Caffeine vs caffeine-free sports drinks: Effects on urine production at rest and during prolonged exercise
Caffeine vs caffeine-free sports drinks: Effects on urine production at rest and during prolonged exercise
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DOI：
10.1055/s-2007-972593
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发表时间：
1997-01-01
影响因子：
2.5
通讯作者：
McKeever, KH
中科院分区：
文献类型：
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作者：
Wemple, RD;Lamb, DR;McKeever, KH
我们比较了含咖啡因和不含咖啡因的碳水化合物电解质（CE）饮料对6名受试者在休息4小时或休息1小时后接着以60%最大摄氧量（VO₂max）骑行3小时期间的尿量（UV）、自由水清除率（C - H₂O）、水的分排泄率（FEH₂O）以及渗透压排泄的影响。我们还在3小时运动试验后测试了以85% VO₂max进行运动的最大表现。在两次休息试验以及两次休息 + 运动试验过程中，受试者摄入不含（安慰剂组，PLAC）或含（咖啡因组，CAFF）咖啡因（25毫克/分升）的CE（总体积 = 35毫升/千克）。每小时采集血液样本，并记录体重和尿量。分析尿液和血液的渗透压和肌酐，并测定血浆儿茶酚胺浓度。在休息时，咖啡因组在60分钟至240分钟之间的平均（±标准误）尿量（1843 ± 116毫升）大于安慰剂组（1411 ± 181毫升）（p < 0.01）；在运动期间，咖啡因组（398 ± 32毫升）和安慰剂组（490 ± 57毫升）之间的尿量差异不显著。骑行表现不受咖啡因影响。安慰剂组和咖啡因组之间的血浆儿茶酚胺浓度没有差异，但运动期间比休息时更高（p
（最后一个单词“p”似乎不完整，如果还有后续内容，请提供完整信息以便更准确地翻译。）
We compared the effects of caffeinated vs non-caffeinated carbohydrate electrolyte (CE) drinks on urine volume (UV), free water clearance (C-H2O), fractional excretion of water (FEH(2)O), and osmolar excretion during 4 h of rest or 1 h rest followed by 3 h of cycling at 60% VO(2)max in six subjects. We also tested maximal performance at 85% VO(2)max following the 3-h exercise trials. Throughout the two resting trials and the two rest + exercise trials, subjects ingested CE (total volume = 35 ml/kg) without (PLAC) or with (CAFF) caffeine (25 mg/dl). Blood samples were collected, and body weight and UV were recorded every hour. Urine and blood were analyzed for osmolality and creatinine, and plasma catecholamine concentrations were determined. At rest, mean (+/-SE) UV between 60 min and 240 min was greater for CAFF (1843+/-116 ml) vs PLAC (1411+/-181 ml) (p < 0.01); during exercise the difference in UV between GAFF (398+/-32 ml) and PLAC (490+/-57 ml) was not significant. Cycling performance was unaffected by caffeine. Plasma catecholamine concentrations were not different between PLAC and CAFF but were greater during exercise than rest (p