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July 8, 2025Scientific ReportsOpen Access

Moderate-intensity continuous exercise preserves sleep quality, while high-intensity intermittent exercise disrupts it in female night-shift healthcare workers

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Why the study?

The effects of a single bout of moderate-intensity continuous exercise versus high-intensity intermittent exercise on sleep in inactive female healthcare workers with mild sleep impairment during night shifts were unknown.

Does a single bout of moderate-intensity continuous exercise or high-intensity intermittent exercise improve sleep quality in inactive female night-shift healthcare workers?

Population

14 inactive female healthcare workers with mild sleep impairment during continuous night-shifts

Comparison

MICE vs HIIE vs quiet-rest control

Design

Randomized trial

Follow-up

3 sleeps after exercise

Authors

SWShih-Hao WuChina Medical UniversityWCWan‐Ju ChengNational Health Research InstitutesLCLi-Jung ChenNational Taiwan University of Sport

Discussion

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Implication

Prefer single-bout MICE over HIIE to protect sleep in night-shift workers; first head-to-head RCT, leaves chronic exercise effects open.

Structured PICO

Does a single bout of moderate-intensity continuous exercise or high-intensity intermittent exercise improve sleep quality in inactive female night-shift healthcare workers?

P
Population
14 inactive female healthcare workers with mild sleep impairment (AIS-5 > 5 or sleep efficiency < 85%) working at least three consecutive 8-hour night-shifts, mean age 31.8, 100% female, from Taiwan.
I
Intervention
Single bout of moderate-intensity continuous exercise (MICE) (70-75% of maximum heart rate for 47 min) OR high-intensity intermittent exercise (HIIE) (90-95% of maximum heart rate for 4 min and 50-70% for 3 min, for 4 rounds, total 28 min), performed 14 hours before a continuous night shift.
C
Comparator
Quiet-rest control (reading books and newspapers) 14 hours before a continuous night shift.
O
Outcome
Subjective and objective sleep quality (assessed by a single question score and ActiGraph for one night before and 3 sleeps after exercise).patient reported

A single session of moderate-intensity continuous exercise preserves subjective sleep quality in female night-shift healthcare workers, whereas high-intensity intermittent exercise disrupts sleep maintenance.

Cite This Study

Wu et al. (2025) studied this question.

synapsesocial.com/papers/6a7f80fa8cb2fb2788a6f784https://doi.org/10.1038/s41598-025-09404-1
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