Use of accelerometry to quantify the physical activity level of the elderly

Kelly L. Gao, Wai Nam Tsang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)


This study investigated the reliability and validity of using an accelerometry system to quantify the physical activity level of Chinese elderly subjects. Thirty-eight volunteers wore an accelerometer for 3 days. Test-retest reliability, the sensitivity of the measurements, and the correlation between the results and the results of a commonly used physical activity questionnaire were measured. The accelerometry system was found to be reliable (intraclass correlation coefficient, 0.978). The system was able to differentiate young adults and active elderly from sedentary elderly subjects (p<0.001).The results showed a moderate but significant correlation with scores on the questionnaire (r=0.830; p<0.001). The accelerometry system can be used as an objective tool to quantify the physical activity level of the elderly, specifically Chinese subjects.
Original languageEnglish
Pages (from-to)18-23
Number of pages6
JournalHong Kong Physiotherapy Journal
Issue number1
Publication statusPublished - 1 Jan 2008


  • Health
  • Motion sensors
  • Older adults
  • Physical activity level

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this