Two nights of sleep deprivation with or without energy restriction does not impair the thermal response to cold

verfasst von

Samuel J. Oliver, Adam D. Harper Smith, Ricardo J.S. Costa, Norbert Maassen, James L.J. Bilzon, Neil P. Walsh

Abstract

Purpose: In persons completing exhaustive daily exercise, sleep and energy restriction have been highlighted as risk factors for hypothermia in cold environments. The present study therefore sought to determine the effect of sleep deprivation (SDEP), with and without energy restriction, on the thermal response to cold. Methods: In a random order, ten recreationally active men (mean ± SD: age 25 ± 6 years, body fat 17 ± 5 %) completed three 53 h trials: a control (CON: 436 min/night sleep), SDEP (0 min sleep), and sleep deprivation and energy restriction (SDEP + ER: 0 min sleep and 10 % daily energy requirements). Exhaustive exercise was completed after 5 and 29 h. After 53 h participants completed a semi-nude seated cold air test (CAT, 0 °C), for 4 h or until rectal core temperature (T_re) reached 36 °C. Results: Two nights of sleep and energy restriction did not impair the thermal response to cold (T_re, CON 36.15 ± 0.20 °C, SDEP 36.30 ± 0.15 °C, SDEP + ER 36.25 ± 0.20 °C, P = 0.25). Rewarming was also similar as indicated by 1 h post-CAT T_re (P = 0.78). In contrast, perceived thermal discomfort during the initial hour of the CAT tended to be greater after SDEP and SDEP + ER (P ≤ 0.1). Conclusion: Sleep and energy restriction, at least as evaluated within this experiment, should be considered minimal risk factors for hypothermia. The greater perception of cold discomfort at the same body temperature suggests that sleep and energy restriction may actually reduce cold injury risk, as people are likely to engage earlier in normal behavioral cold adaptation.

Organisationseinheit(en)

Institut für Sportwissenschaft

Externe Organisation(en)

Bangor University
Monash University
University of Bath

Typ

Artikel

Journal

European Journal of Applied Physiology

Band

115

Seiten

2059-2068

Anzahl der Seiten

10

ISSN

1439-6319

Publikationsdatum

22.10.2015

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Orthopädie und Sportmedizin, Öffentliche Gesundheit, Umwelt- und Arbeitsmedizin, Physiologie (medizinische)

Ziele für nachhaltige Entwicklung

SDG 3 – Gute Gesundheit und Wohlergehen

Elektronische Version(en)

https://doi.org/10.1007/s00421-015-3184-y (Zugang: Geschlossen)