Effects of Ephedrine/Xanthines on Thermogenesis and Cold Tolerance

摘要

This paper reviews the use of ephedrine (E) and xanthines (X) to improvethermogenesis and cold tolerance. Recent experiments in cold-exposed subjects have shown that the beneficial effects of ingesting an E/caffeine (C) capsule on metabolic rate (M), heat debt, deep body core temperature (T (sub re)) (P<0.05) is entirely comparable to that observed with an E/C/theophylline (T) capsule. Although T has been reported to reduce the drop in T sub re in several studies, these improvements are difficult to explain in the absence of changes in M. A theobromine-based commercial sports bar has been similarly shown to reduce the drop in T (sub re), However, such a claim could not be confirmed in our lab, even in two studies performed under different environmental conditions.