جستجوی مقالات مرتبط با کلیدواژه "پرتاب آزاد" در نشریات گروه "تربیت بدنی"

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 free throws (BFT) in skilled basketball players. In this quasi- experimental study, a repeated measure design including a pretest, intervention, posttest and follow up was used. 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 elite basketball players. Following the observation of point light model, participants of the exercise group received tDCS over their pre-motor cortex for 20 minutes prior to tasks performance. 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), intervention and 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 improvement of BFT in skilled basketball players.

The present study was conducted to compare the effectiveness of two different methods to enhance free throw shooting among young basketball players. One method is based on mindfulness(MSPE) and the other is based on mental imagery(MI). This is a semi-experimental study and in terms of data collection, the design of the study is experimental with pre-test, post-test and a control group. Statistical population consisted of young basketball players in Tehran from whom 60 players were selected through convenience sampling and put into the following three groups: mindfulness group, mental imagery group and control group. Statistical analyses were presented in two sections: descriptive statistics and inferential statistics. Descriptive statistics included participants’ characteristics, distribution of data and the variables’ mean and standard deviation. Shapiro-Wilk test was also used to determine whether the data were naturally occurring. Then, the data were analyzed through inferential statistics using paired-samples T-Test, ANOVA, Leven’s Test, Games-Howell Test and Bonferroni post hoc Test to test the hypotheses. Significance level of the study was set at 0.05. The results obtained from the pre-test and post-test of both mindfulness and mental imagery groups showed the participants’ performance was significant with mean differences of 4.15 and -2.55 respectively. Also, the final findings of the study indicated that treatment in mindfulness group was more effective than that of mental imagery group, in improving free throw shooting (P=0.2).

Various researches know lateral preference of eye and hand pattern as one of the important factors of performing sports skills. This study aimed at investigating the effect of lateral preference of eye and hand pattern on learning basketball free throw skill. From 3000 female students of Shahid Chamran University of Ahvaz, 60 subjects (age range 19-22 yr) were selected purposively as the sample using a researcher-made questionnaire of individual information and sporting background, Edinburgh Handedness Inventory (Oldfield, 1971) and hole card (Durand and Gold, 1910) and were assigned to two control and experimental groups (each group: 15 unilateral subjects and 15 crossed-lateral subjects). Firstly, pretest of basketball free throw was conducted. Then, practice protocol was performed for 8 weeks (24 sessions, 3 sessions a week). During this period, 6 posttests were administered to determine learning stages and one week after the last posttest, the retention test was conducted. The results showed a significant difference between unilateral and crossed-lateral (experimental group) subjects in the cognitive (sig=0.000) and associative (sig=0.000) stages of the acquisition of basketball free throw and the unilateral subjects had a better performance. Whereas there was no significant difference between unilateral and crossed-lateral subjects in the autonomous (sig=0.105) and retention (sig=0.086) stages. Finally, the results showed a difference in performance between experimental and control groups in favor of experimental group. According to these results, it seems that long practice and autonomous skill in unilateral and crossed-lateral subjects matched their performance and eliminated their differences. Therefore, coaches are recommended to identify talented subjects after a lot of practice in order to not generalize the result of performance to learning.