Trial reportIndustrial health2014
Effects of two 15-min naps on the subjective sleepiness, fatigue and heart rate variability of night shift nurses.
Trial report in Industrial health, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers, 2 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
19 citing papers in PubMed, 2 syntheses or guidelines pooled it, 51 citations in OpenAlex.
- Work-break schedules for preventing musculoskeletal symptoms and disorders in healthy workers.The Cochrane database of systematic reviews · 2019Pooled it
- Person-directed, non-pharmacological interventions for sleepiness at work and sleep disturbances caused by shift work.The Cochrane database of systematic reviews · 2016Pooled it
- Trial
- Silent practices becoming norms: planned napping for nurses during intensive care night shifts - a focus group study.Journal of research in nursing : JRN · 2026Article
- Article
- Effects of programs on sleep improvement in shift-work nurses: a systematic review and meta-analysis.BMC nursing · 2025Article
- Review
- Effects of 90- and 30-min naps or a 120-min nap on alertness and performance: reanalysis of an existing pilot study.Scientific reports · 2023Article
- Effects of 90 Min Napping on Fatigue and Associated Environmental Factors among Nurses Working Long Night Shifts: A Longitudinal Observational Study.International journal of environmental research and public health · 2022Observational
- Cardiac Autonomic Control and Neural Arousal as Indexes of Fatigue in Professional Bus Drivers.Safety and health at work · 2022Article
- Heart rate variability and heart rate monitoring of nurses using PPG and ECG signals during working condition: A pilot study.Health science reports · 2022Article
- A quasi-experimental study into the effects of naps and therapy glasses on fatigue and well-being.Journal of nursing management · 2021Article
- Sleep-Related Problems in Night Shift Nurses: Towards an Individualized Interventional Practice.Frontiers in human neuroscience · 2021Article
- Assessing Workplace Stress Among Nurses Using Heart Rate Variability Analysis With Wearable ECG Device-A Pilot Study.Frontiers in public health · 2021Article
- Symptom Cluster of ICU Nurses Treating COVID-19 Pneumonia Patients in Wuhan, China.Journal of pain and symptom management · 2020Article
- Methods in Experimental Work Break Research: A Scoping Review.International journal of environmental research and public health · 2019Article
- Non-Image Forming Effects of Light on Brainwaves, Autonomic Nervous Activity, Fatigue, and Performance.Journal of circadian rhythms · 2018Article
- The Concept of Qailulah (Midday Napping) from Neuroscientific and Islamic Perspectives.Journal of religion and health · 2018Review
- Using relaxation techniques to improve sleep during naps.Industrial health · 2018Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The purpose of this study was to examine the effects of two 15-min naps on nurses who work at night in a three-shift system. Of the 15 nurses who were included as study subjects on a night shift, eight took two short naps (the Nap condition), and seven worked without taking a nap (the No-nap condition) during the night shift. We measured sublingual temperature and the bispectral index (BIS), obtained heart rate and heart rate variability measures from an electrocardiogram (ECG), and evaluated sleepiness and fatigue levels every hour using the Visual Analog Scale (VAS). Both subjective sleepiness and fatigue increased between 4:00 and 5:00, with no significant differences observed between the two groups. However, the low- to high-frequency ratio (LF/HF) in the Nap condition group was found to be significantly lower than in the No-nap condition group. Furthermore, a sudden, brief increase in HF values was observed in the No-nap condition group in the morning. The results of this study suggest that taking two short naps may effectively reduce tension and prevent a brief increase in HF values by suppressing sympathetic nervous activity in the morning.
Indexed as
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.