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Abstract：
Adequate fluid replacement during exercise is an important consideration for athletes, however sweat rate (SR) can vary day-to-day. The purpose of this study was to investigate day-to-day variations in SR while performing self-selected exercise sessions to evaluate error in SR estimations in similar temperature conditions. Thirteen endurance-trained athletes completed training sessions in a case-series design 1x/week for a minimum 30 min of running/biking over 24 weeks. Body mass was recorded pre/post-training and corrected for fluid consumption. Data were split into three Wet-Bulb Globe Thermometer (WBGT) conditions: LOW (<10 °C), MOD (10-19.9 °C), HIGH (>20 °C). No significant differences existed in exercise duration, distance, pace, or WBGT for any group (p > 0.07). Significant differences in SR variability occurred for all groups, with average differences of: LOW = 0.15 L/h; MOD = 0.14 L/h; HIGH = 0.16 L/h (p < 0.05). There were no significant differences in mean SR between LOW-MOD (p > 0.9), but significant differences between LOW-HIGH and MOD-HIGH (p < 0.03). The assessment of SR can provide useful data for determining hydration strategies. The significant differences in SR within each temperature range indicates a single assessment may not accurately represent an individual\'s typical SR even in similar environmental conditions.
摘要：
运动时充足的补液是运动员的重要考虑因素,然而，出汗率（SR）可能每天都在变化。这项研究的目的是研究SR的日常变化，同时进行自我选择的锻炼，以评估在相似温度条件下SR估计的误差。13名经过耐力训练的运动员以每周1次的案例系列设计完成了训练课程，在24周内至少进行30分钟的跑步/骑行。训练前/训练后记录体重并校正流体消耗。数据分为三个湿球型球形温度计（WBGT）条件：低（<10°C），MOD(10-19.9°C),高（>20°C）。运动持续时间无显著差异，距离,步速,或任何组的WBGT(p>0.07)。所有组的SR变异性均存在显着差异，平均差异为：低=0.15L/h;MOD=0.14L/h;高=0.16L/h（p<0.05）。LOW-MOD之间的平均SR没有显着差异(p>0.9)，但LOW-HIGH和MOD-HIGH之间存在显着差异（p<0.03）。SR的评估可以为确定水合策略提供有用的数据。每个温度范围内SR的显著差异表明，即使在类似的环境条件下，单个评估也可能无法准确代表个人的典型SR。
