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Sex differences in static strength and fatigability in three different muscle groups.
J E Misner1, B H Massey, S B Going
1University of Illinois at Urbana-Champaign.
Research Quarterly for Exercise and Sport
|September 1, 1990
Summary
Males exhibited greater maximal voluntary muscle strength in some muscle groups compared to females. However, muscle fatigability during sustained contractions was higher in males than females, irrespective of the muscle group.
Area of Science:
- Exercise Physiology
- Human Performance
- Muscle Physiology
Background:
- Understanding sex-based differences in muscle strength and fatigability is crucial for optimizing training and rehabilitation strategies.
- Previous research indicates potential variations in muscle force production and endurance between males and females.
Purpose of the Study:
- To compare maximal voluntary static muscle force production and fatigability between young males and females across different muscle groups.
- To investigate potential sex differences in the decline of muscle force over a sustained 2-minute contraction.
Main Methods:
- Maximal voluntary static muscle force was measured in right-hand finger flexors (RHF), right-leg extensors (RLE), and both leg extensors (BLE) in young males and females.
- Participants performed 2-minute sustained contractions to assess impulse (force x time) and calculate fatigability.
- Statistical analyses were conducted to determine significant differences between sexes and muscle groups, and for sex x time interactions.
Main Results:
- Significant sex differences were observed for RHF and BLE maximal strength, with males demonstrating higher force.
- No significant sex difference was found for RLE maximal strength.
- Muscle impulse declined significantly over the 2-minute contraction, with significant differences between muscle groups but not between sexes.
- A significant sex x time interaction indicated greater fatigability in males compared to females during the sustained contractions.
Conclusions:
- While males generally exhibit greater maximal strength in certain upper and lower limb muscle groups, muscle fatigability during sustained efforts is more pronounced in males than females.
- These findings highlight the importance of considering sex-specific responses in muscle endurance and fatigue when designing exercise interventions or assessing physical performance.