Sprint, strength and body mass changes following ingestion of a combined supplement by competitive games players

Ellmore, Mistrelle (2018) Sprint, strength and body mass changes following ingestion of a combined supplement by competitive games players. European Journal of Sport Science, 23 . p. 764. ISSN 978-3-9818414-1-1

Full content URL: http://ecss-congress.eu/2018/

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Item Type:Article
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Abstract

Introduction
From survey findings (Airstone et al. 2005), a significant proportion of players chose this supplement to improve muscle mass and performance. The purpose of this investigation is to determine whether the reasons for supplement choice were justified as the evidence available to support supplementation of this combination of ingredients is not sufficient.
Methods
Fifteen trained male games players (mean body mass 80.4kg±7.7) ingested 1.2g.kg.day-1 of a combined supplement or placebo for a period of 8 weeks, through randomised, double-blind, crossover administration. The effects of the powdered supplement (SUPPL) containing whey protein, carbohydrate, creatine monohydrate and glutamine or lactose placebo (PLA) were determined in ten, 6s cycle ergometer sprints with 24s active recovery in terms of peak power output (PPO), mean power output (MPO), fatigue index (FI) and peak pedal frequency (PPF). Measures of maximal strength during 1 repetition (1RM) of bench press (Max B) and squat (MaxS) exercises and changes in total body mass (TBM) and lean body mass (LBM) were also recorded. Differences between treatment, trial and performance data were established using repeated measures ANOVAs (F1,15) and interactions were determined using the Bonferroni correction (P≤0.0125).
Results
After determining that activity (P=0.912) and dietary intake of protein (P = 0.260) were consistent during placebo and supplement phases of the investigation and there were no crossover effects, significant interactions (P≤0.0125) between treatments (Placebo, Supplement) and trials (Pre, Post) were determined in terms of PPO (PLA:892W SUPPL:937W F(1,15)=27.000), FI (PLA:43% SUPPL:39% F(1,15)=47.221), PPF (PLA:83rpm SUPPL:90rpm F(1,15)=36.347), TBM (PLA:82kg SUPPL:83kg F(1,15)=54.255) and MaxS (PLA:86kg SUPPL:98kg F(1,15)=88.872).
Discussion
These findings demonstrate that, to some extent, participants’ reasons for choosing this supplement were justified. The mechanisms of effect can be attributed to participants’ meeting daily requirements for calorie and protein intake, established for these athletes in a previous study (Ellmore, 2017) and a number of previously reported factors including enhanced pre-exercise phosphocreatine storage, adenosine triphosphate availability, a reduction in muscle relaxation time and muscle growth, which may alter protein turnover and enhance training capability. Further research incorporating appropriate dietary control and analysis of supplement content would highlight the impact of such supplement intake more effectively.

Keywords:Protein, supplement, sport, games player
Subjects:C Biological Sciences > C600 Sports Science
Divisions:College of Social Science > School of Sport and Exercise Science
ID Code:34489
Deposited On:13 Feb 2019 15:17

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