نشریه رشد و یادگیری حرکتی - ورزشی
پیاپی 41 (پاییز 1399)

Scholars believe that if a society encourages its people to do physical exercise, in fact, it has contributed to its own self-esteem and physical and spiritual health as well .The aim of the present study was to investigate validity and reliability of Persian version of Sport Motivation Scale (SMS-6). This was a descriptive- correlational research whose statistical population consisted of all students of Tehran University included 241 students (132 men and 109 women) with 18 to 30 years old. The measurement tool of the research was Sport Motivation Scale (SMS-6) included six subscales and 24 questionnaires. This scale follows Self-Determination Theory that in one spectrum from amotivation to intrinsic motivation determines the type of sport motivation of a person which includes the following subscales namely amotivation, extrinsic regulation, identified regulation, self-determined regulation, mixed regulation, and intrinsic regulation. Test-retest method was applied in order to calculate the stability and Cronbach’s Alpha was used for determining internal consistency, and for establishing the validity and reliability of the construct, Confirmatory Factor Analysis, exploratory Factor Analysis and Pearson correlation test were applied, respectively. The result showed that Persian version of sport motivation scale provided support structure of original form and validity and reliability were confirmed. According to results, Persian version of Sport Motivation Scale (SMS-6) has acceptable validity and reliability and suggested to evaluate motivation in sport settings. In fact people motivational factors can be indicated by researchers to find best way for increasing rate of participation in physical activity settings.

The purpose of this investigation was to examine the anticipation of taekwondo athletes when facing right- and left-footed kicks. Expert taekwondo athletes (n = 40; age = 20.935.12 years; Taekwondo Kyorugi competition experience = 7.584.49years) were shown identical video simulations of right-footed and left-footed chagi kicks. The videos were temporally paused at five different time occlusion points from the start to the end of the kicks. The participants were required to make prediction of kick types (front vs. back leg to head or trunk of opponent in kick attacks). The results indicated that anticipation of right-footed kicks was significantly more accurate than that of left-footed kicks. The footedness effect was found to be most pronounced when kicks videos were paused at 120 ms prior to the kick completion. Thus, the opponent’s footedness seems to affect visual anticipation of the type of an action. Mean percentages of correct predictions suggest that kyorugi taekwondo players may not adopt an optimal visual search strategy when facing left-footed kicks, resulting in fails in the detection of anticipation-relevant kinematic cues before the end of left-footed kicks in most instances (i.e., about 120 ms and more before the kick completion). It seems that the lower ability of recognizing the type of left- vs. right-footed opponents' kicks were due to the observers’ reduced perceptual awareness with left-footed actions

The Effect of transcranial direct current stimulation (tDCS) has been studied in descriptive and laboratory tasks in the field of motor and sport skills. It is necessary that tDCS effects on real sport skills are investigated. The aim of the current study was to examine the Effect of tDCS on performance of basketball two point field throws (BFT) in skilled basketball players. In this quasi- experimental study, we used a repeated measure design including a pretest, intervention, posttest and follow. A total of 26 male basketball players were randomly divided into either an experimental or a sham group. Both groups watched the point light model of the performance of two elite basketball players. Then, the participants of the exercise group received tDCS over their pre-motor cortex for 20 minutes. The participants of the sham group underwent identical tasks performance except that tDCS was artificially applied for them. BFT was assessed at baseline (pre-intervention), one day post-intervention and 7 days post-intervention. For analyzing data, two factor Mixed model ANOVA, independent and paired t-tests were used. Results showed that anodal tDCS created no between group's differences in BFT in the intervention phase while tDCS lead to significant improvement of BFT in experimental group skills compared to sham group in test phase. Results showed that tDCS could be considered as a useful intervention for the improvement of BFT in skilled basketball players.

Numerous studies have examined the effects of focus of attention and quiet eye on motor performance, however the effects of these two variables in different load of task are ambiguous. Therefore, the purpose of the present study was to investigate the effect of the internal and external focus of attention instructions on quiet eye and accuracy of dart-throwing in two intensity of the secondary task. participants were 20 novice persons in dart-throwing that selected by convenience sampling; and in four dual-task conditions of internal attention-without tone estimation, external attention-without tone estimation, internal attention-with tone estimation, and external attention-with tone estimation performed dart throwing in counterbalance form that at the same time their gaze data recorded by binoculars eye tracking system. The result of accuracy showed that participants in external rather than internal attention condition and low- intensity rather than high-intensity condition had less radial error. The result of quiet eye showed that only the main effect of the secondary task was significant that participants in high-intensity of the secondary task rather low had more quiet eye duration. These results highlight the importance of external focus of attention in low and high secondary task load conditions for dart-throwing performance and direct the future research to explore more deeply the role of the quiet eye and attentional focus effects in dart-throwing performance.

