title: The effect of 60-h sleep deprivation on cardiovascular regulation and body temperature.
abstract: This study examined cardiovascular regulation and body temperature (BT) during 60 h of sleep deprivation in 20 young healthy cadets. Heart rate variability was measured during an active orthostatic test (AOT). Measurements were performed each day in the morning and evening after 2, 14, 26, 38, 50 and 60 h of sleep deprivation. In AOT, in the sitting and standing positions, heart rate decreased (P < 0.001), while high frequency and low frequency power increased (P < 0.05-0.001) during sleep deprivation. Body temperature also decreased (P < 0.001), but no changes were detected in blood pressure. In conclusion, the accumulation of 60 h of sleep loss resulted in increased vagal outflow, as evidenced by decreased heart rate. In addition, BT decreased during sleep deprivation. Thus, sleep deprivation causes alterations in autonomic regulation of the heart, and in thermoregulation.
authors.affiliation: Department of Biology of Physical Activity, University of Jyväskylä, Jyväskylä, Finland. jani.vaara@sport.jyu.fi
authors.forename: Jani
authors.initials: J
authors.lastname: Vaara
authors.forename: Heikki
authors.initials: H
authors.lastname: Kyröläinen
authors.forename: Mikko
authors.initials: M
authors.lastname: Koivu
authors.forename: Mikko
authors.initials: M
authors.lastname: Tulppo
authors.forename: Taija
authors.initials: T
authors.lastname: Finni
mesh_terms: D000328:Adult; D001341:Autonomic Nervous System / Q000503:physiopathology; D001794:Blood Pressure; D001831:Body Temperature; D001833:Body Temperature Regulation; D002319:Cardiovascular System / Q000503:physiopathology*; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D011187:Posture; D012892:Sleep Deprivation / Q000097:blood / Q000503:physiopathology*