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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.

Type

Journal article

Journal

J Aging Phys Act

Publication Date

10/2011

Volume

19

Pages

347 - 372

Keywords

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