{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,30]],"date-time":"2026-06-30T19:07:29Z","timestamp":1782846449158,"version":"3.54.5"},"reference-count":96,"publisher":"JMIR Publications Inc.","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JMIR Mhealth Uhealth"],"abstract":"Abstract<\/jats:title>\n \n Background<\/jats:title>\n Psychological stress poses a risk to mental and physical health and has become a major public health challenge. As physical behaviors (ie, physical activity, sedentary behavior (SB), and sleep) play a key role in mental well-being, their targeted modification could be an approach to coping with stress in everyday life. Previous studies have primarily either analyzed the associations between isolated physical behaviors and stress-related outcomes or employed cross-sectional designs. Accordingly, there is a need for deeper insights into the within- and between-person associations between physical behavior over a 24-hour cycle and psychological stress in naturalistic settings.<\/jats:p>\n <\/jats:sec>\n \n Objective<\/jats:title>\n This study aimed to investigate how 24-hour physical behavior compositions are associated with daily self-perceived stress and stress-related coping self-efficacy and how replacing time in one behavior with another is linked to changes in both stress-related indicators.<\/jats:p>\n <\/jats:sec>\n \n Methods<\/jats:title>\n A total of 198 healthy university employees (mean age 35.87 y, SD 10.76; 109, 54.8% female) participated in a 15-day ambulatory assessment study. Participants reported their momentary stress and coping self-efficacy perceptions up to 6 times a day in electronic diaries. 24\u2013hour physical behavior was measured using a thigh-worn Move 4 accelerometer. The movement data were then classified on a daily basis into the 4 behavior categories of sleep, SB, light physical activity (LPA), and moderate-to-vigorous physical activity (MVPA). In order to obtain physical behavior compositions, an isometric log-ratio transformation was applied, resulting in 4 different sets. The associations between physical behavior compositions, self-perceived stress, and coping self-efficacy were analyzed using 2-level mixed multilevel models. Exploratory reallocation models were conducted to simulate the effects of time shifts from one behavior to another on both stress-related outcomes.<\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n \n The geometric average day comprised 33.9% (8.1\/24 h) sleep, 45.2% (10.8\/24 h) SB, 15.8% (3.8\/24 h) LPA, and 5.1% (1.2\/24 h) in MVPA. More time spent sleeping compared to being sedentary was associated with lower self-perceived stress (standardized\n \u03b2<\/jats:italic>\n =\u2013.03;\n t<\/jats:italic>\n 1988<\/jats:sub>\n =<\/jats:italic>\n \u20132.045;\n P=<\/jats:italic>\n .04) but not with coping self-efficacy (\n t<\/jats:italic>\n 1988<\/jats:sub>\n =\u20131.333;\n P=<\/jats:italic>\n .18) in the 24-hour cycle. The ratio of SB to the other physical behaviors and time spent in LPA or MVPA relative to SB showed no association with either stress-related outcome. Significant random effects indicate high individual variability in the analyzed associations. The exploratory substitution of SB by LPA, MVPA, or sleep showed no significant changes in self-perceived stress or coping self-efficacy within a 60-minute period.\n <\/jats:p>\n <\/jats:sec>\n \n Conclusions<\/jats:title>\n Adapting 24-hour physical behavior seems to be a promising approach to reduce stress in everyday life, for example, by extending sleep duration instead of being awake in SB. Further research should be conducted on contextual and personal influencing factors in order to develop tailored stress management interventions for the 24-hour cycle.<\/jats:p>\n <\/jats:sec>","DOI":"10.2196\/81502","type":"journal-article","created":{"date-parts":[[2026,5,22]],"date-time":"2026-05-22T20:14:06Z","timestamp":1779480846000},"page":"e81502-e81502","source":"Crossref","is-referenced-by-count":0,"title":["Associations Between 24-Hour Physical Behavior, Self-Perceived Stress, and Coping Self-Efficacy in Everyday Life: Ambulatory Assessment Study"],"prefix":"10.2196","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-6905-7300","authenticated-orcid":false,"given":"Katrin","family":"Bonn","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0258-5033","authenticated-orcid":false,"given":"Doreen","family":"Wohlfarth","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2957-242X","authenticated-orcid":false,"given":"Irina","family":"Timm","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-2062-2636","authenticated-orcid":false,"given":"Oliver","family":"Bender","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2769-5944","authenticated-orcid":false,"given":"Ulrich W","family":"Ebner-Priemer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6684-3463","authenticated-orcid":false,"given":"Marco","family":"Giurgiu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1010","published-online":{"date-parts":[[2026,5,22]]},"reference":[{"issue":"14","key":"R1","doi-asserted-by":"publisher","first-page":"1685","DOI":"10.1001\/jama.298.14.1685","article-title":"Psychological stress and disease","volume":"298","author":"Cohen","journal-title":"JAMA"},{"issue":"1","key":"R2","doi-asserted-by":"publisher","first-page":"293","DOI":"10.1146\/annurev.clinpsy.1.102803.143938","article-title":"Stress and depression","volume":"1","author":"Hammen","journal-title":"Annu Rev Clin Psychol"},{"issue":"5","key":"R3","doi-asserted-by":"publisher","first-page":"677","DOI":"10.1037\/a0026743","article-title":"Does the perception that stress affects health matter? 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