What question did this study set out to answer?

To investigate the association between nocturnal core body temperature dynamics and objective sleep characteristics in elite swimmers.

August 19, 2026Temperature

Early-night core body temperature decline is associated with sleep fragmentation and early-night slow-wave sleep duration in elite swimmers

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Authors

EMEmma MilotInserm QBQuentin BretonneauUniversité de Poitiers BDBenoît DuguéUniversité de Poitiers

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Implication

Observational study finds early-night core body temperature decline reduces sleep fragmentation and lengthens deep sleep in elite swimmers, indicating optimal windows for cooling interventions.

Key Points

To investigate the association between nocturnal core body temperature dynamics and objective sleep characteristics in elite swimmers.
Monitored 26 elite swimmers (42% women, aged 17 ± 1 years) across a single night using an ingestible core thermometer, a connected headband, and a wrist accelerometer.
Retrospectively categorized athletes into high- and low-temperature delta groups based on the magnitude of core body temperature decrease between 1 hour before and 4 hours after lights-out.
The high temperature delta group experienced greater core temperature decline, significantly longer slow-wave sleep during the first two cycles, earlier onset of the first sleep cycle, longer REM latency, and reduced sleep fragmentation compared to the low delta group.
Higher core body temperature at the start of the night correlated with shorter slow-wave sleep duration in early cycles and increased sleep fragmentation, whereas subjective sleep ratings showed no significant group differences.

Cite This Study

Milot et al. (2026) studied this question.

synapsesocial.com/papers/6a85639d03308d306e2d6ebf https://doi.org/10.1080/23328940.2026.2717072

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Implication

Observational study finds early-night core body temperature decline reduces sleep fragmentation and lengthens deep sleep in elite swimmers, indicating optimal windows for cooling interventions.

Early-night core body temperature decline is associated with sleep fragmentation and early-night slow-wave sleep duration in elite swimmers

Discussion

Member takes

Implication

Key Points

Cite This Study

Early-night core body temperature decline is associated with sleep fragmentation and early-night slow-wave sleep duration in elite swimmers

Discussion

Member takes

Implication

Key Points

Cite This Study

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