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Title: Supplementation with a low-dose of octopamine does not influence endurance cycling performance in recreationally active men
Authors: Beaumont, Ross
Cordery, Philip
James, Lewis J.
Watson, Phillip
Keywords: Fatigue
Exercise
Stimulants
Supplements
Substrate oxidation
Issue Date: 2017
Publisher: © 2017 Sports Medicine Australia. Published by Elsevier Ltd
Citation: BEAUMONT, R. ...et al., 2017. Supplementation with a low-dose of octopamine does not influence endurance cycling performance in recreationally active men. Journal of Science and Medicine in Sport, 20(10), pp.952-956.
Abstract: © 2017 Sports Medicine Australia.Objectives: The aim of this study was to examine the influence of octopamine supplementation on endurance performance and exercise metabolism. Design: Double-blind cross-over study. Methods: Ten healthy, recreationally active men (Mean±SD; age: 24±2 years; body mass: 78.4±8.7kg; VO2peak: 50.5±6.8 mLkg-1 min-1) completed one VO2peak test, one familiarisation trial and two experimental trials. After an overnight fast, participants ingested either a placebo or 150mg of octopamine 60min prior to exercise. Trials consisted of 30min of cycle exercise at 55% peak power output, followed by a 30min performance task whereby participants completed as much work (kJ) as possible. Results: Performance was similar between the experimental trials (placebo: 352.8. ±. 39. kJ; octopamine: 350.9. ±. 38.3. kJ; Cohen's d effect size = 0.05; p = 0.380). Substrate oxidation and circulating concentrations of free fatty acids, prolactin and cortisol were similar between trial conditions (all p. >. 0.05). There were also no differences across trials for heart rate or perceived exertion during exercise (both p. >. 0.05). Conclusions: Acute supplementation with a low dose of octopamine did not influence endurance cycle performance, substrate oxidation or circulating hormonal concentrations, which could be due to the low serum octopamine concentrations observed. Future studies should investigate the influence of larger doses of octopamine in recreationally active and well-trained individuals during prolonged exercise in temperate and high ambient conditions.
Description: This paper is in closed access until 21st Match 2018.
Version: Accepted for publication
DOI: 10.1016/j.jsams.2017.03.007
URI: https://dspace.lboro.ac.uk/2134/25096
Publisher Link: http://dx.doi.org/10.1016/j.jsams.2017.03.007
ISSN: 1440-2440
Appears in Collections:Closed Access (Sport, Exercise and Health Sciences)

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