n International SportMed Journal - Neuromuscular fatigue threshold, critical power and anaerobic work capacity under caffeine ingestion : original research
|Article Title||Neuromuscular fatigue threshold, critical power and anaerobic work capacity under caffeine ingestion : original research|
|© Publisher:||International Federation of Sports Medicine|
|Journal||International SportMed Journal|
|Author||Ezequiel Moreira Goncalves, Eduardo Bodnariuc Fontes, Bruno de Paula Caraca Smirmaul, Ricardo Okada Triana, Alexandre Hideki Okano, Gil Guerra-Junior, Antonio Carlos De Moraes and Leandro Ricardo Altimari|
|Publication Date||Dec 2010|
|Pages||380 - 388|
|Keyword(s)||Anaerobic capacity, Caffeine, Electromyography, Ergogenic substances, Fatigue, Federal University of Rio Grande do Norte, Brazil, State University of Campinas, Brazil and State University of Londrina, Brazil|
The present study examined the effects of acute ingestion of caffeine on the rate of increase of electromyographic signal (EMGslope), neuromuscular fatigue threshold (NFT), critical power (CP) and anaerobic work capacity (AWC). Eight males (25.7 ± 3.4 years; 82.0 ± 9.1kg; 180.2 ± 5.4cm) performed four constant-load bouts on a cycle ergometer until exhaustion under two different conditions : caffeine (6mg. kg-1) and placebo. The trials were performed at 80%, 90%, 100% and 110% (Trial80%, Trial90%, Trial100% and Trial110%,) respectively of peak power output determined by a maximal incremental test. The EMGslope was compared from the superficial quadriceps muscles, time to exhaustion, as well as NFT, CP and AWC estimated in both conditions. The caffeine ingestion showed higher time to exhaustion (12-17%) for Trial100% and Trial110% (P<0.05), but no significant changes were observed for EMGslope (P>0.05). Thus neither NFT nor CP changed, but AWC improved (~23%) significantly during the caffeine condition. It is concluded that caffeine ingestion did not affect the EMGslope, NFT and CP in physically active adult males; however, AWC increased, detecting the caffeine effects on anaerobic capacity.
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