n International SportMed Journal - Neuromuscular fatigue threshold, critical power and anaerobic work capacity under caffeine ingestion : original research




The present study examined the effects of acute ingestion of caffeine on the rate of increase of electromyographic signal , 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% (Trial, Trial, and ,) respectively of peak power output determined by a maximal incremental test. The 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 and (<0.05), but no significant changes were observed for (>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 , NFT and CP in physically active adult males; however, AWC increased, detecting the caffeine effects on anaerobic capacity.


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