BACKGROUND Progressive exercise-induced dehydration may impair aerobic exercise performance (AEP). However, no systematic approach has yet been used to determine how pre-exercise hypohydration, which imposes physiological challenges differing from those of a well-hydrated pre-exercise state, affects AEP and related components such as peak oxygen consumption [Formula: see text] and [Formula: see text] at lactate threshold [Formula: see text]. OBJECTIVE To determine, using a systematic approach with meta-analysis, the magnitude of the effect of pre-exercise hypohydration on AEP, [Formula: see text] and [Formula: see text]. DESIGN This was a systematic review with meta-analysis of well-controlled studies. DATA SOURCES MEDLINE, SPORTDiscus and CINAHL databases and cross-referencing. INCLUSION CRITERIA FOR SELECTING STUDIES: (1) well-controlled human (≥ 18 years) studies; (2) pre-exercise hypohydration induced at least 1 h prior to exercise onset; (3) pre-exercise body mass loss in the hypohydrated, experimental condition was ≥ 1% and ≥ 0.5% than the well-hydrated, control condition; (4) following the dehydrating protocol body mass change in the control condition was within - 1% to + 0.5% of the well-hydrated body mass. RESULTS A total of 15 manuscripts were included, among which 14, 6 and 6 met the inclusion criteria for AEP, [Formula: see text] and [Formula: see text], respectively, providing 21, 10 and 9 effect estimates, representing 186 subjects. Mean body mass decrease was 3.6 ± 1.0% (range 1.7-5.6%). Mean AEP test time among studies was 22.3 ± 13.5 min (range 4.5-54.4 min). Pre-exercise hypohydration impaired AEP by 2.4 ± 0.8% (95% CI 0.8-4.0%), relative to the control condition. Peak oxygen consumption and [Formula: see text], respectively, decreased by 2.4 ± 0.8% (95% CI 0.7-4.0%) and 4.4 ± 1.4% (95% CI 1.7-7.1%), relative to the control condition. Compared with starting an exercise hypohydrated, it is respectively likely, possible and likely that AEP, [Formula: see text] and [Formula: see text] benefit from a euhydrated state prior to exercise. Meta-regression analyses did not establish any significant relationship between differences in body mass loss and differences in the percent change in AEP or [Formula: see text]. However, [Formula: see text] was found to decrease by 2.6 ± 0.8 % (95% CI 0.7-4.5%) for each percent loss in body mass above a body mass loss threshold of 2.8%. CONCLUSION Pre-exercise hypohydration likely impairs AEP and likely reduces [Formula: see text] (i.e., the aerobic contribution to exercise was lower) during running and cycling exercises ≤ 1 h across different environmental conditions (i.e., from 19 to 40 °C). Moreover, pre-exercise hypohydration possibly impedes [Formula: see text] during such exercises.

中文翻译：

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运动前水合对有氧运动表现，峰值耗氧量和乳酸阈下耗氧量的影响：荟萃分析的系统评价。

背景技术进行性运动诱发的脱水可能会损害有氧运动表现（AEP）。但是，还没有系统的方法来确定运动前的体液过少如何影响AEP及其相关成分，例如峰值耗氧量，该运动对生理学上的挑战不同于水合的运动前状态所带来的生理挑战。和[公式：参见文字]处于乳酸阈值[公式：参见文字]。目的采用荟萃分析的系统方法确定运动前水合作用对AEP的影响程度，[公式：参见文本]和[公式：参见文本]。设计这是一项对有良好对照的研究进行荟萃分析的系统评价。数据源MEDLINE，SPORTDiscus和CINAHL数据库以及交叉引用。选择研究的纳入标准：（1）严格控制的人类（≥18年）研究；（2）运动前至少1小时诱发运动前水合作用；（3）低水合实验条件下运动前的体重减轻要比水合良好的对照条件下≥1％和≥0.5％。（4）脱水方案后，对照条件下的体重变化在水合良好体重的-1％至+ 0.5％之内。结果总共纳入了15篇手稿，其中14项，6项和6项符合AEP的纳入标准，[公式：参见文字]和[公式：参见文字]，分别提供了21、10和9个效果估计，代表186个科目。平均体重下降为3.6±1.0％（范围1.7-5.6％）。研究中的平均AEP测试时间为22.3±13.5分钟（范围4.5-54.4分钟）。运动前水合作用使AEP降低2.4±0.8％（95％CI 0.8-4.0％），相对于控制条件。相对于对照条件，峰值耗氧量和[公式：参见文本]分别降低了2.4±0.8％（95％CI 0.7-4.0％）和4.4±1.4％（95％CI 1.7-7.1％）。与开始进行低水合运动相比，AEP，[公式：参见正文]和[公式：参见正文]分别有可能，有可能和有可能从运动前的水合状态中受益。荟萃回归分析并未在体重减轻的差异与AEP或[公式：参见文本]的百分比变化差异之间建立任何显着的关系。然而，发现每超过2.8％的体重减轻阈值，体重每减少百分之百，[公式：参见文本]就会减少2.6±0.8％（95％CI 0.7-4.5％）。结论运动前的体液过少可能损害AEP并可能降低[公式：参见文本]（即，在不同环境条件下（即19至40°C）≤1小时的跑步和自行车运动中，对运动的有氧贡献较低。此外，运动前的体液过少可能会阻碍这种运动。