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Sökning: L773:1543 2742 OR L773:1526 484X > (2015-2019)

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11.
  • Torstveit, Monica Klungland, et al. (författare)
  • Within-Day Energy Deficiency and Metabolic Perturbation in Male Endurance Athletes
  • 2018
  • Ingår i: International Journal of Sport Nutrition & Exercise Metabolism. - : Human Kinetics. - 1526-484X .- 1543-2742. ; 28:4, s. 419-427
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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