High-intensity exercise in the evening does not disrupt sleep in endurance runners
| Autor: | Craig Whitworth-Turner, Julien Louis, Craig Thomas, Helen Jones |
|---|---|
| Jazyk: | angličtina |
| Předmět: |
Adult
Male medicine.medical_specialty Evening Time Factors Sports medicine Physiology Polysomnography Heart rate Nocturnal Running RC1200 Young Adult Physiology (medical) Internal medicine medicine Heart rate variability Humans Orthopedics and Sports Medicine Exercise medicine.diagnostic_test business.industry Public Health Environmental and Occupational Health Actigraphy General Medicine Circadian Rhythm Before Bedtime Cardiology Physical Endurance Original Article business Sleep Sports |
| Zdroj: | European Journal of Applied Physiology |
| ISSN: | 1439-6327 |
| Popis: | Purpose To investigate the effect of early evening exercise training at different intensities on nocturnal sleep and cardiac autonomic activity in endurance-trained runners. Methods Eight runners completed three experimental trials in a randomised, counterbalanced order. In the early evening (end of exercise 3.5 h before bedtime), participants performed either: (i) a 1 h high-intensity interval running session (HIGH, 6 × 5 min at 90% VO2peak interspersed with 5 min recovery); (ii) a 1 h low-intensity running session (LOW, 60 min at 45% VO2peak) or (iii) no exercise (CON). Subsequent nocturnal sleep was assessed using polysomnography, wristwatch actigraphy, and subjective sleep quality. A two-lead electrocardiogram recorded nocturnal cardiac autonomic activity. Results Total sleep time increased after HIGH (477.4 ± 17.7 min, p = 0.022) and LOW (479.6 ± 15.6 min, p = 0.006) compared with CON (462.9 ± 19.0 min). Time awake was lower after HIGH (31.8 ± 18.5 min, p = 0.047) and LOW (30.4 ± 15.7 min, p = 0.008) compared with CON (46.6 ± 20.0 min). There were no differences between conditions for actigraphy and subjective sleep quality (p > 0.05). Nocturnal heart rate variability was not different between conditions, but average nocturnal heart rate increased after HIGH (50 ± 5 beats min−1) compared with LOW (47 ± 5 beats min−1, p = 0.02) and CON (47 ± 5 beats min−1, p = 0.028). Conclusion When performed in the early evening, high-intensity exercise does not disrupt and may even improve subsequent nocturnal sleep in endurance-trained runners, despite increased cardiac autonomic activity. Additionally, low-intensity exercise induced positive changes in sleep behaviour that are comparable to those obtained following high-intensity exercise. |
| Databáze: | OpenAIRE |
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