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Gender impacts the post-exercise substrate and endocrine response in trained runners
Lisa M Vislocky1, P Courtney Gaine1, Matthew A Pikosky1
1Department of Nutritional Sciences, 3624 Horsebarn Hill Road Ext. Unit 4017, University of Connecticut, Storrs, Connecticut, USA.
Journal of the International Society of Sports Nutrition
|February 28, 2008
Summary
This study reveals distinct sex differences in hormonal and metabolic recovery after endurance exercise. Females showed increased glucose, lactate, and insulin, while males exhibited altered growth hormone and IGF-I levels post-exercise.
Area of Science:
- Exercise Physiology
- Endocrinology
- Sports Science
Background:
- Limited research exists on sex-based differences in prolonged recovery from endurance exercise.
- Understanding these differences is crucial for optimizing training and recovery protocols.
Purpose of the Study:
- To compare endocrine and substrate profiles in trained male and female runners during a 3.5-hour recovery period post-endurance exercise.
- To identify sex-specific physiological responses to prolonged exercise recovery.
Main Methods:
- Trained male and female runners completed an endurance run at 70% VO2peak.
- Blood samples were collected at rest and during recovery to measure glucose, lactate, FFAs, insulin, cortisol, GH, and IGF-I.
- Participants maintained a standardized euenergetic diet for 8 days prior to testing.
Main Results:
- Females exhibited increased glucose, lactate, and insulin levels during recovery, unlike males.
- Males showed increased growth hormone (GH) and decreased free insulin-like growth factor I (IGF-I) levels.
- Free fatty acid (FFA) levels rose in both sexes, with no significant gender difference.
Conclusions:
- The findings highlight significant gender-specific differences in substrate and endocrine responses during prolonged recovery from endurance exercise.
- Further research is recommended to explore the impact of varying diets and nutritional supplements on these sex-specific post-exercise adaptations.
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