Caffeine Increases Work Done above Critical Power, but not Anaerobic Work.

Purpose: The assumption that the curvature constant (W[spacing acute]) of the power-duration relationship represents anaerobic work capacity is a controversial, unresolved question. We investigated if caffeine ingestion could increase total work done above critical power (CP), and if this would be accompanied by greater anaerobic energy expenditure and by an enhanced maintenance of maximal oxidative metabolic rate. Methods: Nine men (26.6 +/- 5.3 years, V[spacing dot above]O2max 40.6 +/- 5.8 mL[middle dot]kg-1[middle dot]min-1) cycled until exhaustion at different exercise intensities on different days to determine the CP and W[spacing acute]. On separated days, participants cycled until exhaustion in the severe-intensity domain (136 +/- 7% of CP) after ingesting either caffeine (5 mg[middle dot]kg-1 body mass) or a placebo. Results Time to exhaustion was 34% longer with caffeine compared to placebo, and this was accompanied by a greater work done above CP (23.7 +/- 5.7 vs 17.5 +/- 3.6 kJ; 130 +/- 30% vs 95 +/- 14% of W[spacing acute], P

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