The effect of low energy availability and low carbohydrate availability on hormone status, metabolism and performance in elite race walkers ('Supernova 4)

Not Applicable

• Conditions: High-performance athlete nutrition; Reproductive hormones (testosterone, LH); Bone metabolism; Metabolic hormones (T3, IGF1. leptin, cortisol); Diet and Nutrition - Other diet and nutrition disorders; Metabolic and Endocrine - Normal metabolism and endocrine development and function; Musculoskeletal - Normal musculoskeletal and cartilage development and function

• Registration Number: ACTRN12618001974291
• Lead Sponsor: Australian Catholic University

Brief Summary

Not available

Detailed Description

Not available

Study Timeline

• Results First Posted: 1900-01-01
• Study Start: 2018-12-07
• Last Update Posted: 7 January 2019

Recruitment & Eligibility

• Status: ot yet recruiting
• Sex: Male
• Target Recruitment: 24

Inclusion Criteria

Elite male race walkers who meet criteria to compete in IAAF sanctioned national and international standard races and are in training for the 2019 season.
We anticipate that most of these athletes will have participated in previous Supernova studies

Exclusion Criteria

Race walkers with diagnosed medical conditions involving thyroid function or other chronic disturbances of metabolic rate
Race walkers with symptoms of chronic LEA/RED-S (e.g. suppressed metabolic rate, low BMD)
Race walkers who are unable to complete the training or testing protocols

Study & Design

• Study Type: Interventional
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
RMR<br>measured using Douglas bag analysis [At the beginning of:<br>Phase 1 (screening)<br><br>At the end of:<br>Phase 2 (harmonisation)<br>Phase 3 (intervention)<br>Phase 4 (refeeding)<br>];25 km long walk protocol to assess bone and calcium metabolism (CTX, PINP, OC).<br>This is a hybrid laboratory/field test at ~75%VO2max.[At the end of:<br>Phase 2 (harmonisation)<br>Phase 3 (intervention)<br>Phase 4 (refeeding)];Bone metabolism<br> (CTX, PINP, OC)<br><br>Venous blood samples will be collected and analysed using ELISA kits.[During 25 km walks at time points:<br>Fasting (120min before exercise)<br>Immediately before exercise<br>Immediately after exercise<br>1h after exercise<br>3h after exercise]