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Differences between intention-to-treat arms in self-reported walking, sitting and other PA, averaged over the course of the trial, were derived from a linear regression model with log-transformed outcomes as a function of arm, adjusted for participant selection strata.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Pre-randomization mean age (79.7\u2009years), total recreational PA (11.6 MET-hours\/week), RAND-36 physical function score, and other characteristics did not differ between trial arms. Over a median 8.7\u2009years, Intervention participants reported higher average walking (3.2%), aerobic (3.4%), and total (3.7%) exercise, as MET-hours\/week, and strength training sessions per week (4.4%), and fewer hours\/week of sitting (1.5%) than Comparison (p\u2009&amp;lt;\u2009.001 for all). Intervention versus Comparison differences were greater for aerobic exercise (6.92%) and sitting (\u22122.48%) in the youngest age group (66\u2009\u2212\u200976) compared with other age groups (p &amp;lt;.001 and .02 for interaction , respectively).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>A 9-year \u201clight touch\u201d remotely-delivered PA intervention modestly attenuated age-related PA decreases and sitting time increases in older women. Building on the pragmatic WHISH PA intervention to augment behavioral changes, especially in adults aged over 80\u2009years, is an important direction for population health.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/gerona\/glag189","type":"journal-article","created":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T11:46:29Z","timestamp":1785498389000},"source":"Crossref","is-referenced-by-count":0,"title":["Physical activity and sitting over 9 years of the Women\u2019s Health Initiative Strong &amp; Healthy (\n                    <i>WHISH<\/i>\n                    ) randomized physical activity intervention trial in older women"],"prefix":"10.1093","volume":"81","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0284-6996","authenticated-orcid":false,"given":"Marcia L","family":"Stefanick","sequence":"first","affiliation":[{"name":"Department of Medicine (Stanford Prevention Research Center), School of Medicine, Stanford University , Stanford, 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