1- Department of Sport Sciences, University of Bojnord, Bojnord, Iran
2- Department of Medical Physics and Radiology, School of Allied Medical Sciences, North Khorasan University of Medical Sciences, Bojnurd,Iran ,a.younessi7@gmail.com
2- Department of Medical Physics and Radiology, School of Allied Medical Sciences, North Khorasan University of Medical Sciences, Bojnurd,Iran ,
Abstract: (30 Views)
Background: Muscle fatigue is a major factor contributing to impaired function and reduced performance in basketball players, particularly in maintaining balance during jump shooting. This study aimed to evaluate the effects of isotonic fatigue on the electromyographic (EMG) signals of the quadriceps and hamstring muscles in female basketball players during jump shooting.
Methods: Twelve professional female basketball players participated in this study. EMG signals were recorded from the quadriceps and hamstring muscles following a standardized warm-up and during jump shooting. Fatigue was induced using isotonic contractions. Following the fatigue protocol, EMG signals were recorded again, and the signal features obtained before and after fatigue were compared. Six time-domain features and three frequency-domain features were analyzed. Statistical analysis was performed using SPSS version 20, with the significance level set at 0.05.
Results: Analysis of the time-domain features revealed that the most pronounced changes occurred in the quadriceps muscles. The root mean square (RMS) and mean absolute value (MAV) increased significantly, whereas zero crossing (ZC) decreased significantly after fatigue compared with the pre-fatigue condition. Analysis of the frequency-domain features demonstrated a significant decrease in median frequency (MDF) across all muscles following fatigue.
Conclusion: The findings suggest that fatigue of the knee muscles may alter the activation patterns of the muscles surrounding the knee joint, thereby impairing balance during jump shooting. These findings may contribute to the development of rehabilitation and training programs aimed at minimizing fatigue-induced neuromuscular alterations and improving performance in basketball players.
Methods: Twelve professional female basketball players participated in this study. EMG signals were recorded from the quadriceps and hamstring muscles following a standardized warm-up and during jump shooting. Fatigue was induced using isotonic contractions. Following the fatigue protocol, EMG signals were recorded again, and the signal features obtained before and after fatigue were compared. Six time-domain features and three frequency-domain features were analyzed. Statistical analysis was performed using SPSS version 20, with the significance level set at 0.05.
Results: Analysis of the time-domain features revealed that the most pronounced changes occurred in the quadriceps muscles. The root mean square (RMS) and mean absolute value (MAV) increased significantly, whereas zero crossing (ZC) decreased significantly after fatigue compared with the pre-fatigue condition. Analysis of the frequency-domain features demonstrated a significant decrease in median frequency (MDF) across all muscles following fatigue.
Conclusion: The findings suggest that fatigue of the knee muscles may alter the activation patterns of the muscles surrounding the knee joint, thereby impairing balance during jump shooting. These findings may contribute to the development of rehabilitation and training programs aimed at minimizing fatigue-induced neuromuscular alterations and improving performance in basketball players.
Article Type: Research |
Subject:
Basic medical sciences
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