Glucose ingestion does not improve maximal isokinetic force
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The purpose of this study was to assess maximal isokinetic leg extension force in response to glucose ingestion and to determine whether any performance changes occur in a time-dependent manner. Seventeen young (22.1+/-3.9 years), lean (%BF: 14.3+/-8.0; %BF Males: 9.7+/-4.2; %BF Females: 23.7+/-4.2) and recreationally active (>150min/week of physical activity) male (n=11) and female participants completed the trials. Using a double-blinded cross-over design, participants performed sets of 3 maximum isokinetic efforts on a dynamometer (HumacNorm) before and after (5-, 15-, 30-, 45-, 60-, 75- and 90-min post) ingesting either a carbohydrate (75 g glucose) or isovolumic placebo (saccharin-flavored) drink. Blood glucose and EMG were recorded concurrent with force output (max peak force; mean peak force). Despite a significant rise in blood glucose (mean glycemic excursion = 4.01+/-1.18 mmol/L), there were no significant interactions in any (absolute or percentage) force (mean peak force: p>=0.683; max peak force: p>=0.567) or EMG (mean peak EMG: p>=0.119; max peak EMG: p>=0.247) parameters measured. The ingestion of glucose resulted in a 3.4% reduction in mean force across subsequent time points (highest: +2.1% at 15min; lowest: -8.6% at 90min post ingestion), however this effect was small (d<0.1). The ingestion of glucose does not alter performance of maximal isokinetic efforts in recreationally active young individuals. Additionally, there were no differences in force when assessed as a function of time following glucose ingestion. Consequently, in the absence of fatigue, carbohydrate ingestion is unlikely to present any ergogenic benefits to athletes performing resistance-based exercise.
|Publication Type:||Journal Article|
|Murdoch Affiliation:||School of Psychology and Exercise Science|
|Copyright:||2015 by the National Strength & Conditioning Association.|
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