Effect of creatine plus caffeine supplements on time to exhaustion during an incremental maximum exercise

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Title:	Effect of creatine plus caffeine supplements on time to exhaustion during an incremental maximum exercise
Authors:	Lee, CL (Lee, Chia Lun) Lin, JC (Lin, Jung Charng) Cheng, CF (Cheng, Ching Feng)
Contributors:	Grad Inst Sport Coaching
Keywords:	Aerobic capacity ergogenic aids grade exercise test perceived exertion
Date:	2012
Issue Date:	2013-02-25 15:43:58 (UTC+8)
Abstract:	This study investigated the effects of acute caffeine ingestion following short-term creatine supplementation on an incremental cycling to exhaustion task. Twelve active males performed the task under three conditions: baseline condition (BASE, no ergogenic aid), creatine plus caffeine condition (CRE + CAF), and creatine with placebo condition (CRE + PLA). Following the establishment of BASE condition, participants were administered CRE + CAF (0.3 g.kg(-1).day(-1) of creatine for 5 days followed by 6 mg.kg(-1) of caffeine 1 h prior to testing) and CRE + PLA (0.3 g.kg(-1).day(-1) of creatine for 5 days followed by 6 mg.kg(-1) of placebo 1 h prior to testing) in a double-blind, randomized crossover and counterbalancing protocol. No significant differences were observed in relative maximal oxygen consumption ((V) over dotO(2max)) (51.7 +/- 5.5, 52.8 +/- 4.9 and 51.3 +/- 5.6 ml-kg(-1-)min(-1) for BASE, CRE + CAF and CRE + PLA, respectively; P > 0.05) and absolute (V) over dotO(2max) (3.6 +/- 0.4, 3.7 +/- 0.4 and 3.5 +/- 0.5 l.min(-1) for BASE, CRE + CAF and CRE + PLA, respectively; P > 0.05). Blood samples indicated significantly higher blood lactate and glucose concentrations in the CRE + CAF among those in the BASE or CRE + PLA condition during the test (P < 0.05). The time to exhaustion on a cycling ergometer was significantly longer for CRE + CAF (1087.2 +/- 123.9 s) compared with BASE (1009.2 +/- 86.0 s) or CRE + PLA (1040.3 +/- 96.1 s). This study indicated that a single dose of caffeine following short-term creatine supplementation did not hinder the creatine-caffeine interaction. In fact, it lengthened the time to exhaustion during an incremental maximum exercise test. However, this regime might lead to the accumulation of lactate in the blood.
Relation:	EUROPEAN JOURNAL OF SPORT SCIENCE 卷: 12 期: 4 頁數: 338-346
Appears in Collections:	[Graduate Institute of Sport Coaching Science ] journal articles

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