{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,10]],"date-time":"2026-10-10T02:49:49Z","timestamp":1791600589008,"version":"4.3.4"},"reference-count":22,"publisher":"Human Kinetics","issue":"6","license":[{"start":{"date-parts":[[2025,6,1]],"date-time":"2025-06-01T00:00:00Z","timestamp":1748736000000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,6,1]]},"abstract":"<jats:p>High total energy expenditure (TEE) and rate of water turnover (rH<jats:sub>2<\/jats:sub>O) using doubly labeled water (<jats:sup>2<\/jats:sup>H<jats:sub>2<\/jats:sub><jats:sup>18<\/jats:sup>O) have been reported during single-stage and multistage ultraendurance events. At the 161-km distance, less is known about the interaction of TEE, rH<jats:sub>2<\/jats:sub>O, and ad libitum energy\/fluid intake. This is especially true during the postrace recovery window. <jats:italic><jats:bold>Purpose<\/jats:bold>:<\/jats:italic> To measure TEE, rH<jats:sub>2<\/jats:sub>O, and ad libitum energy\/fluid intake during a 161-km ultramarathon while extending the TEE and rH<jats:sub>2<\/jats:sub>O measurement window to a 7-day postrace period. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Doubly labeled water was used to monitor TEE and rH<jats:sub>2<\/jats:sub>O in 2 male ultrarunners (R1, R2) during a 161-km ultramarathon. Self-reported energy\/fluid intake was recorded at crew-accessible aid stations. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> Both runners completed the race in 32.8\u00a0hours, and TEE over this period was 65.8\u00a0MJ (6.5 \u00d7 basal metabolic rate [BMR], 15,723\u00a0kcal, 11,225\u00a0kcal\u00b724\u00a0h<jats:sup>\u22121<\/jats:sup>) in R1 and 66.5\u00a0MJ (7.4 \u00d7BMR, 15,888\u00a0kcal, 11,293\u00a0kcal\u00b724\u00a0h<jats:sup>\u22121<\/jats:sup>) in R2. Race energy intake for both runners approximated 50% of TEE, with reported fluid consumption of 21.8\u00a0L and 15.7\u00a0L for R1 and R2, respectively. rH<jats:sub>2<\/jats:sub>O during the race was 14.6\u00a0L in R1 and 15.5\u00a0L in R2. During the 7-day postrace period, total TEE and rH<jats:sub>2<\/jats:sub>O were 94.7\u00a0MJ (1.9 \u00d7BMR, 22,634\u00a0kcal, 3245\u00a0kcal\u00b7d<jats:sup>\u22121<\/jats:sup>) and 41.8\u00a0L for R1 and 80.0\u00a0MJ (1.8 \u00d7BMR, 19,116\u00a0kcal, 2721\u00a0kcal\u00b7d<jats:sup>\u22121<\/jats:sup>) and 24.0\u00a0L for R2, respectively. <jats:italic><jats:bold>Conclusion<\/jats:bold>:<\/jats:italic> These data illustrate the expected nutrient and fluid budgets for ultramarathons and describe the challenge of restoring acute negative energy balance following these events.<\/jats:p>","DOI":"10.1123\/ijspp.2024-0535","type":"journal-article","created":{"date-parts":[[2025,4,16]],"date-time":"2025-04-16T17:51:13Z","timestamp":1744825873000},"page":"869-874","source":"Crossref","is-referenced-by-count":6,"title":["Total Energy Expenditure and Intake During a 161-km Mountain Ultramarathon"],"prefix":"10.1123","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9988-2247","authenticated-orcid":true,"given":"Andrew R.","family":"Creer","sequence":"first","affiliation":[{"name":"Department of Exercise Science and Outdoor Recreation, Utah Valley University, Orem, UT, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-9453-1455","authenticated-orcid":true,"given":"Melani R.","family":"Kelly","sequence":"additional","affiliation":[{"name":"Department of Exercise Science and Outdoor Recreation, Utah Valley University, Orem, UT, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2498-0966","authenticated-orcid":true,"given":"Alejandro M.","family":"Rosales","sequence":"additional","affiliation":[{"name":"School of Integrative Physiology and Athletic Training, Montana Center for Work Physiology and Exercise Metabolism, University of Montana, Missoula, MT, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Malone T.","family":"Levanger","sequence":"additional","affiliation":[{"name":"Department of Exercise Science and Outdoor Recreation, Utah Valley University, Orem, UT, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dallin R.","family":"Hart","sequence":"additional","affiliation":[{"name":"Department of Exercise Science and Outdoor Recreation, Utah Valley University, Orem, UT, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5770-3853","authenticated-orcid":true,"given":"Dale A.","family":"Schoeller","sequence":"additional","affiliation":[{"name":"Department of Nutritional Sciences, University of Wisconsin, Madison, WI, USA"},{"name":"Isotope Ratio Mass Spectrometry Core Laboratory, University of Wisconsin, Madison, WI, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tim C.","family":"Shriver","sequence":"additional","affiliation":[{"name":"Isotope Ratio Mass Spectrometry Core Laboratory, University of Wisconsin, Madison, WI, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jason V.","family":"Thomas","sequence":"additional","affiliation":[{"name":"Department of Health and Kinesiology, University of Utah, Salt Lake City, UT, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3565-8094","authenticated-orcid":true,"given":"Brent C.","family":"Ruby","sequence":"additional","affiliation":[{"name":"School of Integrative Physiology and Athletic Training, Montana Center for Work Physiology and Exercise Metabolism, University of Montana, Missoula, MT, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"100","reference":[{"issue":"1","key":"r1","series-title":"Comp Exerc Physiol","doi-asserted-by":"publisher","DOI":"10.3920\/CEP140025","article-title":"Extreme endurance and the metabolic range of sustained activity is uniquely available for every human not just the elite few","volume":"11","author":"Ruby BC","year":"2015","unstructured":"Ruby BC, Cuddy JS, Hailes WS, et\u00a0al. 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