男性在次最大运动期间摄入咖啡因的体温调节作用。

Thermoregulatory effects of caffeine ingestion during submaximal exercise in men.

作者信息

Dunagan N, Greenleaf J E, Cisar C J

机构信息

Exercise Physiology Laboratory, San Jose State University, CA, USA.

出版信息

Aviat Space Environ Med. 1998 Dec;69(12):1178-81.

PMID:9856543

Abstract

BACKGROUND

The exclusive effect of caffeine ingestion on exercise thermoregulation is unclear; data indicate that caffeine may have a positive effect, a negative effect, or no effect.

METHODS

Rectal (TRE) and mean skin (TSK) temperatures, skin heat conductance (HSK), and sweat rate (MSW) were measured during 30 min of rest and subsequent 70 min of submaximal cycle-ergometer exercise (67% VO2PEAK) in 11 aerobically conditioned men (mean +/- SD 29 +/- 6 yr, 49 +/- 6 mL x min(-1) x kg(-1) VO2PEAK) under two conditions: a caffeine (10 mg x kg(-1) ingestion (CI) session and a noncaffeine ingestion (NCI) control session.

RESULTS

There were no significant differences in physiological or thermoregulatory parameters during exercise: X (+/-SE) end exercise levels for the NCI and CI sessions, respectively, were VO2 = 2.50 +/- 0.09 vs. 2.55 +/- 0.09 L x min(-1); heart rate = 145 +/- 7 vs. 145 +/- 5 bpm; HSK = 30 +/- 3 vs. 28 +/- 3 kcal x m(-2) x h(-1) x degrees C(-1); MSW = 393 +/- 35 vs. 378 +/- 36 g x m(-2) x h(-1); and TRE = 38.3 +/- 0.2 vs. 38.4 +/- 0.1 degrees C. Control TSK was lower than that for CI by 0.4 to 0.5 degrees C at rest and during exercise.

CONCLUSION

Ingestion of a high level (10 mg x kg(-1) of caffeine has no effect on skin heat conductance, sweating, or the rate of increase and final level of rectal temperature during moderate, submaximal leg exercise.

摘要

背景

咖啡因摄入对运动体温调节的独特影响尚不清楚；数据表明咖啡因可能有积极作用、消极作用或无作用。

方法

在11名有氧条件良好的男性（平均±标准差29±6岁，49±6 mL·min⁻¹·kg⁻¹ 最大摄氧量）中，于两种条件下测量静息30分钟及随后70分钟次最大强度自行车测力计运动（67%最大摄氧量）期间的直肠温度（TRE）、平均皮肤温度（TSK）、皮肤热传导率（HSK）和出汗率（MSW）：一种是咖啡因摄入（10 mg·kg⁻¹）试验，另一种是非咖啡因摄入（NCI）对照试验。

结果

运动期间生理或体温调节参数无显著差异：NCI和CI试验结束运动时的X（±标准误）水平分别为：摄氧量 = 2.50±0.09 与 2.55±0.09 L·min⁻¹；心率 = 145±7 与 145±5 次/分钟；HSK = 30±3 与 28±3 kcal·m⁻²·h⁻¹·℃⁻¹；MSW = 393±35 与 378±36 g·m⁻²·h⁻¹；TRE = 38.3±0.2 与 38.4±0.1℃。静息和运动期间，对照TSK比CI的低0.4至0.5℃。