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The purpose of current study was to consider a course of doing psychological skills training (PST) program on chosen mental skills and the performance of teenager female taekwondo athletes with mean age 16 years of Iranian national team in 2009. The current study is in tentative type and pre and post test design with control group. To do this 22 people (female) among invited people to the camp of taekwondo national team in teenager level for participation in Asian competition of Kish were randomized and then were separated into two groups of control (10) and experimental(12). Then both of them completed the OMSAT-3 questionnaires in pre-test stage, so that to be evaluated from the view of mental skills and making check list for performance evaluation. According to gained results of questionnaires in pre-test stage and based on subjects weakness in skills of reaction to stress, fear controlling and concentration, an exercise package of purposing, goal setting, relaxation and imagery was used as PST program. After 4 months PST program of both groups was performed. Collected data was considered by independent statistical t-test. The results of this study showed that there is a significant difference between control and experimental groups in skills of reaction to stress and concentration after doing a course of PST program (P < 0.05). But there was no significant difference between these two groups in skill of fear controlling (P > 0.05). At last the results showed that there is a significant difference between control and experimental groups in performance after doing a course of PST program (P < 0.05). 

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The aim of this study was to investigate simultaneous changes in EMG pattern during learning dart skill in dominant and non-dominant hands. The samples consisted of 10 non-athlete students with an average age of 23±2.5, which were divided into two group dominant hand (5) and non-dominant hand (5). Repeated measures ANOVA were used to measure data at the execution level and changes in EMG activity. The results showed a significant decrease in the absolute error of dart throwing at the performance level and an increase in EMG activity at the muscle level along with a decrease in muscle co-contraction in the acquisition and retention stages in both groups (P<.05). Also, there was no significant difference between EMG activity in the dominant and non-dominant hand groups after skill acquisition (P>.05). Generally, the results of this study showed that along with relatively constant changes in performance during dart skill learning, relatively constant changes in EMG patterns also occur, so that the concept of motor learning is also observed at the muscle level. Also, the results of this study supported the existence of the same motor program for dominant and non-dominant hand control, even in the conditions of bilateral transfer control.