title: Quantification of everyday motor function in a geriatric population.
abstract: This pilot study evaluated variability in physical activities and the correlations between walking, two types of postural transitions, and falls efficacy with an ambulatory activity monitor. An 11-subject convenience sample wore the monitor for 2 consecutive days; in addition, 7 subjects carried the monitor on 1 day of the following week. Demographic characteristics of the sample were age: mean +/- standard deviation [SD] = 87.8 +/- 2.5 yr, body mass index: mean +/- SD = 25.3 +/- 2.1 kg/m(2), and Mini-Mental State Examination score: mean +/- SD = 27.5 +/- 2.0. Analyzed movements were sit-to-stand (SiSt) and stand-to-sit postural transitions, dynamic activity (walking), and static behavior (sitting, standing, lying). Significant correlations were found for the SiSt transition duration (TD) between days (intraclass correlation coefficient = 0.78). No differences were found between the durations of sitting (p = 0.8), lying (p = 0.72), standing (p = 0.06), and walking (p = 0.6). These parameters showed highly variable correlation coefficients. A significant correlation was observed between falls efficacy and SiSt measures (r = 0.84, p < 0.01, df = 9). We reliably determined the SiSt TD after subjects wore the monitor for 1 day in the home environment. Poor correlations between 2 consecutive measurement days for dynamic and static activity underline the necessity of recording further days to assess physical activity levels in the geriatric population.
authors.affiliation: Institute of Human Movement Sciences and Sport, ETH Zürich, Zürich, Switzerland. debruin@move.biol.ethz.ch
authors.forename: Eling D
authors.initials: ED
authors.lastname: de Bruin
authors.forename: Bijan
authors.initials: B
authors.lastname: Najafi
authors.forename: Kurt
authors.initials: K
authors.lastname: Murer
authors.forename: Daniel
authors.initials: D
authors.lastname: Uebelhart
authors.forename: Kamiar
authors.initials: K
authors.lastname: Aminian
mesh_terms: D000203:Activities of Daily Living; D000369:Aged, 80 and over; D004185:Disability Evaluation; D005260:Female; D005500:Follow-Up Studies; D020233:Gait Disorders, Neurologic / Q000503:physiopathology / Q000534:rehabilitation*; D015577:Geriatric Assessment / Q000379:methods*; D006801:Humans; D008297:Male; D008991:Monitoring, Physiologic / Q000379:methods*; D009043:Motor Activity / Q000502:physiology*; D010865:Pilot Projects; D004856:Postural Balance / Q000502:physiology; D011788:Quality of Life; D016896:Treatment Outcome