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Purpose <p>To investigate the effect of repeated-sprint exercise in hypoxia on sleep quality.</p> Methods <p>Ten healthy young male adults performed three trials on different days: repeated-sprint exercise in normoxia (NOR, fraction of inspired oxygen [FiO<sub>2</sub>] 20.9%), repeated-sprint exercise in hypoxia (HYP, FiO<sub>2</sub> 14.5%), and no exercise in normoxia (REST, FiO<sub>2</sub> 20.9%). In NOR and HYP, trials were performed between 4:30 PM and 6:00 PM, consisting of 30&#xa0;min of submaximal pedaling followed by two sets of repeated sprints (6 × 6-s with 30-s rest). During sleep, heart rate (HR), HR variability (<i>e.g.,</i> the percentage of adjacent R-R intervals &gt; 50&#xa0;ms [pNN50]), skin temperature were monitored and sleep quality was assessed via electroencephalography.</p> Results <p>Total sleep time, sleep efficiency, sleep latency, duration of each sleep stage (non-REM [sleep stage without rapid eye movement] stages 1–3, REM) did not significantly differ among the three trials. During the first 90&#xa0;min of sleep, HR was significantly higher in HYP (53 ± 2&#xa0;bpm) than in REST (49 ± 1&#xa0;bpm,<i> P</i> &lt; 0.05). Furthermore, pNN50 was significantly lower in both HYP (48.8 ± 4.8%) and NOR (50.4 ± 4.9%) than in REST (58.3 ± 3.6%, <i>P</i> &lt; 0.05).</p> Conclusion <p>Performing repeated-sprint exercise in hypoxia in the early evening altered HRV-derived indices during the first 90&#xa0;min of sleep, without markedly affecting sleep quality.</p>

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Repeated-sprint exercise in hypoxia does not alter sleep quality in young male adults

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  • 发表日期：

    2026年8月1日

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  • Hikaru Matsudo,
  • Tomotaka Natsui,
  • Franck Brocherie,
  • Kazushige Goto

摘要

Purpose

To investigate the effect of repeated-sprint exercise in hypoxia on sleep quality.

Methods

Ten healthy young male adults performed three trials on different days: repeated-sprint exercise in normoxia (NOR, fraction of inspired oxygen [FiO2] 20.9%), repeated-sprint exercise in hypoxia (HYP, FiO2 14.5%), and no exercise in normoxia (REST, FiO2 20.9%). In NOR and HYP, trials were performed between 4:30 PM and 6:00 PM, consisting of 30 min of submaximal pedaling followed by two sets of repeated sprints (6 × 6-s with 30-s rest). During sleep, heart rate (HR), HR variability (e.g., the percentage of adjacent R-R intervals > 50 ms [pNN50]), skin temperature were monitored and sleep quality was assessed via electroencephalography.

Results

Total sleep time, sleep efficiency, sleep latency, duration of each sleep stage (non-REM [sleep stage without rapid eye movement] stages 1–3, REM) did not significantly differ among the three trials. During the first 90 min of sleep, HR was significantly higher in HYP (53 ± 2 bpm) than in REST (49 ± 1 bpm, P < 0.05). Furthermore, pNN50 was significantly lower in both HYP (48.8 ± 4.8%) and NOR (50.4 ± 4.9%) than in REST (58.3 ± 3.6%, P < 0.05).

Conclusion

Performing repeated-sprint exercise in hypoxia in the early evening altered HRV-derived indices during the first 90 min of sleep, without markedly affecting sleep quality.