Sweating responses to central and peripheral heating in spinal man

Area of Science:

• Human Physiology
• Thermoregulation
• Environmental Physiology

Background:

• Understanding the complex interplay between central and peripheral thermal stimuli is crucial for comprehending human thermoregulation.
• Previous research has explored various aspects of thermal comfort and physiological responses to temperature changes.

Purpose of the Study:

• To investigate the independent and combined effects of central and peripheral heating and cooling on human sweating responses.
• To determine the relationship between core temperature and sweating rates at different body locations.
• To examine how ambient (skin) temperature influences the central temperature thresholds for sweating.

Main Methods:

• Experiments were conducted on resting subjects (T6) under controlled ambient temperatures ranging from 20-34°C.
• Central and peripheral heating and cooling stimuli were applied to assess their impact on sweating.
• Local and mean sweating rates were measured and correlated with core body temperature.

Main Results:

• Sentient skin heating alone, at a constant core temperature, did not initiate sweating.
• Skin cooling alone caused a significant and rapid decrease in the sweating response.
• Central heating induced sweating, with thresholds inversely related to ambient skin temperatures.
• Both local and mean sweating rates showed a linear relationship with core temperature.
• The slopes of local sweating rates versus core temperature varied by body region (chest, forearm, forehead).

Conclusions:

• Peripheral skin temperature significantly modulates the central control of sweating.
• Core temperature is a primary determinant of sweating rate, but its relationship with local sweating varies regionally.
• Thermoregulatory responses are complex, involving integrated signals from both central and peripheral thermal receptors.