Related Experiment Video
Updated: Sep 14, 2025
09:29
Skeletal Muscle Gender Dimorphism from Proteomics
Published on: December 14, 2011
12.6K
Sex Differences in Muscle Activity After a Maximal Intermittent Fatiguing Protocol With a Flywheel Device.
Jorge Salse-Batán1, Michel Marina1, Priscila Torrado1
1Research Group in Physical Activity and Health (GRAFAiS), Institut Nacional d'Educació Física de Catalunya (INEFC)-Universitat de Barcelona (UB), Barcelona, Spain.
Summary
Males and females show distinct muscle activity patterns after flywheel exercise fatigue. Females may benefit from higher training volumes or shorter recovery periods due to sex-based differences in muscle activation.
Area of Science:
- Exercise Physiology
- Sports Science
- Biomechanics
Background:
- Understanding sex differences in muscle response to fatigue is crucial for optimizing training.
- Flywheel devices offer a unique method for inducing fatigue and studying muscle adaptations.
Purpose of the Study:
- To investigate sex-specific muscle activity changes following a maximal intermittent fatiguing protocol (IFPmax) using a flywheel device.
- To compare neuromuscular responses between males and females after a standardized fatiguing exercise bout.
Main Methods:
- Fifteen males and 17 females performed an IFPmax (10 sets of 10 half-squats with flywheel).
- Maximal isometric half-squat and countermovement jump tests were conducted pre- and post-IFPmax.
- Surface electromyography (EMG) analyzed muscle activity in key lower-body muscles (gluteus maximus, quadriceps, hamstrings).
Main Results:
- Both sexes showed similar declines in maximal force and jump performance post-fatigue.
- Males had higher baseline power but this difference diminished after IFPmax.
- Males exhibited greater agonist muscle EMG reduction, while females showed increased antagonist muscle activity.
- Hip-to-knee cocontraction increased similarly, but distinct sex-specific muscle activation patterns emerged.
Conclusions:
- Sex-related differences in muscle activity post-IFPmax suggest potential for higher training volumes or shorter recovery for females.
- Findings highlight the importance of sex-specific considerations for optimizing flywheel training protocols.
- Individualized training strategies based on sex differences can enhance performance and adaptation.
