The aim of this study was to evaluate the acute and adaptive effects of passive extreme heat (100 ± 3 °C) exposition in combination with a strength training protocol on maximal isometric handgrip strength. Fifty-four untrained male university students participated in this investigation. Twenty-nine formed the control group (NG) and 25 the heat-exposed group (HG). All the participants performed a 3-week isotonic handgrip strength training program twice a week with a training volume of 10 series of 10 repetitions with 45-s rest between series, per session. All the subjects only trained their right hand, leaving their left hand untrained. HG performed the same training protocol in hot (100 ± 3 °C) conditions in a dry sauna. Maximal isometric handgrip strength was evaluated each training day before and after the session. NG participants did not experience any modifications in either hand by the end of the study while HG increased maximal strength values in both hands (p < 0.05), decreased the difference between hands (p < 0.05), and recorded higher values than the controls in the trained (p < 0.05) and untrained (p < 0.01) hands after the intervention period. These changes were not accompanied by any modification in body composition in either group. The performance of a unilateral isotonic handgrip strength program in hot conditions during the three weeks induced an increase in maximal isometric handgrip strength in both hands without modifications to bodyweight or absolute body composition.

中文翻译：

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极热条件下握力训练对年轻男性握力最大等距力量发展的影响

这项研究的目的是评估被动极热（100±3°C）暴露与针对最大等距握力的力量训练方案相结合的急性和适应性影响。五十四名未经训练的男大学生参加了这项调查。29个为对照组（NG），25个为热暴露组（HG）。所有参与者每周进行两次为期3周的等渗手握力量训练计划，训练量为10组，每组10次重复，每组之间休息45 s。所有受试者仅训练右手，而未训练左手。HG在干燥桑拿房中的高温（100±3°C）条件下执行相同的训练方案。在训练前和训练后的每一天都评估了最大的等距握力。p < 0.05），减少了双手之间的差异（p < 0.05），并且在干预期之后，记录的值高于经过训练的手（p < 0.05）和未经训练的手（p < 0.01）。这些变化在两组中均未伴随身体成分的任何改变。在三周的炎热条件下执行单方面等渗握力程序会导致两只手的最大等轴测握力增加，而无需改变体重或绝对的身体组成。