title: [Influence of sleep habit and nocturnal lifestyle on circadian rhythm of blood pressure among workers in Okinawa].
abstract: We estimated the influence of sleep habit and nocturnal lifestyle on circadian rhythm of blood pressure by use of ambulatory blood pressure monitoring (ABPM) and self-estimating questionnaire formats. A total of 30 workers aged 21 to 58 years old voluntarily participated. None had any chronic diseases or regular medication. The average subject daily worked for 8 hours, waked-up at 6:00, went-to-bed at 23:45, and had 6.25-hour sleep (median). The subjects were divided into 3 groups according to % dipping of sleep blood pressure; 10 to 20% dipping as a dipper, <10% as a non-dipper, and > or = 20% as an extreme-dipper. This characterization resulted in 15 dippers (50%), 8 non-dippers(27%) and 7 extreme-dippers (23%). Of the parameters estimated, (1) sleeping hours of non-dippers were significantly shorter than those of dippers (p=0.02), (2) nighttime blood pressure of extreme-dippers were significantly lower than dippers (p=0.04), (3) the lowest blood pressure in nighttime of non-dippers were significantly higher when compared with the remaining 2 groups, (4) morning surges of blood pressure of non-dippers were the significantly smallest, whereas those of extreme-dippers were the greatest, and (5)refreshing scores of OSA sleep inventory MA version of non-dippers were significantly poorer when compared to extreme-dippers. This study could indicate the significant influence of nocturnal lifestyle with short sleep on circadian rhythm of blood pressure, and the extended prospective-study might be promising for a precise conclusion.
authors: Clinical Laboratories, University Hospital of the Ryukyus, Nakagami-gun, Okinawa-pref. 903-0215, Japan. mayo@med.u-ryukyu.ac.jp
authors: Mayo
authors: M
authors: Sugawara
authors: Yasushi
authors: Y
authors: Higashiuesato
authors: Nobuhisa
authors: N
authors: Yamane
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000502:physiology*; D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D006184:Habits; D006801:Humans; D006973:Hypertension / Q000503:physiopathology; D007564:Japan; D008019:Life Style; D008297:Male; D008875:Middle Aged; D012890:Sleep / Q000502:physiology*; D055815:Young Adult