The aim of this study was to evaluate the effect of co-ingesting carbohydrate and caffeine (CHO+CAF) in comparison to carbohydrate (CHO) and placebo (PLA), during a reliable soccer-specific test (Currell et al, 2009). 8 university-standard soccer players ingested a PLA, a 6.4% CHO or 6.4% CHO and 160 mg CAF (CHO+CAF) solution on three occasions, in a double-blind randomised cross-over design, with each trial separated by 7 days. The protocol was 90 min in duration, made up of ten 6 min exercise blocks, each followed by soccer-specific skills tests (agility, dribbling, heading and kicking accuracy). Dependant variables (Agility, dribbling, heading, kicking accuracy, glucose, lactate, HR and RPE) were analysed using one-way repeated measures ANOVA. Significant difference (p< 0.05) was found between CHO+CAF, CHO and PLA for each of the soccer-specific skill tests. Significant improvement (p= 0.02) was observed in agility time in CHO versus PLA trials, although no significant difference (p> 0.05) was reported for dribbling, heading and kicking accuracy. Blood glucose and lactate were elevated (p< 0.05) with CHO+CAF supplementation over PLA, but there was no difference (p> 0.05) compared to CHO. Blood glucose increased (p= 0.01) in the CHO trial compared to PLA, with no difference (p> 0.05) between CHO+CAF and CHO. No significant difference (p> 0.05) was reported for HR and RPE values across all trial conditions. Skill performance during simulated soccer activity improved with CHO+CAF supplementation in comparison to both CHO and PLA. CHO+CAF co-ingestion had no ergogenic benefit over CHO in the maintenance and availability of blood glucose however, CHO+CAF co-ingestion did allow players to sustain a higher work intensity as opposed to CHO and PLA beverages as shown by elevated blood lactate levels.
Statistics from Altmetric.com
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.