{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,12]],"date-time":"2026-06-12T14:03:45Z","timestamp":1781273025972,"version":"3.54.1"},"reference-count":23,"publisher":"SAGE Publications","license":[{"start":{"date-parts":[[2026,6,9]],"date-time":"2026-06-09T00:00:00Z","timestamp":1780963200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"funder":[{"DOI":"10.13039\/501100004837","name":"ministerio de ciencia e innovaci\u00f3n","doi-asserted-by":"publisher","award":["PID2022-142316OB-I00"],"award-info":[{"award-number":["PID2022-142316OB-I00"]}],"id":[{"id":"10.13039\/501100004837","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Proc Inst Mech Eng H"],"abstract":"<jats:p>\n                    To examine the associations of objectively measured sedentary behavior and ambulatory activity with circulating 25-hydroxyvitamin D (25(OH)D) concentrations, this cross-sectional study analyzed baseline data from physically inactive postmenopausal women within 10\u2009years of menopause onset and with vitamin D deficiency (25(OH)D\u2009&lt;30\u2009ng\/ml). A total of 120 postmenopausal women were assessed, and analyses were restricted to those with vitamin D deficiency (\n                    <jats:italic toggle=\"yes\">n<\/jats:italic>\n                    \u2009=\u200988). Physical activity and sedentary behavior were evaluated under free-living conditions using a wrist-worn triaxial accelerometer (Fitbit Versa 3) worn continuously for 7 consecutive days. Participants were stratified into tertiles of daily step count and sedentary time within the vitamin D\u2013deficient subgroup. Differences in serum 25(OH)D concentrations across tertiles were examined using Kruskal\u2013Wallis tests with Bonferroni-corrected Mann\u2013Whitney post hoc comparisons when appropriate, and associations between continuous variables were assessed using Spearman correlation.\u2009No significant differences in serum 25(OH)D concentrations were observed across tertiles of daily step count (Kruskal\u2013Wallis,\n                    <jats:italic toggle=\"yes\">p<\/jats:italic>\n                    \u2009=\u20090.23), and daily step count was not correlated with 25(OH)D concentrations (Spearman\u2019s \u03c1\u2009\u2248\u20090,\n                    <jats:italic toggle=\"yes\">p<\/jats:italic>\n                    \u2009=\u20090.52). In contrast, serum 25(OH)D concentrations differed significantly across sedentary-time tertiles (Kruskal\u2013Wallis,\n                    <jats:italic toggle=\"yes\">p<\/jats:italic>\n                    \u2009&lt;\u20090.05), with lower levels observed in women in the highest compared with the lowest sedentary tertile (Bonferroni-corrected\n                    <jats:italic toggle=\"yes\">p<\/jats:italic>\n                    \u2009&lt;\u20090.05). Consistently, sedentary time showed a modest but statistically significant inverse association with circulating 25(OH)D concentrations (Spearman\u2019s \u03c1\u2009=\u2009\u22120.28,\n                    <jats:italic toggle=\"yes\">p<\/jats:italic>\n                    \u2009=\u20090.010).\u2009In vitamin D\u2013deficient postmenopausal women in early post menopause, objectively measured sedentary behavior, but not ambulatory activity volume, was associated with lower serum vitamin D concentrations. These findings suggest that sedentary behavior may be associated with lower vitamin D concentrations in this specific subgroup, highlighting the potential relevance of sedentary patterns as a behavioral correlate warranting further investigation.\n                  <\/jats:p>","DOI":"10.1177\/09544119261451975","type":"journal-article","created":{"date-parts":[[2026,6,10]],"date-time":"2026-06-10T05:08:28Z","timestamp":1781068108000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Sedentary behavior, but not daily step count, is associated with vitamin D status in postmenopausal women: An accelerometer-based study"],"prefix":"10.1177","author":[{"given":"Raquel","family":"Domingo-Molina","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology, Biomedicine Institute of Seville (IBIS), Hospital Universitario Virgen del Roc\u00edo, CSIC, Seville, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda \u00c1ngeles","family":"Mart\u00ednez-Maestre","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, Biomedicine Institute of Seville (IBIS), Hospital Universitario Virgen del Roc\u00edo, CSIC, Seville, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergio","family":"Tejero","sequence":"additional","affiliation":[{"name":"Orthopaedic Department, Head of Foot and Ankle Unit, Department of Surgery, University Hospital Virgen del Roc\u00edo, University of Seville, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9396-6354","authenticated-orcid":false,"given":"Gonzalo","family":"Reverte-Pagola","sequence":"additional","affiliation":[{"name":"Department of Physical Education and Sport, University of Seville, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7425-8694","authenticated-orcid":false,"given":"Adri\u00e1n","family":"Feria Madue\u00f1o","sequence":"additional","affiliation":[{"name":"Department of Physical Education and Sport, University of Seville, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9969-9573","authenticated-orcid":false,"given":"Borja","family":"Sa\u00f1udo Corrales","sequence":"additional","affiliation":[{"name":"Department of Physical Education and Sport, University of Seville, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,6,9]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"crossref","unstructured":"Anagnostis P Livadas S Goulis DG et al. 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