جستجوی مقالات مرتبط با کلیدواژه « bilateral transfer » در نشریات گروه « تربیت بدنی »

Purpose and Research field:

 Investigating bilateral transfer has drawn considerable attention among researchers studying motor control for a long time. However, the fact that bilateral transfer can also be seen in a reaction time task is an issue that has not been addressed. Therefore, the current study aimed to investigate the bilateral transfer in a choice reaction time (CRT) task.

The present research was a semi-experimental study with a pretest-posttest design and a control group. Participants were randomly divided into three groups of 15 individuals (training by hands, training by legs, and control groups). Participants in the experimental groups practiced the choice reaction time task in three sessions (during a week), and each session consisted of three blocks of 25 trials. To evaluate CRT, the RT-888 device was used. The Edinburgh questionnaire was also utilized to determine the participants’ dominant hands and legs. Data were analyzed using an independent samples t-test and multivariate analysis of variance at a significance level of p < 0.05.

The results showed a significant difference between the experimental and the control groups. The groups training with hands (hands P = 0/001, legs P = 0/001) and legs (hands P = 0/001, legs P = 0/005) showed significantly shorter CRTs compared to the control group. Moreover, the CRT significantly decreased in the post-test in both experimental groups.

The effect of practice on reaction time could transfer through limbs, despite their anatomical differences.

Nowadays,universities are known as the main context of thinking and contemplation and students have an essential role in the development of the society.Therefore,factors affecting educational and researchperformance are of great importance.The aim of the present study was to investigate the effect of PETTLEP imagery on bilateral transfer of handball skill.The Sample included B.Sc students in physical education at the University ofTehran,24of which participated in thisresearch voluntarily.After taking part in the pretest, the participants were randomly divided into2groups of imagery with dominant hand and non-dominant hand.Then PETTLEP imagery was applied on both groups for12sessions.A posttest similar to the pretest was done after the last session.This was followed by aretention test after24hours and then a transfer test in the form of handball tripleshootafter30minutes.After ensuring the consistency of variances by Leven test and normality of the data by Shapiro-Wilk test,a multivariate analysis of variance(MANOVA)and an analysis of variance with repeated measures with asignificant level of α=.05 were used.The results showed that intervention of PETTLEP imagery hada significant effect on skill transfer through the entire process(P≥.05).Thus,PETTLEP imagery causes the occurrence of bilateral transfer.Therefore,PEETLEP mental imagery is recommended to be used for the improvement of people's skill when employing bilateral transfer.Therefore,PEETLEP mental imagery is recommended to be used for the improvement of people's skill when employing bilateral transfer.Therefore,PEETLEP mental imagery is recommended to be used for the improvement of people's skill when employing bilateral transfer.

The purpose of this study was to survey the symmetry in bilateral transfer of cognitive and motor components in soccer kicking skills of the male students at Ferdowsi University of Mashhad. The subjects were 64 participated students of General Physical Education 1 course، with an age range of 18 to 24 years، that did not have any professional and regular experiences in soccer، and their dominant leg was right. They were randomly and equally assigned to four groups. The task of inside kicking was performed with the emphasis on accuracy cognitive component in Group A (practice with dominant leg) and Group B (practice with non-dominant leg) and the task of instep kicking was performed with the emphasis on force motor component in Group C (practice with dominant leg) and Group D (practice with non-dominant leg) for 8 weeks، 3 times a week and 150 trials per session. Results showed that the practice has been caused transferring the cognitive component from the dominant leg to the non-dominant leg and vice versa (P<0. 05)، and that the transfer of the component was symmetric. But the motor component has only been transferred from the dominant leg to the non-dominant leg (P<0. 05)، and the transfer of the component was asymmetric and this asymmetry was in favor of the dominant leg. Based on the results، it is better that we practice with both legs in the skills with high cognitive component، and practice with the dominant leg in skills with high motor component.

The purpose of the present study was to determine the effects of two types of resistance exercise training (isotonic and isometric) on bilateral transfer effect (cross education). Subjects (n=40، untrained for least 6 months) were randomly assigned to a control group or one of the two groups of resistance training that trained their knee extensor muscles unilaterally. Training was 3 times/wk for 6 wk with three sets of 6-8 repetition (2 minutes rest interval) maximum at 80% one repetition maximum (1RM) for isotonic group and for isometric group، resistance training program was 30 isometric extension maximal voluntary contraction (MVC) for 2-4 second with 15 second rest between each contraction. Control subjects attended sessions but did not exercise. Knee extensor strength was measured with two tests (1RM and MVC) before and after training. Integrated electromyography (IEMG) also was measured. Unilateral isotonic and isometric resistance training significantly (p≤0. 05) increased 1RM، MVC and IEMG in the trained and contra lateral untrained limbs، but no significant changes occurred in any variables in the control group. Results of IEMG changes، only showed significant differences between isotonic and control groups. In the view of the resistance exercise intensity and rate of cross education in each groups، it seems isotonic resistance exercise training may be useful than isometric type in rehabilitation program.

This study was conducted to compare the amount of immediate and delayed bilateral transfer in throwing skills of children and adults. It covers three main elements of age range, time scale and the type of hand.

Forty female children (7-8 years) and adults (18-19 years) were participated in an over head throwing skills similar to basketball hook shot. The experiment included: the preparation phase, pre-test, exercise phase, and post-test consisting of one immediate transfer test -10 minutes after the exercise phase- and one delayed transfer test -24 hours after the exercise phase. The findings of the research were analyzed using descriptive statistics (mean & standard deviation) and mixed analysis of covariance with repeated measures, two-way analysis of variance, one-way analysis of variance and dependant t-test.

The results indicated no significant differences in the amount of immediate and delayed bilateral transfer between children and adults (P>0.05). Also, in two age groups, the transfer from non-preferred hand to the preferred hand was greater (P<0.05). No specific difference in immediate and delayed bilateral transfer was observed. Therefore, time didnt show changes in the amount of transfer.

These results have been discussed according to the existing literature and researches.