جستجوی مقالات مرتبط با کلیدواژه "تکلیف پیگردی" در نشریات گروه "تربیت بدنی"

Peripheral visual perception is a concept of cognitive-perceptual processes, which, although it is referred to in the ballfields, has not yet been studied in the non-ballfields and the examination of gender differences is also a challenge to be addressed. So, the purpose of this study was to examine the peripheral visual perception of ballplayers and non-ballplayers. The samples of this study were randomly selected from the young girls and boys (average and standard deviation 26±4.5 age) in ball fields (14) and non-ball fields (16) of the Faculty of Physical Education of the University of Tehran. All subjects had complete visual acuity and the consent form of the research. The instrument of Vienna was used to measure peripheral visual. The statistical results of MANOVA test showed that there is no significant difference in the peripheral visual perception between ballplayers and non-ballplayers in girls and boys (P≤0.05). In general, this research showed that the type of exercise (ball and non-ball) and gender cannot be a factor in the superiority of peripheral perception, and although the importance of peripheral perceptual skill in ball exercises has been shown in research, this skill is also very important in non-ball exercises.

In the present study the software of motor performance assessment in pursuit tasks is presented with ability to calculate root mean square error as an important measure of errors to evaluate motor performance. Based on this research desired indices, the computer software was designed and developed using MATLAB, C++, C programming languages. To determine construct validity, the correlation coefficient between manual results and automatic calculated results was assessed which was equal to 1 correlation. Furthermore, subjects were asked to follow the circle, square and triangle paths of rotary pursuit device which resulted in 0/83 correlation. This software having multiple applications, benefits from the advantage to be easily used by researchers and users with different levels and has a very accurate output.

The purpose of this study was to determine the effect of external attentional focus instructions on learning tracking task under dual-task condition. Forty-two students of Kerman University (aged 19–25) were randomly devided into three groups (the distal external group, proximal external group and control group) after participating in the pre-test. Then, the participants practiced the tracking task in four blocks of four attempt. After 48 hours, they participated in delay retention test under dual-task condition (auditory). In order to measure the performance in tracking task, we used tow-hand coordination test of Vienna set, and the mean total duration in this task was calculated as related variable. Proximal external focus group received instructions about joysticks movements. Distal external focus group received instructions about red dot movement in different parts of track. Control group didn’t receive any instructions. Repeated measures ANOVA test was used in order to specify the difference in acquisition and retention phases. Result showed significant difference between different training blocks in acquisition phase (P = 0.0001) and between attentional groups in retention stage of the test (P = 0.0001). These findings express that increasing the distance of an external focus of attention improves tracking task learning, especially under secondary task; because secondary task condition will enhance attention resources and shift attentional focus to external resource.