The aim of this study was to investigate the effect of a selected balance training program under dual and single-task conditions on working memory of children with developmental coordination disorder. The research method was semi-experimental and a pre-test-post-test- follow-up design with a control group. In this study, 39 boys with DCD were selected by the available sampling method and randomly assigned to three groups: Dual-task training (n=13), single-task training (n=13), and control (n=13). The two experimental groups performed a selected training program with two different conditions for 8 weeks. All subjects were evaluated in three stages of pre-test, post-test and follow-up test (two months after post-test) by the Corsi block-tapping test (working memory test). Data analysis using ANOVA with the repeated measure as well as one-way ANCOVA showed that in the post-test, working memory in dual-task group was superior to both single and control groups (P <0.05). Also, a significant difference was observed from pre-test to post-test in all experimental groups except the single task group in the extended block index and the control group. In the follow-up test, this superior was maintained only in the overall score index and the overall effort. Also, the single-task group was superior to the control group in the post-test (P <0.05). Due to the importance of executive function, using this selected exercise program to improve working memory can be a useful tool and is suggested for this group of children.

Exercise and physical activity have positive effects on physical and mental performance, but their effect on cognitive function needs to be explained in more detail. This study examined the effect of selected physical activities with different levels of cognitive-motor interaction on the executive functions of 76 girls aged 10 to 12 years in Bam city, with mean and standard deviation of body mass index of 18.5 1 1.5 and average intelligence of 10.5 9 9.9. Based on the pre-test score, they were randomly divided into four groups (high cognitive-high motor, low cognitive-high motor, high cognitive-low motor and low cognitive-low motor). The results of covariance analysis showed that high cognitive-motor lifting exercises have a positive effect on attention and memory function of executive functions of 10 to 12-year-old girls and low cognitive-high-motor and low-cognitive-high-motor cognitive exercises have a positive effect on attentional and inhibitory components. There was a significant difference between high-motor, high-motor, low-motor, low-cognitive, high-motor, and low-cognitive-motor cognitive exercises in the attention component, but no significant difference was found in the component of working memory and inhibition. Therefore, based on the results of this research, by designing high-mobility cognitive exercises in the educational environment, it is possible to provide improvement of executive functions. Therefore, it is hoped that researchers will use the results of this research to improve the executive functions of children .

The use of attention instructions type is one of the most important variables in the process of motor skill learning. The aim of this study was to examine the combined effects of attention instruction type feedback, and autonomy on children's motor learning. For this purpose thirty-six children (M±SD 7.05 ± 0.45 years) were asked to perform a bowling task with their dominant hand. They divided into 3 groups (external focus, the internal focus of attention, and control). Participants in the acquisition phase practiced tasks in a counterbalanced order based on feedback and choice (Autonomy) conditions and after 24 hours they take part in retention test without feedback and instructional attention and autonomy .The acquisition phase in each condition(1-without feedback and autonomy,2-with feedback,3- with autonomy,4-with feedback, and autonomy). The data were analyzed by ANOVA and ANCOVA. The results of the retention phase showed that the type of attention focus without feedback and autonomy had a greater bowling accuracy and the external focus of attention with autonomy was better than other conditions. The present study did not show the beneficial effects of attention instruction type feedback, and autonomy on children's motor learning.The results showed that motor learning in children was different from adults.Based on our results in children external attention focus and feedback with autonomy have not similar effects with adult motor learning.

The purpose of this study was to investigate the effect of eight weeks of mirror training on balance in patients with subacute stroke. The statistical population included subacute stroke patients referring to Tabassom stroke rehabilitation clinic in Tehran. The sample consisted of 30 subacute patients with inclusion criteria who participated in the study with their consent and volunteering. The Samples were randomly divided into experimental and control of mirror training. Both groups participated in the pre-test and intermediate test, which was performed after four weeks and post-test of Berg Balance Scale after eight weeks. The training program of two groups was the same and included eight weeks, each week, two sessions, each session 90 minutes Consist 60 minutes of normal rehabilitation and 30 minutes of training with mirror in experimental group and without mirror in control group. Data were analyzed by mixed analysis variance (2 * 3) with SPSS23 software. The results showed that all three factors of balance (p = 0.001), group (p = 0.001) and balance and group interaction (p=0.008) had significant effect. Balance was significantly different in all three stages of pre, mid and post-tests (P=0.001). The interactive effect of balance and group in the two experimental and control groups was significantly different between the three stages test (P = 0.001). Overall, mirror training improved the balance of patients with subacute stroke. Therefore, it is recommended to using a mirror training in the subacute stroke patient.