Ultra-trail endurance racing causes objective sleep disruptions lasting up to four nights post-race, despite only modest subjective sleep complaints.
In a field study of 18 ultra-trail runners, actigraphy revealed significant objective sleep changes including reduced sleep efficiency, longer nocturnal wake time, increased awakenings, and increased wake after sleep onset, persisting up to four nights after the race. Subjective sleep alterations were modest, mainly later wake-up time and reduced sleep quality on the night following the race.
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Ultra-trail endurance racing causes objective sleep disruptions lasting up to four nights post-race, despite only modest subjective sleep complaints. The current body of evidence comprises 1 study. EvidenceHub rates the overall confidence at 32/100 (low).
The Claim
Ultra-trail endurance racing causes objective sleep disruptions lasting up to four nights post-race, despite only modest subjective sleep complaints.
This conclusion is most relevant to: 18 athletes (mean age 34.6 ± 8.13, 3 women) participating in the Ultra Marathon des Cirques, La Réunion, France.
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Sleep disturbances after an ultra-trail endurance race: a field study. (Sleep medicine: X, 2026) —
How It Works
The proposed biological pathway:
- ▸Ultra-trail race induces sleep deprivation, cumulative fatigue, hypoxia, and hyperthermia
- ▸These factors may disrupt normal sleep architecture
- ▸Resulting in sleep fragmentation and reduced sleep efficiency
- ▸Objective sleep disruptions persist up to four nights post-race
Who Might Benefit
Evidence fit by population:
- ▸18 athletes (mean age 34.6 ± 8.13, 3 women) participating in the Ultra Marathon des Cirques, La Réunion, France
Recommended Dose
N/A
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Small sample size (n=18) with only 3 women, limiting generalizability
- ▸Observational field study without a control group, so causal inference is limited
- ▸Potential confounding factors such as individual training status, race experience, and environmental conditions were not fully controlled
Frequently Asked Questions
How long do sleep disturbances last after an ultra-trail race?▼
Objective sleep disruptions, including reduced sleep efficiency and increased fragmentation, can persist for up to four nights after the race, according to actigraphy measurements.
Do athletes perceive sleep disturbances after an ultra-trail race?▼
Athletes reported only modest subjective sleep alterations, mainly a later wake-up time and reduced sleep quality on the night following the race, despite objective disruptions.
What are the main objective sleep changes observed after an ultra-trail race?▼
Actigraphy showed reduced sleep efficiency, longer nocturnal wake time, increased number of awakenings, and increased wake after sleep onset, lasting up to four nights post-race.
What factors might explain sleep disruptions after an ultra-trail race?▼
Potential mechanisms include sleep deprivation, cumulative fatigue, hypoxia, and hyperthermia, though the exact mechanisms remain to be elucidated.
References
- 1.Fachan F, Vilcourt F, Lemarchand B, Chouchou F. “Sleep disturbances after an ultra-trail endurance race: a field study..” Sleep medicine: X, 2026. PMID: 42571451 DOI: 10.1016/j.sleepx.2026.100197