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Sarcopenia was defined using slow gait speed and low hand grip strength. A 7-day 24-hour wrist accelerometry protocol quantified activity amount, intensity, endurance, and accumulation, with linear regression adjusted for age, sex, and body size and relevant mobility/strength measures. Sarcopenia related to reduced total activity and endurance.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/sarcopenia-and-digitally-measured-free-living-physical-activity-in-older-adults/426356/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/sarcopenia-and-digitally-measured-free-living-physical-activity-in-older-adults/426356.png","ImageObject",300,407,{"name":92,"@type":93},"Marglet","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-17","2026-09-29",true,{"@type":102,"interactionType":103,"userInteractionCount":52},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"How was sarcopenia defined at visit 9?","Question",{"text":112,"@type":113},"Sarcopenia at visit 9 was defined as slow gait speed (\u003C0.8 m/s) and low hand grip strength (\u003C20 kg for women, \u003C35.5 kg for men).","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What physical activity outcomes were derived from wrist accelerometry?",{"text":117,"@type":113},"The study summarized activity amount (total counts/day), intensity (mean counts in the five most active minutes/day), endurance (bouts lasting ≥10 minutes/day), and accumulation/fragmentation (%).",{"name":119,"@type":110,"acceptedAnswer":120},"Which activity dimensions were significantly associated with sarcopenia?",{"text":121,"@type":113},"After covariate adjustment, sarcopenia was associated with lower total activity and reduced endurance, while it was not associated with daily mean activity intensity or how activity was accumulated across the day.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},426356,1790765168,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":52,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":8,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":81},2336477982702,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","Innovation in Aging, 2025, Vol. 9, No. S2 361  \nage was 83 years, 58% were women, and 20%(n = 198) were classified as living with sarcopenia. After covariate adjustment, sarcopenia was associated with lower total activity (β=-21,8158 counts/d, SE = 60,436; p\u003C 0.001) and endurance (-24 minutes inactivity bouts ≥10 minutes, SE = 10; p = 0.02). Conversely, sarcopenia was not associated with daily mean activity intensity (p = 0.13) or the way daily activity was accumulated throughout the day (p = 0.18) . Results indicate that sarcopenia, above and beyond its individual components, is primarily associated with lower amounts of daily physical activity and endurance for movement related to everyday living. Our findings help define how sarcopenia connects to physical activity behavior in older adults and provides insight into potential preventative mechanisms.  \nAbstract citation ID: igaf122.1220  \nSARCOPENIA AND DIGITALLY MEASURED  \nFREE-LIVING PHYSICAL ACTIVITY IN  \nOLDER ADULTS  \nAmal Wanigatunga1, Lacey Etzkorn1, Brian Buta2, Sunan Gao2, Josef Coresh3, and Jennifer Schrack1, 1. Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States, 2. Johns Hopkins University, Baltimore, Maryland, United States, 3. New York University, New York, New York, United States  \nThis study examined the association between sarcopenia (age-related muscle mass and strength loss) with digitally measured free-living physical activity patterns—measures that summarize biological, physiological, behavioral, and environmental effects on mobility. Among 853 participants in the Atherosclerosis Risk in Communities (ARIC) Study, sarcopenia at visit 9 was defined as slow gait speed (\u003C0.8 m/s) and low hand grip strength (\u003C20 kg/women, \u003C35.5 kg/men) . Accelerometry was collected using a 7-day, 24-hour wrist-worn protocol and summarized into activity amount (total activity counts/d), intensity (mean activity counts in the consecutive five most active minutes/d), endurance (activity bouts lasting ≥10 minutes/d), and accumulation (physical activity fragmentation %) patterning metrics. Linear regression was used to estimate cross-sectional associations between sarcopenia and each physical activity metric adjusted for age, sex, body mass index, gait speed, and grip strength. Mean sample","cbCaicUy7OPc2UkS","https://ap.wps.com/l/cbCaicUy7OPc2UkS","pdf",371642,"English","# Methods\n## Study population and sarcopenia definition\n## Digital accelerometry metrics and adjustments\n# Results\n## Associations with activity amount and endurance\n## No associations with intensity or accumulation","[{\"question\":\"How was sarcopenia defined at visit 9?\",\"answer\":\"Sarcopenia at visit 9 was defined as slow gait speed (\\u003c0.8 m/s) and low hand grip strength (\\u003c20 kg for women, \\u003c35.5 kg for men).\"},{\"question\":\"What physical activity outcomes were derived from wrist accelerometry?\",\"answer\":\"The study summarized activity amount (total counts/day), intensity (mean counts in the five most active minutes/day), endurance (bouts lasting ≥10 minutes/day), and accumulation/fragmentation (%).\"},{\"question\":\"Which activity dimensions were significantly associated with sarcopenia?\",\"answer\":\"After covariate adjustment, sarcopenia was associated with lower total activity and reduced endurance, while it was not associated with daily mean activity intensity or how activity was accumulated across the day.\"}]","Sarcopenia and Digitally Measured Free-Living Physical Activity in Older Adults | PDF",1790640316]