Hydration status after exercise affect resting metabolic rate and heart rate variability
Mauricio Castro-Sepulveda1, Hugo Cerda-Kohler2, Cristian Pérez-Luco3
1Exercise Science Laboratory, Faculty of Medicine, Universidad Finis Terrae, Santiago, Chile.. m.castro.med@gmail.com.
Nutricion Hospitalaria
|March 2, 2015
Summary
Dehydration significantly impacts athletes' resting metabolic rate and heart rate variability post-exercise. Proper hydration control is crucial before assessing these physiological markers.
Area of Science:
- Sports Science
- Human Physiology
- Exercise Physiology
Background:
- Heart rate variability (HRV) and resting metabolic rate (RMR) are key indicators of athlete physiological status and energy demands.
- Exercise can lead to significant dehydration, potentially impacting homeostasis.
Purpose of the Study:
- To compare the effects of dehydration versus rehydration on HRV and RMR in college athletes following exercise.
Main Methods:
- 14 college athletes were divided into dehydration and rehydration groups.
- Both groups underwent active dehydration (-3.4% body mass).
- The rehydration group consumed fluids equivalent to 150% of body mass loss; the dehydration group rested. HRV and RMR were measured before and 4 hours after dehydration.
Main Results:
- Both groups showed increased RMR post-intervention (dehydration: +30%, rehydration: +13%).
- The dehydration group experienced a significant reduction in HRV, unlike the rehydration group.
- The increase in RMR was significantly greater in the dehydration group compared to the rehydration group.
Conclusions:
- Hydration status significantly influences RMR and HRV after exercise in athletes.
- Controlling hydration state is essential prior to assessing RMR and HRV to ensure accurate physiological evaluation.
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