在高温和轻度脱水条件下长时间运动后的液体补充策略和心率变异性恢复

IF 2.3
Ciara N. Manning, M. Morrissey, Sean P. Langan, Rebecca L. Stearns, R. Huggins, Ryan M. Curtis, Yasuki Sekiguchi, S. Laxminarayan, J. Reifman, D. Casa
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引用次数: 0

摘要

背景:在运动和战斗环境中,很少达到最佳的液体补充,加剧了生理紧张。目前尚不清楚在高温运动后的补液是否会影响心率变异性(HRV)。目的:比较规定饮水(PD)和随意饮水(AL)对高温运动后HRV的影响。方法:12名受试者(26±5岁,最大摄氧量:58.44±7.05 mL·kg−1·min−1)分别在高温(36°C, 36%湿度)条件下完成3项试验,分为PD组或AL组。24 h后评估恢复情况(水合作用和HRV)。采用三导联心电图测量HRV时间和频率。双向重复测量方差分析测量了组间HRV在试验前、试验后和随访中的变化。报告数据:p值,均值差(MD)。结果:PD恢复期液体消耗量较大(p = 0.012, MD = 1245 mL)。随访时两组均脱水。HRV时间(p < 0.001, MD = 24.23)和频率(p < 0.001, MD = - 1.98 ms2)在试验后降低,在随访后升高(时间,p < 0.001, MD = - 32.12;频率,p < 0.001, MD = 2.38 ms2)。两组HRV差异无统计学意义(p < 0.05)。结论:在高温和轻度脱水(BML≤3%)的情况下,运动后24小时补充≥60%的液体可充分补水并恢复HRV。恢复过程中规定的液体消耗量增加了30%。对热应变敏感的其他恢复措施可能提供对恢复的具体机制的更全面的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fluid Replacement Strategies and Heart Rate Variability Recovery Following Prolonged Exercise in the Heat and Mild Dehydration
Background: In sporting and combat settings, optimal fluid replacement is rarely achieved, exacerbating physiological strain. It is unknown if prescribed fluid replacement following exercise in heat impacts heart rate variability (HRV). Purpose: Compare prescribed drinking (PD) and ad libitum (AL) fluid replacement on HRV following exercise in heat. Methods: Twelve participants (26 ± 5 years, VO2max: 58.44 ± 7.05 mL·kg−1·min−1) completed three trials in heat (36 °C, 36% humidity) on separate days, and were placed into groups, PD or AL. Recovery was assessed ~24 h later (hydration and HRV). HRV time and frequency was measured using a 3-lead electrocardiogram. Two-way repeated measures analysis of variance measured changes in HRV pre-trial, post-trial, and follow-up between groups. Data reported: p-value, mean difference (MD). Results: Fluid consumption was greater in PD during recovery (p = 0.012, MD = 1245 mL). Both groups were euhydrated at follow-up. HRV time (p < 0.001, MD = 24.23) and frequency (p < 0.001, MD = −1.98 ms2) decreased post-trial and increased by follow-up (time, p < 0.001, MD = −32.12; frequency, p < 0.001, MD = 2.38 ms2). HRV was similar between groups (p > 0.05). Conclusions: Replacing ≥60% fluid sufficiently rehydrates and restores HRV 24 h post-exercise in heat and mild dehydration (BML ≤ 3%). Prescribed fluid consumption during recovery was ~30% greater. Additional measures of recovery sensitive to heat strain may provide a more holistic understanding of specific mechanisms of recovery.
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