{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T17:05:50Z","timestamp":1789491950600,"version":"build-2803163510"},"reference-count":41,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2024,5,1]],"date-time":"2024-05-01T00:00:00Z","timestamp":1714521600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2024,5,1]],"date-time":"2024-05-01T00:00:00Z","timestamp":1714521600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. exp. orthop."],"published-print":{"date-parts":[[2024,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>Physical load during military training might increase the need for vitamin D; therefore, supplementation could be beneficial for 25(OH)D serum levels and physical performance.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>One hundred and twelve\u00a0male conscripts were randomized into two vitamin D oil capsule supplementation groups: 55 participants in the 600 IU group and 57 in the 4000 IU group with a follow\u2010up period from July 2021 to May 2022. Physical fitness tests were performed in July, October and May. Hand grip strength tests were performed in July, October and January. Blood serum (25(OH)D), parathyroid hormone PTH), calcium\u00a0and ionized calcium (i\u2010Ca) values were measured in July, October, January and May.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The 600 IU group had a lower (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001) value of 25(OH)D at all time points compared to the 4000 IU group, except at baseline. None of the subjects in the 600 IU group reached sufficient levels of 75\u2009nmol\/L of 25(OH)D in January and May. In May, 60% of participants in the 600 IU group and 30% in the 4000 IU group had 25(OH)D levels under 50\u2009nmol\/L. No significant differences in PTH or i\u2010Ca values were found between the study groups at any time point. No significant differences at any time point were found in the physical fitness test or hand grip strength test between the groups.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>A 10\u2010month vitamin D supplementation with 4000 IU decreased the incidence of vitamin D deficiency (&lt;75\u2009nmol\/L) in young, male army conscripts during wintertime, but no differences in physical performance were found compared to 600 IU supplementation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Level of Evidence<\/jats:title>\n                    <jats:p>Level I, Prospective randomized study.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/jeo2.12023","type":"journal-article","created":{"date-parts":[[2024,5,1]],"date-time":"2024-05-01T09:15:39Z","timestamp":1714554939000},"source":"Crossref","is-referenced-by-count":2,"title":["High dose vitamin D supplementation decreases the risk of deficiency in male conscripts, but has no effect on physical performance\u2014A randomized study"],"prefix":"10.1002","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2486-3922","authenticated-orcid":false,"given":"Leho","family":"Rips","sequence":"first","affiliation":[{"name":"Sports Medicine and Rehabilitation Clinic Tartu University Hospital Tartu Estonia"},{"name":"Department of Sports Medicine and Rehabilitation, Institute of Clinical Medicine, Faculty of Medicine University of Tartu Tartu Estonia"},{"name":"Centre of Military Disaster Medicine Estonian National Defence College Tartu Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alar","family":"Toom","sequence":"additional","affiliation":[{"name":"Department of Orthopedics Central Finland Central Hospital Keskussairaalantie 19 Jyv\u00e4skyl\u00e4 40620 Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rein","family":"Kuik","sequence":"additional","affiliation":[{"name":"Sports Medicine and Rehabilitation Clinic Tartu University Hospital Tartu Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ahti","family":"Varblane","sequence":"additional","affiliation":[{"name":"Centre of Military Disaster Medicine Estonian National Defence College Tartu Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hanno","family":"M\u00f6lder","sequence":"additional","affiliation":[{"name":"Medical Centre of the 2nd Infantry Brigade CSS Battalion Estonian Defence Forces V\u00f5ru Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ragnar","family":"Kibur","sequence":"additional","affiliation":[{"name":"Medical Centre of the 2nd Infantry Brigade CSS Battalion Estonian Defence Forces V\u00f5ru Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marika","family":"Laidvere","sequence":"additional","affiliation":[{"name":"Medical Centre of the 2nd Infantry Brigade CSS Battalion Estonian Defence Forces V\u00f5ru Estonia"},{"name":"Department of Nursing and Midwifery Tartu Health Care College Tartu Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mart","family":"Kull","sequence":"additional","affiliation":[{"name":"Viljandi Hospital Viljandi County Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J\u00fcri\u2010Toomas","family":"Kartus","sequence":"additional","affiliation":[{"name":"Sports Medicine and Rehabilitation Clinic Tartu University Hospital Tartu Estonia"},{"name":"Department of Sports Medicine and Rehabilitation, Institute of Clinical Medicine, Faculty of Medicine University of Tartu Tartu Estonia"},{"name":"Institute of Clinical Sciences, Sahlgrenska Academy University of Gothenburg G\u00f6teborg Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Helena","family":"Gapeyeva","sequence":"additional","affiliation":[{"name":"Clinic of Medical Rehabilitation East\u2010Tallinn Central Hospital Tallinn Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Madis","family":"Rahu","sequence":"additional","affiliation":[{"name":"Sports Medicine and Rehabilitation Clinic Tartu University Hospital Tartu Estonia"},{"name":"Department of Sports Medicine and Rehabilitation, Institute of Clinical Medicine, Faculty of Medicine University of Tartu Tartu Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,5,1]]},"reference":[{"key":"e_1_2_12_2_1","unstructured":"A healthy lifestyle\u2014WHO recommendations. 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