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Lower extremity neuromuscular control immediately after fatiguing hip-abduction exercise
Kelly L McMullen1, Nicole L Cosby, Jay Hertel
1University of Rochester Medical Center, NY, USA.
Journal of Athletic Training
|April 11, 2012
Summary
Gluteus medius (GMed) fatigue negatively impacts postural control and movement quality in both men and women. Despite sex-based differences in muscle recruitment, balance deficits were similar after fatiguing hip-abduction exercises.
Area of Science:
- Biomechanics
- Exercise Physiology
- Motor Control
Background:
- Gluteus medius (GMed) fatigue can impair pelvic stabilization, potentially decreasing postural control.
- Investigating sex-based differences in muscular recruitment during GMed fatigue is crucial for understanding movement adaptations.
Purpose of the Study:
- To compare postural control and quality of movement between men and women following a fatiguing hip-abduction exercise protocol.
Main Methods:
- A descriptive laboratory study involving 18 men and 18 women.
- Participants underwent a fatiguing hip-abduction exercise until a 15% shift in GMed electromyographic median frequency was achieved.
- Postural control and movement quality were assessed using static and dynamic balance tests and the lateral step-down test.
Main Results:
- No significant differences in balance deficits were observed between men and women (P > .05).
- All post-fatigue outcome measures demonstrated significant main effects for time (P ≤ .05), indicating a decline in performance after fatigue.
Conclusions:
- Gluteus medius fatigue negatively affects postural control and movement quality in both sexes.
- At comparable levels of local muscle fatigue, men and women exhibit similar postural control responses.
