dc.contributor.author
Schalt, Adriane
dc.contributor.author
Johannsen, Michelle M.
dc.contributor.author
Kim, Jimin
dc.contributor.author
Chen, Richard
dc.contributor.author
Murphy, Carl J.
dc.contributor.author
Coker, Melynda S.
dc.contributor.author
Gunga, Hanns-Christian
dc.contributor.author
Coker, Robert H.
dc.contributor.author
Steinach, Mathias
dc.date.accessioned
2019-03-26T15:22:33Z
dc.date.available
2019-03-26T15:22:33Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/24199
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-1971
dc.description.abstract
Purpose: The objective of this study was to determine alterations in caloric balance, body composition, metabolites, and cytokines in athletes participating in the Yukon Arctic Ultra. Methods: Ten participants traveling on foot in the 2017 692-km event were recruited for the study. Measurements and samples were obtained at pre-event, 278 km (C1), 384 km (C2), and post-event. Body composition measurements were obtained using bioelectrical impedance analysis. Accelerometer devices were utilized to provide an estimation of caloric expenditure and dietary recalls provided assessments of caloric intake. Blood serum samples were collected, processed, and analyzed using enzyme-linked immunosorbent assays or nuclear magnetic resonance. Results were analyzed using linear mixed model, presented as means +/- SD, and considered significant at p < 0.05. Results: Participants (8 males, 2 females; age: 37 +/- 10 years; body mass index: 24.4 +/- 2.5 kg/m(2)) were recruited. Four males and one female completed the entire event in 260 +/- 19 h. Caloric intake/expenditure was 4,126 +/- 1,115 kcal/day and 6,387 +/- 781 kcal/day, respectively, indicating a caloric deficit of 2,261 +/- 1,543 kcal/day. Total mass, body mass index, and fat mass were reduced at each time point of the event. Fat-free mass (FFM) was unchanged throughout the event. Follistatin was increased at C1 (1,715 +/- 876 pg/ml) in comparison to baseline. Acetoacetate increased significantly at post-event (6.1 +/- 1.5 mg/ml). Conclusions: Despite a pronounced caloric deficit and sustained activity under extreme cold conditions, FFM was preserved with an increase in serum follistatin and acetoacetate. Future studies should be directed at the role of nutrient strategies and/or training methods on the retention of FFM under these conditions.
en
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
body composition
en
dc.subject
cold exposure
en
dc.subject
extreme environment
en
dc.subject
ultramarathon
en
dc.subject.ddc
600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit
dc.title
Negative Energy Balance Does Not Alter Fat-Free Mass During the Yukon Arctic Ultra-The Longest and the Coldest Ultramarathon
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.articlenumber
1761
dcterms.bibliographicCitation.doi
10.3389/fphys.2018.01761
dcterms.bibliographicCitation.journaltitle
Frontiers in Physiology
dcterms.bibliographicCitation.originalpublishername
Frontiers Media S.A.
dcterms.bibliographicCitation.volume
9
refubium.affiliation
Charité - Universitätsmedizin Berlin
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.bibliographicCitation.pmid
30662406
dcterms.isPartOf.issn
1664-042X