title: The influence of day and night work on the circadian variations of cardiovascular performance.
abstract: Circadian variations of the pre-ejection period, Q-T interval, heart rate and oral temperature at rest and in day and night shift work were investigated. At rest, pronounced circadian variation was found in heart rate, pre-ejection period and Q-T interval. The ratio between Q-T interval and heart rate also shows a distinct circadian variation. When working, the rest rhythms of the variables were obscured. The physiological implications for shift work are discussed.
mesh_terms: D000293:Adolescent; D000328:Adult; D001831:Body Temperature; D002940:Circadian Rhythm; D006339:Heart Rate; D006801:Humans; D008297:Male; D009200:Myocardial Contraction; D012146:Rest; D014937:Work