1. Case Study: Energy Availability and Endocrine Markers in Elite Male Track Cyclists
- Author
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Stacy T. Sims, Katherine L. Schofield, and Holly Thorpe
- Subjects
Adult ,Male ,Physical Therapy, Sports Therapy and Rehabilitation ,Young Adult ,Sex hormone-binding globulin ,Animal science ,Humans ,Endocrine system ,Medicine ,Orthopedics and Sports Medicine ,Energy deficiency ,Testosterone ,biology ,business.industry ,Cross-Sectional Studies ,Athletes ,Cohort ,Basal metabolic rate ,Body Composition ,biology.protein ,Basal Metabolism ,Dietary Proteins ,Energy Intake ,Energy Metabolism ,business ,Cycling ,Luteinizing hormone - Abstract
Aim: To highlight energy availability status, resting metabolic rate measures, dietary protein intake, and testosterone concentration in 4 elite male track cycling athletes (mean [SD]: age: 20.8 [1.5] y, body mass: 76.3 [3.6] kg, height: 181.8 [2.9] cm). Method: A cross-sectional observation included measures of energy availability (energy intake minus exercise energy expenditure, divided by fat-free mass), resting metabolic rate from indirect calorimetry, dietary protein intake from food records, blood analysis to assess sex hormone status, and performance markers. Results: Midrange testosterone (16.9–19.8 nmol/L), lowered resting metabolic rate ratio (0.76–0.98), varied luteinizing hormone (4–10 U/L), and suboptimal energy availability (26–41 kcal/kg fat-free mass/d, range) were observed in the male track cyclists. Protein intakes ranged from 2.0 g to 2.8 g protein/kg/d. Conclusion: The current cohort may have within-day energy deficiency, putting them in a catabolic state.
- Published
- 2022