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Energy Availability clinical trials

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NCT ID: NCT05203133 Completed - Energy Balance Clinical Trials

Effects of Acute Energy Deficit and Aerobic Exercise on Muscle Quality

Start date: August 23, 2021
Phase: N/A
Study type: Interventional

10 healthy, male, participants will complete a a 5-day baseline assessment (days -5 to -1) and two consecutive 5-day periods of controlled exercise to increase oxidative capacity (3 days of aerobic exercise per period, 15 kcal/kg FFM/day energy expenditure cycling) and energy intake (15 days in total, with a testing session on morning 16). This will achieve states of energy balance (EBÍž energy availability - EA - 45 kcal/kg of fat free mass (FFM)/day), required for weight maintenance (days 1 - 5), followed by energy deficit (EDÍž EA 10 kcal/kg FFM/day), required for weight loss on days 6 - 10. Over the data-collection period, participants will consume deuterium (D2O) tracer to facilitate dynamic proteomic profiling to assess the impact of the intervention on muscle quality (primary outcome measure). Muscle biopsies will therefore be collected on days -5, 1, 6 & 11, alongside daily saliva samples, and venous blood collection on days -5, 1, 3, 5, 6, 8, 10 & 11. These samples will be used to assess further, secondary, outcome measures including alterations in intra-muscular lipid profiles (lipid droplet content, morphology and lipid-droplet associated proteins in different subcellular compartments [intermyofibrillar vs subsarcolemmal]), alterations in blood metabolites and hormones and skeletal muscle glycogen concentrations. Changes in body mass, body composition and RMR will also be assessed.

NCT ID: NCT01059968 Completed - Bone Density Clinical Trials

Low Energy Availability, Menstrual Irregularity, and Low Bone Mass

Start date: September 2008
Phase: N/A
Study type: Observational

This study examines the role of energy availability on menstrual function and bone mass in female adolescent endurance athletes. Specific evaluations include dietary intake, exercise energy expenditure, training schedules, menstrual function and bone density.