Document Type : Original Articles
Authors
1 Department of Sports Science, Faculty of Literature and Humanities, Malayer University, Malayer
2 Department of Exercise Physiology, Faculty of Sport Sciences, Alzahra University, Tehran, Iran.
3 Department of Exercise Physiology, Faculty of Sport Sciences, Alzahra University, Tehran, Iran
4 Department of Mechanical Engineering, Jundi-Shapur University of Technology, Dezful, Iran
Abstract
Background: The interaction of lack of sleep and fatigue increases the possibility of injury in different people. Examining the components of ground reaction forces during activities such as cutting maneuver, provides valuable information about the correct functioning of the musculoskeletal system. The aim of the present study was to investigate the effect of Partial sleep deprivation on the components of the ground reaction force before and after fatigue.
Method: The present research method was semi-experimental. 14 young women participated in this study. Each subject was evaluated twice with an interval of 5 days. The night before the pre-test, the subjects had full sleep, and the night before the post-test, the subjects experienced 4 hours of sleep deprivation at the beginning of the night. In the pre-test and post-test, participants repeated 5 attempts without fatigue and 3 attempts with fatigue. In all conditions, ground reaction force (GRF) components were measured using the Kistler force plate.
Results: The results showed that at the heel contact phase (FZ1), fatigue (P=0.012) and fatigue with partial sleep deprivation (P=0.025) decreased the time to reach the peak of vertical ground reaction force. Also, the interaction of fatigue and partial sleep deprivation caused a significant decrease in vertical loading rate (p=0.019). However, no significant difference was observed in the peak of ground reaction forces and the impulse between different conditions. Conclusion: It seems that the interaction of fatigue and partial sleep deprivation significantly increases the risk factors for injury, include loading rates, by reducing the time to reach peak ground reaction forces.
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