{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T22:15:03Z","timestamp":1790720103287,"version":"4.1.0"},"reference-count":42,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2025,4,25]],"date-time":"2025-04-25T00:00:00Z","timestamp":1745539200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Institute on Aging (NIA)","award":["R01 AG059416"],"award-info":[{"award-number":["R01 AG059416"]}]},{"name":"National Institute on Aging (NIA)","award":["P30 AG024827"],"award-info":[{"award-number":["P30 AG024827"]}]},{"name":"National Institute on Aging (NIA)","award":["P30 AG021332"],"award-info":[{"award-number":["P30 AG021332"]}]},{"name":"National Institute on Aging (NIA)","award":["UL1 TR001420"],"award-info":[{"award-number":["UL1 TR001420"]}]},{"name":"NIA Claude D. Pepper Older American Independence Centers at University of Pittsburgh","award":["R01 AG059416"],"award-info":[{"award-number":["R01 AG059416"]}]},{"name":"NIA Claude D. Pepper Older American Independence Centers at University of Pittsburgh","award":["P30 AG024827"],"award-info":[{"award-number":["P30 AG024827"]}]},{"name":"NIA Claude D. Pepper Older American Independence Centers at University of Pittsburgh","award":["P30 AG021332"],"award-info":[{"award-number":["P30 AG021332"]}]},{"name":"NIA Claude D. Pepper Older American Independence Centers at University of Pittsburgh","award":["UL1 TR001420"],"award-info":[{"award-number":["UL1 TR001420"]}]},{"name":"Wake Forest University","award":["R01 AG059416"],"award-info":[{"award-number":["R01 AG059416"]}]},{"name":"Wake Forest University","award":["P30 AG024827"],"award-info":[{"award-number":["P30 AG024827"]}]},{"name":"Wake Forest University","award":["P30 AG021332"],"award-info":[{"award-number":["P30 AG021332"]}]},{"name":"Wake Forest University","award":["UL1 TR001420"],"award-info":[{"award-number":["UL1 TR001420"]}]},{"name":"National Center for Advancing Translational Science at Wake Forest University","award":["R01 AG059416"],"award-info":[{"award-number":["R01 AG059416"]}]},{"name":"National Center for Advancing Translational Science at Wake Forest University","award":["P30 AG024827"],"award-info":[{"award-number":["P30 AG024827"]}]},{"name":"National Center for Advancing Translational Science at Wake Forest University","award":["P30 AG021332"],"award-info":[{"award-number":["P30 AG021332"]}]},{"name":"National Center for Advancing Translational Science at Wake Forest University","award":["UL1 TR001420"],"award-info":[{"award-number":["UL1 TR001420"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Fatigability, a phenotype of poor energy regulation, is associated with lower physical activity in older adults, but independent associations with sedentary behavior are unknown. We examined whether sedentary behavior was associated with fatigability using cross-sectional data from the Study of Muscle, Mobility and Aging. Mean sedentary time, sedentary bout length, and sedentary breaks\/day were measured using 7-day waking hour data collected from a thigh-worn accelerometer. Fatigability was assessed using the Pittsburgh Fatigability Scale Physical subscale (PFS, score 0\u201350, higher = greater fatigability) and the Pittsburgh Performance Fatigability Index (PPFI), a percentage decline of observed cadence to maximal cadence from a wrist-worn accelerometer captured during a usual-paced 400 m walk (range 0\u2013100%, higher = more performance deterioration). The participants (N = 663; 76.4 \u00b1 5.1 years, 58% women, 54% high PFS, median PPFI 1.4%) were sedentary for 614.8 \u00b1 111.7 min\/day, with a mean 15.0 \u00b1 5.5 min\/day bout length and mean 46.1 \u00b1 13.2 sedentary breaks\/day. Higher total sedentary time was associated with greater PFS Physical score (\u03b2 = 0.71, p = 0.0368), but this association was not independent of step count\/day. After adjusting for step count\/day, higher sedentary time was associated with lower PPFI score (\u03b2 = \u22120.44, p = 0.0039). Sedentary bout length and breaks\/day were not associated with perceived or performance fatigability. Future studies should aim to better understand the inter-relatedness of these behaviors.<\/jats:p>","DOI":"10.3390\/s25092722","type":"journal-article","created":{"date-parts":[[2025,4,25]],"date-time":"2025-04-25T10:42:09Z","timestamp":1745577729000},"page":"2722","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Using Wearable Devices to Examine the Associations of Sedentary Behavior with Perceived and Performance Fatigability Among Older Adults: The Study of Muscle, Mobility and Aging (SOMMA)"],"prefix":"10.3390","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4158-3180","authenticated-orcid":false,"given":"Reagan E.","family":"Garcia","sequence":"first","affiliation":[{"name":"Department of Epidemiology, School of Public Health, University of Pittsburgh, Pittsburgh, PA 15261, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0106-1150","authenticated-orcid":false,"given":"Anne B.","family":"Newman","sequence":"additional","affiliation":[{"name":"Department of Epidemiology, School of Public Health, University of Pittsburgh, Pittsburgh, PA 15261, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eileen","family":"Johnson","sequence":"additional","affiliation":[{"name":"San Francisco Coordinating Center, California Pacific Medical Center Research Institute, San Francisco, CA 94107, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7356-3320","authenticated-orcid":false,"given":"Yujia Susanna","family":"Qiao","sequence":"additional","affiliation":[{"name":"Department of Epidemiology, School of Public Health, University of Pittsburgh, Pittsburgh, PA 15261, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4938-9478","authenticated-orcid":false,"given":"Peggy M.","family":"Cawthon","sequence":"additional","affiliation":[{"name":"San Francisco Coordinating Center, California Pacific Medical Center Research Institute, San Francisco, CA 94107, USA"},{"name":"Department of Epidemiology and Biostatistics, University of California, San Francisco, CA 94158, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Barbara J.","family":"Nicklas","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine, Section on Gerontology and Geriatric Medicine, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bret H.","family":"Goodpaster","sequence":"additional","affiliation":[{"name":"Translational Research Institute for Metabolism and Diabetes, Advent Health, Orlando, FL 32804, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2265-0162","authenticated-orcid":false,"given":"Nancy W.","family":"Glynn","sequence":"additional","affiliation":[{"name":"Department of Epidemiology, School of Public Health, University of Pittsburgh, Pittsburgh, PA 15261, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,4,25]]},"reference":[{"key":"ref_1","first-page":"188","article-title":"Measuring and understanding the health impact of greater fatigability in older adults: A call to action and opportunities","volume":"11","author":"Glynn","year":"2023","journal-title":"Fatigue"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"2092","DOI":"10.1111\/jgs.15531","article-title":"Pittsburgh Fatigability Scale: One-Page Predictor of Mobility Decline in Mobility-Intact Older Adults","volume":"66","author":"Simonsick","year":"2018","journal-title":"J. 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