{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T20:52:02Z","timestamp":1784062322547,"version":"3.55.0"},"reference-count":30,"publisher":"Oxford University Press (OUP)","issue":"12","license":[{"start":{"date-parts":[[2018,11,15]],"date-time":"2018-11-15T00:00:00Z","timestamp":1542240000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"name":"Finnish Ministry of Education and Culture","award":["OKM\/56\/626\/2013"],"award-info":[{"award-number":["OKM\/56\/626\/2013"]}]},{"DOI":"10.13039\/501100002341","name":"Academy of Finland","doi-asserted-by":"publisher","award":["265240"],"award-info":[{"award-number":["265240"]}],"id":[{"id":"10.13039\/501100002341","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002341","name":"Academy of Finland","doi-asserted-by":"publisher","award":["263278"],"award-info":[{"award-number":["263278"]}],"id":[{"id":"10.13039\/501100002341","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002341","name":"Academy of Finland","doi-asserted-by":"publisher","award":["308248"],"award-info":[{"award-number":["308248"]}],"id":[{"id":"10.13039\/501100002341","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002341","name":"Academy of Finland","doi-asserted-by":"publisher","award":["312073"],"award-info":[{"award-number":["312073"]}],"id":[{"id":"10.13039\/501100002341","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003125","name":"Finnish Cultural Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100003125","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100010114","name":"Yrj\u00f6 Jahnsson Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100010114","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Turku University Foundation"},{"DOI":"10.13039\/501100008320","name":"Finnish Brain Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100008320","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2019,11,13]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec>\n                  <jats:title>Background<\/jats:title>\n                  <jats:p>Maintaining good fitness and good level of physical activity are important factors for maintaining physical independence later in life. The aim was to investigate the relationship between self-reported fitness and objectively measured physical activity and sedentary behavior in the elderly.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>Same-sex twin pairs born 1940\u20131944 in Finland were invited to the study. Altogether 787 individuals (mean age 72.9 years), of whom 404 were female, used a hip-worn triaxial accelerometer for at least 4 days and answered a question on perceived fitness. First, individual differences were studied between four fitness categories. Second, pairwise differences were examined among twin pairs discordant for fitness.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>Self-reported fitness explained moderately the variation in objectively measured physical activity parameters: R2 for daily steps 26%, for daily mean metabolic equivalent 31%, for daily moderate-to-vigorous activity time 31%, and lower for sedentary behavior time 14% (all p &lt; .001). Better self-reported fitness was associated with more steps taken on average (8,558 daily steps [very good fitness] vs 2,797 steps [poor fitness], p &lt; .001) and with a higher amount of moderate-to-vigorous activity (61 min vs 12 min p &lt; .001, respectively) in the adjusted multivariable model. Among 156 twin pairs discordant for self-reported fitness, co-twins with better fitness took more steps, did more moderate-to-vigorous activity, and had less sedentary behavior (all, p &lt; .05) compared to their less fit co-twins; however, difference was smaller among monozygotic than dizygotic pairs.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusion<\/jats:title>\n                  <jats:p>One simple question on self-reported fitness is associated with daily activity profile among community-dwelling older people. However, genetic factors modulate this association to some extent.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1093\/gerona\/gly263","type":"journal-article","created":{"date-parts":[[2018,11,15]],"date-time":"2018-11-15T01:14:48Z","timestamp":1542244488000},"page":"1965-1972","source":"Crossref","is-referenced-by-count":12,"title":["Self-reported Fitness and Objectively Measured Physical Activity Profile Among Older Adults: A Twin Study"],"prefix":"10.1093","volume":"74","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0121-249X","authenticated-orcid":false,"given":"Katja","family":"Waller","sequence":"first","affiliation":[{"name":"Faculty of Sport and Health Sciences, University of Jyv\u00e4skyl\u00e4, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Henri","family":"V\u00e4h\u00e4-Ypy\u00e4","sequence":"additional","affiliation":[{"name":"The UKK Institute for Health Promotion Research, Tampere, 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