title: Day-to-day variability of physical activity of older adults living in the community.
abstract: The purpose of the study was to investigate whether a 24-hr recording period is sufficient to describe physical activity (PA) of 1 week for intraindividual comparison in older adults. Furthermore, the authors analyzed whether physical performance can be used as a surrogate marker of PA. PA was captured on 7 consecutive days by a body-fixed sensor in 44 community-dwelling older adults (80.75 +/- 4.05 yr). Mean times of walking and of "time on feet" of the group were 10.2 hr (+/- 3.5) and 35.1 hr (+/- 9.43), respectively. Intraindividual variabilities of walking and of time on feet were 31.9% +/- 10.79% and 19.4% +/- 8.76%, respectively. Accumulated time of variables of PA showed no differences between weekdays, with variabilities of 3.8% and 1.8% for walking and time on feet, respectively. Association between Short Physical Performance Battery and PA was limited (walking r = .397, time on feet r = .41).
authors.affiliation: Dept. of Clinical Gerontology, Robert Bosch Hospital, Stuttgart, Germany.
authors.forename: Simone
authors.initials: S
authors.lastname: Nicolai
authors.forename: Petra
authors.initials: P
authors.lastname: Benzinger
authors.forename: Dawn A
authors.initials: DA
authors.lastname: Skelton
authors.forename: Kamiar
authors.initials: K
authors.lastname: Aminian
authors.forename: Clemens
authors.initials: C
authors.lastname: Becker
authors.forename: Ulrich
authors.initials: U
authors.lastname: Lindemann
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D015577:Geriatric Assessment; D015438:Health Behavior; D006801:Humans; D008297:Male; D009043:Motor Activity; D016138:Walking