Thermoregulatory responses to exercise in the heat: Chronic caffeine intake has no effect

被引:0
|
作者
Roti, MW
Casa, DJ
Pumerantz, AC
Watson, G
Judelson, DA
Dias, JC
Ruffin, K
Armstrong, LE
机构
[1] Univ Connecticut, Human Performance Lab, Storrs, CT USA
[2] Univ Connecticut, Dept Kinesiol, Storrs, CT USA
来源
关键词
chronic caffeine; exercise heat tolerance; fluid-electrolytes; hydration; endurance;
D O I
暂无
中图分类号
R1 [预防医学、卫生学];
学科分类号
1004 ; 120402 ;
摘要
Introduction: Authorities advise individuals to refrain from caffeine intake before or during exercise, especially when performed in the heat, due to potential fluid-electrolyte imbalances that exaggerate physiological strain. Yet, military personnel are often deployed to hot environments and must perform under sleep-deprived conditions where caffeine would be an ideal intervention strategy to enhance physical and cognitive performance. Purpose: To assess the effects of controlled chronic and acute caffeine ingestion on fluid-electrolyte, physiological and thermoregulatory responses during an exercise heat tolerance test (EHT). Methods: Subjects were 59 active, college-aged males (mean +/- SE 21.6 +/- 0.4 yr, 177.9 +/- 0.8 cm, 75.4 +/- 1.0 kg, 11.1 +/- 0.7% body fat) who were randomized and stratified by age, bodyweight, and body composition into three groups. All subjects equilibrated caffeine intake at 3 mg . kg(-1) . d(-1) for days 1-6. On days 7-12, they consumed a treatment dose of either 0 (G0), 3 (G3), or 6 (G6) mg . kg(-1) . d(-1). Fluid-electrolyte and physiological measures were made on day 12, 1 h after caffeine intake, during the EHT (90 min walking, 1.56 m . s(-1), 5% grade; dry bulb temperature, 37.7 +/- 0.1 degrees C relative humidity, 56.3 +/- 1.5%). Results: There were no between-group differences (p > 0.05) in plasma, urinary, thermoregulatory, cardiovascular, and perceptual variables across time (pre- vs. post-EHT), although some of these variables increased significantly over time (p < 0.05). EHT time was significantly greater in G3 (86 2.0 min) vs. G0 (75 +/- 3.3 min, p < 0.05). Discussion: Acute caffeine ingestion, in chronically consuming subjects (3 and 6 mg . kg(-1) . d(-1)) did not alter fluid-electrolyte, exercise endurance or thermoregulatory responses during EHT when compared with G0.
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页码:124 / 129
页数:6
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