{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T05:01:00Z","timestamp":1789016460751,"version":"build-2803163510"},"reference-count":43,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2021,7,30]],"date-time":"2021-07-30T00:00:00Z","timestamp":1627603200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004423","name":"Waseda University","doi-asserted-by":"publisher","award":["Tokutei Kadai"],"award-info":[{"award-number":["Tokutei Kadai"]}],"id":[{"id":"10.13039\/501100004423","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>Metabolic suppression due to relative energy deficiency can cause various physiological impairments in athletes. The purpose of this study was to evaluate within-day energy balance (WDEB) and the ratio between measured and predicted resting energy expenditure (REEratio) and to investigate the relationships between the markers of metabolic suppression. Ten male collegiate soccer players completed a 7-day food diary, physical activity, and heart rate records during the training and rest days. Energy intake (EI) and energy expenditure (EE) were analyzed to evaluate WDEB components. Body composition was measured using dual-energy X-ray absorptiometry (DXA), and blood sampling was conducted for hormonal analysis. The REE was measured using the Douglas bag method and predicted using the DXA-predicted method to calculate the REEratio. Participants were categorized into the normal (REEratio \u2265 0.94, n = 5) and suppressed (REEratio &lt; 0.94, n = 5) groups. There were no group differences in the components of WDEB, except diet-induced thermogenesis (DIT), but EI was significantly higher in the normal group than in the suppressed group (7-day total: 3660 \u00b1 347 vs. 3024 \u00b1 491 kcal\/day, p = 0.046 and rest days: 3772 \u00b1 463 vs. 2796 \u00b1 800 kcal\/day, p = 0.046). Analysis of hormonal markers of metabolic suppression only showed a significant positive association between insulin-like growth factor-1 (IGF-1) and REEratio (r = 0.771, p = 0.009). The relationships between metabolic suppression and the markers of energy deficiency were inconclusive. There are possible associations of insufficient EI and IGF-1 levels with metabolic suppression, and further study is required to understand energy deficiency in male soccer players.<\/jats:p>","DOI":"10.3390\/nu13082644","type":"journal-article","created":{"date-parts":[[2021,8,1]],"date-time":"2021-08-01T21:44:32Z","timestamp":1627854272000},"page":"2644","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Within-Day Energy Balance and Metabolic Suppression in Male Collegiate Soccer Players"],"prefix":"10.3390","volume":"13","author":[{"given":"Sihyung","family":"Lee","sequence":"first","affiliation":[{"name":"Graduate School of Sport Sciences, Waseda University, Saitama 359-1192, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kuniko","family":"Moto","sequence":"additional","affiliation":[{"name":"Graduate School of Sport Sciences, Waseda University, Saitama 359-1192, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seungah","family":"Han","sequence":"additional","affiliation":[{"name":"Department of Sports and Leisure Studies, Yongin University, Yongin-si 17092, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Taewoong","family":"Oh","sequence":"additional","affiliation":[{"name":"Department of Sports and Leisure Studies, Yongin University, Yongin-si 17092, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5525-0136","authenticated-orcid":false,"given":"Motoko","family":"Taguchi","sequence":"additional","affiliation":[{"name":"Faculty of Sport Sciences, Waseda University, Saitama 359-1192, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"491","DOI":"10.1136\/bjsports-2014-093502","article-title":"The IOC consensus statement: Beyond the female athlete triad\u2014Relative energy deficiency in sport (RED-S)","volume":"48","author":"Mountjoy","year":"2014","journal-title":"Br. 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