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Effects of changing hypothalamic temperature on eccrine sweating in the patas monkey
C V Gisolfi1, M D Owen, P T Wall
1Department of Physiology & Biophysics and Exercise Science, University of Iowa, Iowa City, 52242.
Brain Research Bulletin
|February 1, 1988
Summary
Sweating in patas monkeys is influenced by both internal body temperature and external skin temperature. Non-thermal factors like heart rate also affect sweat rate (mSW).
Area of Science:
- Physiology
- Thermoregulation
- Primate Studies
Background:
- Understanding thermoregulation in primates is crucial for physiological research.
- Patas monkeys (Erythrocebus patas) serve as a model for studying heat exchange mechanisms.
Purpose of the Study:
- To investigate the control of sweating in patas monkeys.
- To determine the influence of hypothalamic temperature and skin temperature on sweat rate.
Main Methods:
- Bilateral thermodes were implanted in patas monkeys to manipulate hypothalamic temperature (THYPO).
- Measurements included THYPO, colonic temperature (Tc), mean skin temperature (Tsk), chest sweat rate (mSW), and heart rate (HR).
- Thermodes were perfused with water to alter THYPO, and Tsk was manipulated by changing ambient conditions.
Main Results:
- Increasing THYPO from 37 to 41°C significantly increased mSW.
- Reduced Tsk shifted the THYPO:mSW relationship, indicating peripheral influence on sweating.
- Heart rate fluctuations correlated with sweating changes when THYPO was constant, suggesting nonthermal influences.
Conclusions:
- Sweat rate in patas monkeys is regulated by both central (hypothalamic) and peripheral (skin) thermal inputs.
- Nonthermal factors, such as heart rate, also play a role in modulating sweat rate.
- These findings enhance our understanding of primate thermoregulatory control mechanisms.