Caffeine improves supramaximal cycling but not the rate of anaerobic energy release

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Title Caffeine improves supramaximal cycling but not the rate of anaerobic energy release
Author Simmonds, Michael; Minahan, Clare Leslie; Sabapathy, Surendran
Journal Name European Journal of Applied Physiology
Editor Susan A Ward
Year Published 2010
Place of publication Germany
Publisher Springer
Abstract The purpose of this study was to determine if improved supramaximal exercise performance in trained cyclists following caffeine ingestion was associated with enhanced O2 uptake ( _VO2 kinetics), increased anaerobic energy provision (accumulated O2—AO2—deficit), or a reduction in the accumulation of metabolites (for example, K?) associated with muscular fatigue. Six highly trained male cyclists ( _V O2peak 68 ± 8 mL kg-1 min-1) performed supramaximal (120% _V O2peak) exercise bouts to exhaustion on an electronically braked cycle ergometer, following double-blind and randomized ingestion of caffeine/ placebo (5 mg kg-1). Time to exhaustion (TE), _V O2 kinetics, AO2 deficit, blood lactate (La-), plasma potassium (K?), caffeine and paraxanthine concentrations were measured. Caffeine ingestion elicited significant increases in TE (14.8%, p\0.01) and AO2 deficit (6.5%, p\0.05). In contrast, no changes were observed in AO2 deficit at isotime, _V O2 kinetics, blood [La-] at exhaustion or peak [K?] following caffeine ingestion. However, [K?] was significantly reduced (13.4%, p\0.01) during warm-up cycling immediately prior to the onset of the supramaximal bout for the caffeine trials, compared with placebo. It appears that caffeine ingestion is beneficial to supramaximal cycling performance in highly trained men. The reduced plasma [K?] during submaximal warm-up cycling may prolong the time taken to reach critical [K?] at exhaustion, thus delaying fatigue. Considering caffeine ingestion did not change _V O2 kinetics or isotime AO2 deficit, increases in absolute AO2 deficit may be a consequence of prolonged TE, rather than causal.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1007/s00421-009-1351-8
Volume 109
Issue Number 2
Page from 287
Page to 295
ISSN 1439-6319
Date Accessioned 2010-07-29
Date Available 2010-09-16T08:18:25Z
Language en_AU
Research Centre Griffith Health Institute; Heart Foundation Research Centre
Faculty Griffith Health Faculty
Subject Exercise Physiology
URI http://hdl.handle.net/10072/34016
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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