جستجوی مقالات مرتبط با کلیدواژه « خستگی جسمی » در نشریات گروه « تربیت بدنی »

This study aimed to investigate the effects of peripheral and central fatigues on depth perception error in students. The statistical population consisted of students in Khodabande city. 42 subjects (mean age of 16.88 ± 0.49 years) were selected by convenience sampling method. All subjects took depth perception pretest. Then, they were divided into the intervention and control groups. To produce peripheral fatigue (physical), the first group received physical fitness activity and the second group received mental activity to produce central (mental) fatigue. The third group did not perform any activity during the intervention period. The depth perception posttest was performed after the fatigue intervention. The results of one-way analysis of variance showed no significant differences in the pretest among the groups, but there was a significant difference in the posttest among the groups. LSD post hoc test results showed that central fatigue increased depth perception error in comparison with peripheral fatigue and no intervention (control group). But no significant differences were observed in depth perception error between peripheral fatigue and control groups. Paired t test results showed an increase in depth perception errors resulted from both types of fatigue and the lack of change in the control group. Overall, it can be concluded that central fatigue had an effective role in increasing students' depth perception error when compared to peripheral error. Therefore, coaches are advised to adopt appropriate conditions that reduce central fatigue.

Fatigue is one of the factors affecting the performance of athletes. By understanding the consequences and impact of fatigue on the performance of individuals, certain considerations can be taken into account to prevent it during exercises. Therefore, knowing what an athlete goes through while experiencing central and peripheral fatigue can be the key to success for coaches. Thus, the present study aims to determine the effect of central and peripheral fatigue on throwing accuracy and velocity of handball players. To this purpose, 16 female players of University of Tehran Handball team (with the average age of 23±4) were selected to participate in the study. Giving their informed consent and filling the Edinburgh Handedness Inventory questionnaire, participants took throwing accuracy and velocity pre-test for 11 times consecutively. Thereafter, they were assigned into two groups randomly: central fatigue group and peripheral fatigue group. Two-hour high-intensity physical exercise was used for the peripheral fatigue group and Stroop task was used for central fatigue group to induce mental fatigue. After the given intervention, post-test was conducted similar to the pre-test. Results of 2×2 compound variance of velocity variable indicated that main effect of test (P = 0.021) and interaction effect between group and test (P = 0.01) were significant. However, main effect of group (P = 0.19) was non-significant. Independent t-test results revealed that there is a significant difference between throwing velocity of the two groups (P = 0.024) in post-test, and peripheral fatigue group showed lesser velocity rate compared to central fatigue group. Nonetheless, regarding accuracy variable, no significance was found in the main effect of group (P = 0. 24) and interaction effect between test and group (P = 0.42). Therefore, according to dynamic systems theory, peripheral fatigue has a negative impact on external features of movement, and it is as a result of reduced capacity of effectors; however, central fatigue fails to affect kinetic parameter (velocity).