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The purpose of this study was to validate a new interview-administered physical activity questionnaire (Assessment of Physical Activity in Frail Older People; APAFOP) in older people with and without cognitive impairment. The authors assessed feasibility, validity, and test-retest reliability in 168 people (n = 78 with, n = 88 without cognitive impairment). Concurrent validity was assessed against an inertia-based motion sensor and an established questionnaire. Sensitivity to change was tested in an ongoing study in patients with mild to moderate dementia (n = 81). Assessment of physical activity by the APAFOP and the motion sensor correlated well in the total sample (TS; p = .705), as well as in the subsamples with cognitive impairment (CI; p = .585) and without CI (p = .787). Excellent feasibility with an acceptance rate of 100%, test-retest reliability (intraclass correlation coefficients ranging from .973 (TS) to .975 (CI) to .966 (no CI), and sensitivity to change (effect sizes: 0.35-1.47) were found in both subsamples.

Original publication




Journal article


Journal of aging and physical activity

Publication Date





347 - 372


Bethanien-Krankenhaus-Geriatric Center, University of Heidelberg, Heidelberg, Germany.


Humans, Geriatric Assessment, Questionnaires, Feasibility Studies, Reproducibility of Results, Motor Activity, Mental Recall, Cognition Disorders, Psychometrics, Age Factors, Energy Metabolism, Aging, Aged, 80 and over, Statistics as Topic, Sedentary Lifestyle