4% of variability of the critria.

The aim of this study was to investigate the effect of 10 weeks of shadow play on preschool children's fundamental movement skills. In this quasi-experimental study with pretest/posttest design and a control group, 28 girls and boys (6 years old) were selected by convenience sampling method from children in a preschool and were randomly divided into the experimental group (5 girls & 9 boys) and the control group (5 girls & 9 boys). For 10 weeks (three 45-minute sessions), the experimental group performed the shadow play and the control group had their routine activities of preschool. The pretest and the posttest were administered by "the Movement Assessment Battery for Children-Test (M-ABC)". This test consisted of three subtests of manual dexterity, ball skills and balance skills. Analysis of data was performed by covariance analysis (α=0.05). The results showed that 10 weeks of shadow play had a significant effect on subtests of manual dexterity, balance skills and the total score of fundamental skills but had no significant effects on ball skills. Findings of this study showed that shadow play may improve preschool children's fundamental movement skills.

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.

This study aimed at investigating the effect of sleep deprivation and retroactive interference on offline learning in tennis simulated game. Based on the questionnaires related to the variables under study, 50 female students of Semnan University (age range 19-25 years) were selected as the sample and divided into 5 groups: perfect sleep, sleep deprivation, perfect sleep and retroactive interference, sleep deprivation and retroactive intervention and training with rest interval less than 1 hour. A tennis simulated game (with rules and scoring similar to a real game) was performed to measure offline learning. One-way ANOVA and ANOVA with repeated measures were used for inferential statistics at a significance level (P≤0.05). The results showed that the differences in offline learning (Sig=0.001) and retention scores (Sig=0.001) were significant among the research groups. In those groups with sufficient rest intervals between each two sessions and full rest, the level of their performance was higher in the next day than the previous day. Opposite effects were observed with sleep deprivation and retroactive interference. Therefore, those who are learning a skill should pay attention to their daily activities and sleep patterns to prevent a disruption to skill learning and to take advantage of their practices.

The aim of this study was to investigate the effect of central and peripheral fatigue on motor coordination in collegiate athletes. The population consisted of all the students of Faculty of Physical Education and Sports Sciences of University of Tehran and 24 subjects were selected by convenience sampling method. They were randomly divided into two groups (central and peripheral fatigue) depending on the type of fatigue after a bimanual motor coordination pretest. Bimanual motor coordination posttest was performed after the intervention for 12 hours. In order to investigate the differences between the groups, independent t test and to determine differences within a group, dependent t test were used with the significance level of P≤0.05. Results showed that the mean time to complete the task and the timing error in central (P=0.004) and peripheral (P=0.0001) fatigue groups significantly increased compared with the pretest. Also, a significant difference in bimanual motor coordination between the two groups was observed in posttest (P=0.006). According to the results, it is suggested that athlete's training and working programs should be planned so that they include exercises to increase mental stamina along with physical exercises and that the athletes can provide their optimal performance in different conditions.

.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

The aim of this study was to evaluate the effectiveness of "FOOTBALISTHA" animation to attract children to football. Animation, as a tool for multimedia education, can show longitudinal changes of events such as move, process and procedures and it can affect children’s absorption. The population of the study consisted of all male primary school students (fourth to sixth grade) in Amol city (N=15000). 500 students were selected by cluster random sampling method. A researcher-made questionnaire was used for data collection. The face validity was confirmed by professors and construct validity and reliability (0.91) were assessed as suitable. Descriptive statistics, confirmatory factor analysis, Kolmogorov-Smirnov, binominal and Friedman tests were used with SPSS22 and Amos18. The findings showed that "FOOTBALISTHA" animation was effective in children’ attention to football, their interest in football and their tendency to football and finally playing football. So "FOOTBALISTHA" animation had sufficient effectiveness in changing children's sport behavior and the findings of this study were consistent with AIDA model.