Quantification of everyday motor function in a geriatric population

Eling D. De Bruin, Bijan Najafi, Kurt Murer, Daniel Uebelhart, Kamiar Aminian

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


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/m2, 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.

Original languageEnglish (US)
Pages (from-to)417-428
Number of pages12
JournalJournal of Rehabilitation Research and Development
Issue number3
StatePublished - 2007
Externally publishedYes


  • Activity of daily living monitoring
  • Ambulatory activity monitor
  • Correlations
  • Falls efficacy
  • Mobility disability
  • Physical activity assessment
  • Postural transitions
  • Rehabilitation
  • Sit-to-stand
  • Stand-to-sit

ASJC Scopus subject areas

  • Rehabilitation


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