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Sex differences in postexercise esophageal and muscle tissue temperature response
1Laboratory of Human Bioenergetics and Environmental Physiology, School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada.
Summary
Females exhibit higher core and muscle temperatures post-exercise compared to males, alongside a greater drop in blood pressure. This suggests sex differences in blood pressure regulation impact temperature control after exercise.
Area of Science:
- Exercise Physiology
- Thermoregulation
- Cardiovascular Physiology
Background:
- Blood pressure regulation during post-exercise recovery significantly impacts core temperature control.
- Sex-related differences in post-exercise hemodynamics and their effect on core and muscle temperature remain unclear.
Purpose of the Study:
- To investigate whether sex differences in post-exercise hemodynamics influence core and muscle temperature responses.
- To compare post-exercise esophageal temperature, muscle temperature, blood pressure, cutaneous vascular conductance, and sweat rate between males and females.
Main Methods:
- Sixteen healthy adults (8 males, 8 females) performed moderate-intensity knee extensions (60% peak oxygen consumption) for 15 minutes, followed by 90 minutes of recovery.
- Measured core (esophageal) and muscle (vastus medialis, triceps brachii) temperatures, mean arterial pressure (MAP), cutaneous vascular conductance (CVC), and sweat rate throughout recovery.
Main Results:
- Females showed higher esophageal temperature (0.19°C) and muscle temperatures (0.46–0.70°C) during the initial recovery period compared to males.
- Females experienced a greater reduction in mean arterial pressure (5–7 mmHg) and exhibited lower cutaneous vascular conductance and sweat rates post-exercise.
- These sex-based differences in temperature and hemodynamic responses were statistically significant.
Conclusions:
- Females demonstrate a more pronounced and sustained elevation in post-exercise core and muscle temperatures.
- A greater post-exercise hypotensive response in females is associated with altered thermoregulatory mechanisms.
- Sex-specific hemodynamic responses play a crucial role in modulating temperature regulation after exercise.
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