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Human thermoregulation after atropine and/or pralidoxime administration
Aviation, Space, and Environmental Medicine
|June 1, 1987
Summary
Atropine reduced sweating and increased body temperature during exercise, while pralidoxime decreased sweating but increased skin blood flow. Combined, these drugs worsened heat exchange.
Area of Science:
- Exercise Physiology
- Pharmacology
- Thermoregulation
Background:
- Heat exchange during exercise is critical for maintaining homeostasis.
- Autonomic drugs can significantly impact physiological responses to exercise.
- Understanding drug effects on thermoregulation is vital for safety and performance.
Purpose of the Study:
- To investigate the effects of atropine and pralidoxime on heat exchange during exercise.
- To determine the individual and combined impacts of these drugs on sweating, skin blood flow, and body temperature.
- To assess the compensatory mechanisms involved in thermoregulation under drug influence.
Main Methods:
- Four healthy males performed cycle exercise at 55% VO2 peak in a temperate environment.
- Intramuscular injections of saline (control), atropine (2 mg), and/or pralidoxime (600 mg) were administered.
- Measurements included esophageal, rectal, and mean skin temperatures, sweating rates, and forearm skin blood flow.
Main Results:
- Atropine significantly decreased sweating (-60%) and increased core (+0.4°C) and skin (+2.1°C) temperatures.
- Pralidoxime reduced whole-body sweating (-45%) but increased skin blood flow (+33%).
- The combination of atropine and pralidoxime resulted in higher core and skin temperatures than atropine alone.
Conclusions:
- Atropine impairs thermoregulation by reducing sweating, leading to elevated body temperatures.
- Pralidoxime also inhibits sweating but may partially compensate through increased skin blood flow.
- Combined drug administration exacerbates the thermoregulatory disadvantage, highlighting the importance of considering drug interactions in exercise environments.