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Amphetamine enhances endurance by increasing heat dissipation
Ekaterina Morozova1, Yeonjoo Yoo2, Abolhassan Behrouzvaziri2
1Department of Physics, Indiana University, Bloomington, Indiana.
Physiological Reports
|September 9, 2016
Summary
Amphetamine may help athletes run longer by slowing body temperature rise during exercise. However, this increases muscle overheating risk, potentially harming the thermoregulatory system.
Area of Science:
- Exercise Physiology
- Pharmacology
- Thermoregulation
Background:
- Athletes use amphetamines for performance enhancement via unclear mechanisms.
- Body temperature significantly influences exercise-induced exhaustion.
Purpose of the Study:
- To investigate amphetamine's effect on thermoregulation during exercise.
- To elucidate the physiological mechanisms underlying amphetamine's ergogenic effects.
Main Methods:
- Core body temperature and oxygen consumption were measured in rats running on a treadmill.
- Rats were treated with amphetamine (2 mg/kg or 1 mg/kg) or a placebo.
- A two-compartment mathematical model was used to analyze temperature dynamics.
Main Results:
- Amphetamine (2 mg/kg) significantly increased running duration compared to controls.
- Amphetamine slowed core body temperature rise without altering oxygen consumption.
- Mathematical modeling indicated increased heat dissipation in the core and higher muscle temperatures post-exercise.
Conclusions:
- Amphetamine may delay fatigue by reducing exercise-induced core body temperature increases through enhanced heat dissipation.
- This effect, however, compromises thermoregulatory integrity and risks dangerous muscle overheating.
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