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Free-living, continuous hypo-hydration, and cardiovascular response to exercise in a heated environment.
Kate S Early1,2, Conrad P Earnest3, Bailey Theall1
1School of Kinesiology, Louisiana State University, Baton Rouge, Louisiana.
Physiological Reports
|April 25, 2018
Summary
Chronic dehydration impacts exercise responses in heat, increasing heart rate. Good cardiovascular health may aid heat dissipation during dehydration, even in young adults.
Area of Science:
- Exercise Physiology
- Environmental Health
- Cardiovascular Health
Background:
- Chronic dehydration and heat stress can negatively affect exercise physiology.
- The interplay between cardiovascular health and physiological responses to exercise under dehydration and heat is not fully understood.
Purpose of the Study:
- To investigate the effects of free-living induced dehydration on physiological responses during exercise in a heated environment.
- To determine if resting cardiovascular health influences these physiological changes.
Main Methods:
- Sixteen participants were randomized to either a dehydration (DEH) or hydration (HYD) group for three days.
- Cardiovascular health was assessed using flow-mediated dilation (FMD), pulse wave analysis, and heart rate variability (HRV).
- Physiological responses including heart rate (HR), skin temperature (Tsk), and body temperature (Tb) were measured during a 30-minute cycling exercise in a heated environment (30.3°C).
Main Results:
- Dehydration was confirmed by significant differences in pre-exercise weight, urine color, and specific gravity between groups.
- Heart rate was significantly higher in the DEH group compared to the HYD group post-exercise.
- While no group differences in temperature responses were observed during exercise, greater changes in core (Tre) and skin (Tsk) temperatures were associated with improved FMD, indicating better cardiovascular health.
Conclusions:
- Free-living dehydration alters hydration status markers and heart rate response during exercise in a heated environment.
- Resting cardiovascular health, particularly FMD, is linked to enhanced thermoregulation (changes in Tre and Tsk) during exercise under dehydration.
- Cardiovascular health plays a role in heat dissipation mechanisms even in healthy young adults experiencing dehydration.
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