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Within-Day Energy Deficiency and Metabolic Perturbation in Male Endurance Athletes
Univ Agder, Norway.
Univ Copenhagen, Denmark.
Univ Agder, Norway.
Univ Agder, Norway.
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2018 (English)In: International Journal of Sport Nutrition & Exercise Metabolism, ISSN 1526-484X, E-ISSN 1543-2742, Vol. 28, no 4, p. 419-427Article in journal (Refereed) Published
Abstract [en]

Endurance athletes are at increased risk of relative energy deficiency associated with metabolic perturbation and impaired health. We aimed to estimate and compare within-day energy balance in male athletes with suppressed and normal resting metabolic rate (RMR) and explore whether within-day energy deficiency is associated with endocrine markers of energy deficiency. A total of 31 male cyclists, triathletes, and long-distance runners recruited from regional competitive sports clubs were included. The protocol comprised measurements of RMR by ventilated hood and energy intake and energy expenditure to predict RMR-ratio (measured RMR/predicted RMR), energy availability, 24-hr energy balance and within-day energy balance in 1-hr intervals, assessment of body composition by dual-energy X-ray absorptiometry, and blood plasma analysis. Subjects were categorized as having suppressed (RMRratio < 0.90, n = 20) or normal (RMRratio > 0.90, n = 11) RMR. Despite there being no observed differences in 24-hr energy balance or energy availability between the groups, subjects with suppressed RMR spent more time in an energy deficit exceeding 400 kcal (20.9 [18.8-21.8] hr vs. 10.8 [2.5-16.4], p =.023) and had larger single-hour energy deficits compared with subjects with normal RMR (3,265 +/- 1,963 kcal vs. -1,340 +/- 2,439, p =.023). Larger single-hour energy deficits were associated with higher cortisol levels (r = -.499, p =.004) and a lower testosterone: cortisol ratio (r =.431, p =.015), but no associations with triiodothyronine or fasting blood glucose were observed. In conclusion, within-day energy deficiency was associated with suppressed RMR and catabolic markers in male endurance athletes.

Place, publisher, year, edition, pages
Human Kinetics, 2018. Vol. 28, no 4, p. 419-427
Keywords [en]
energy availability, resting metabolic rate, within-day energy balance
National Category
Sport and Fitness Sciences
Research subject
Social Sciences, Sport Science
Identifiers
URN: urn:nbn:se:lnu:diva-81800DOI: 10.1123/ijsnem.2017-0337ISI: 000440444600011PubMedID: 29405793OAI: oai:DiVA.org:lnu-81800DiVA, id: diva2:1303706
Available from: 2019-04-10 Created: 2019-04-10 Last updated: 2019-05-20Bibliographically approved

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Melin, Anna K.

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