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Medicine & Science in Sports & Exercise:
doi: 10.1249/MSS.0b013e31827981dc
Basic Sciences

Aspirin and Clopidogrel Alter Core Temperature and Skin Blood Flow during Heat Stress

BRUNING, REBECCA S.; DAHMUS, JESSICA D.; KENNEY, W. LARRY; ALEXANDER, LACY M.

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Abstract

Antithrombotic therapy with oral aspirin (ASA) or clopidogrel (CLO) (Plavix®; Bristol-Myers Squibb, Bridgewater, NJ) is associated with an attenuated skin vasodilator response and a greater rate of rise in core temperature in healthy, middle-age individuals during passive heating in a water perfused suit.

Purpose: The present double-blind, crossover study examined the functional consequences of 7 d of low-dose ASA (81 mg·d−1) versus CLO (75 mg·d−1) treatment in 14 healthy, middle-age (50–65 yr) men and women during passive heating in air (40 min at 30°C, 40% relative humidity) followed by exercise (60% V˙O2peak).

Methods: Oral temperature (Tor) was measured in the antechamber (23.0°C ± 0.1°C) before entering a warm environmental chamber. After 40 min of rest, subjects cycled on a recumbent cycle ergometer for up to 120 min. Esophageal temperature (Tes) and laser Doppler flux were measured continuously, and the latter was normalized to maximal cutaneous vascular conductance (%CVCmax).

Results: Before entry into the environmental chamber there were no differences in Tor among treatments; however, after 40 min of rest in the heat, Tes was significantly higher for ASA and CLO versus placebo (37.2°C ± 0.1°C, 37.3°C ± 0.1°C, vs 37.0°C ± 0.1°C, both P < 0.001), a difference that persisted throughout exercise (P < 0.001 vs placebo). The mean body temperature thresholds for the onset of cutaneous vasodilation were shifted to the right for both ASA and CLO during exercise (P < 0.05).

Conclusion: ASA and CLO resulted in elevated core temperatures during passive heat stress and shifted the onset of peripheral thermoeffector mechanisms toward higher body temperatures during exercise heat stress.

©2013The American College of Sports Medicine

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