The aim of this study was to examine the relationship between resting morning heart rate variability (HRV) metrics and indirect markers of hydration status in elite male athletes. Twenty-two field hockey players (age 26.8 ± 3.4 yr; height 178.4 ± 6.3 cm; body mass 76.2 ± 7.4 kg) were monitored over 10-d during a pre-Olympic training camp. Measurement of heart rate variability (HRV) during an orthostatic challenge, urine specific gravity (Usg, first morning void) and body mass were captured on seven of the mornings. Individual generalized linear mixed models evaluated the relationships between supine and standing HRV metrics with Usg and day-to-day change in body mass. No meaningful relationships were identified between supine (estimates −0.002 to 0.001) or standing (−0.002 to 0.003) HRV metrics and Usg as well as between supine (−0.003 to 0.016) or standing (−0.004 to 0.006) HRV metrics and changes in body mass. These outcomes indicate that supine and standing HRV metrics are not influenced by indirect indices of hydration status in elite male field hockey players.

本研究的目的是检查优秀男性运动员的静息早晨心率变异性 (HRV) 指标与水合状态的间接标志物之间的关系。22 名曲棍球运动员（年龄 26.8 ± 3.4 岁；身高 178.4 ± 6.3 cm；体重 76.2 ± 7.4 kg）在奥运会前的训练营期间接受了 10 天的监测。测量直立性挑战期间的心率变异性 (HRV)、尿比重（Usg，第一次早晨排尿）和体重在七个早晨被捕获。个体广义线性混合模型评估了仰卧和站立 HRV 指标与 Usg 和体重日常变化之间的关系。仰卧位（估计值 -0.002 至 0.001）或站立位（-0.002 至 0.003）HRV 指标与 Usg 以及仰卧位（-0.003 至 0. 016) 或站立 (-0.004 至 0.006) HRV 指标和体重变化。这些结果表明，仰卧和站立 HRV 指标不受精英男子曲棍球运动员水合状态的间接指数的影响。