{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,11]],"date-time":"2026-06-11T04:06:51Z","timestamp":1781150811281,"version":"3.54.1"},"reference-count":33,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2020,3,28]],"date-time":"2020-03-28T00:00:00Z","timestamp":1585353600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Paul-Kuth-Stiftung (Wuppertal)","award":["X"],"award-info":[{"award-number":["X"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Applicable and accurate assessment methods are required for a clinically relevant quantification of habitual physical activity (PA) levels and sedentariness in older adults. The aim of this study is to compare habitual PA and sedentariness, as assessed with (1) a wrist-worn actigraph, (2) a hybrid motion sensor attached to the lower back, and (3) a self-estimation based on a questionnaire. Over the course of one week, PA of 58 community-dwelling subjectively healthy older adults was recorded. The results indicate that actigraphy overestimates the PA levels in older adults, whereas sedentariness is underestimated when compared to the hybrid motion sensor approach. Significantly longer durations (hh:mm\/day) for all PA intensities were assessed with the actigraph (light: 04:19; moderate to vigorous: 05:08) when compared to the durations (hh:mm\/day) that were assessed with the hybrid motion sensor (light: 01:24; moderate to vigorous: 02:21) and the self-estimated durations (hh:mm\/day) (light: 02:33; moderate to vigorous: 03:04). Actigraphy-assessed durations of sedentariness (14:32 hh:mm\/day) were significantly shorter when compared to the durations assessed with the hybrid motion sensor (20:15 hh:mm\/day). Self-estimated duration of light intensity was significantly shorter when compared to the results of the hybrid motion sensor. The results of the present study highlight the importance of an accurate quantification of habitual PA levels and sedentariness in older adults. The use of hybrid motion sensors can offer important insights into the PA levels and PA types (e.g., sitting, lying) and it can increase the knowledge about mobility-related PA and patterns of sedentariness, while actigraphy appears to be not recommendable for this purpose.<\/jats:p>","DOI":"10.3390\/s20071877","type":"journal-article","created":{"date-parts":[[2020,4,1]],"date-time":"2020-04-01T03:44:13Z","timestamp":1585712653000},"page":"1877","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Quantifying Habitual Physical Activity and Sedentariness in Older Adults\u2014Different Outcomes of Two Simultaneously Body-Worn Motion Sensor Approaches and a Self-Estimation"],"prefix":"10.3390","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7091-4583","authenticated-orcid":false,"given":"Rieke","family":"Trumpf","sequence":"first","affiliation":[{"name":"Institute of Movement and Sport Gerontology, German Sport University Cologne, 50933 Cologne, Germany"},{"name":"Department of Geriatric Psychiatry &amp; Psychotherapy, LVR-Hospital Cologne, 51109 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wiebren","family":"Zijlstra","sequence":"additional","affiliation":[{"name":"Institute of Movement and Sport Gerontology, German Sport University Cologne, 50933 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Haussermann","sequence":"additional","affiliation":[{"name":"Department of Geriatric Psychiatry &amp; Psychotherapy, LVR-Hospital Cologne, 51109 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tim","family":"Fleiner","sequence":"additional","affiliation":[{"name":"Institute of Movement and Sport Gerontology, German Sport University Cologne, 50933 Cologne, Germany"},{"name":"Department of Geriatric Psychiatry &amp; Psychotherapy, LVR-Hospital Cologne, 51109 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2020,3,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"45","DOI":"10.1016\/S0140-6736(14)60648-6","article-title":"Prevention of chronic disease in the 21st century: Elimination of the leading preventable causes of premature death and disability in the USA","volume":"384","author":"Bauer","year":"2014","journal-title":"Lancet"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"359","DOI":"10.1159\/000094985","article-title":"Mobility limitations and cognitive deficits as predictors of institutionalization among community-dwelling older people","volume":"52","author":"Rantanen","year":"2006","journal-title":"Gerontology"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"883","DOI":"10.1111\/j.1532-5415.2000.tb06884.x","article-title":"Physical activity, falls, and fractures among older adults: A review of the epidemiologic evidence","volume":"48","author":"Gregg","year":"2000","journal-title":"J. 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