Abstract
The aim of this study was to verify the effects of caffeine on anaerobic capacity estimated by the sum of the estimated glycolytic [E[La]] and phosphagen [EPCr] metabolism based on blood lactate and excess post-oxygen consumption responses (AC[La−]+EPOCfast). Fourteen male cyclists were submitted to a graded exercise test to determine the maximal oxygen uptake () and intensity associated with (i). Subsequently, the participants performed two supramaximal efforts at 115% of i to determine the AC[La−]+EPOCfast, after previous supplementation with caffeine (6 mg·kg−1) or a placebo (dextrose), in a cross over, randomized, double blind, and placebo-controlled design. The time to exhaustion was higher in the caffeine (186.6 ± 29.8 s) than in the placebo condition (173.3 ± 25.3 s) (p = 0.006) and a significant correlation was found between them (r = 0.86; P = 0.00008). Significant differences were not found between AC[La−]+EPOCfast values from the placebo (4.06 ± 0.83 L and 55.2 ± 5.7 mL·kg−1) and caffeine condition (4.00 ± 0.76 L and 54.6 ± 5.4 mL·kg−1); however, a significant correlation was observed only for AC[La−]+EPOCfast expressed in absolute values (r = 0.74; p < 0.002). The E[La] and EPCr also presented no significant differences and they were significantly correlated (r = 0.82 and r = 0.55, respectively; p < 0.05). We conclude based on the overall comparison of mean values between two treatments that acute caffeine ingestion improves the time to exhaustion but does not affect anaerobic capacity estimation.
Highlights
Acute caffeine ingestion has been shown to cause an increase in the excessive post-exercise oxygen consumption (EPOC) after resistance training [1], time to exhaustion during supramaximal effort [2] and other performance parameters
The possible changes in lactate concentrations could cause changes in the estimation of glycolytic system and alter the estimation of capacity anaerobic when estimated by blood lactate concentration and EPOC responses [6,7,8], and can alters the anaerobic capacity
We hypothesized that caffeine intake would improve performance in the supramaximal effort and change the relative energetic contribution of E[La−] and phosphagen pathway (EPCr) on AC[La−]+EPOCfast method, as observed in running [2]
Summary
Acute caffeine ingestion has been shown to cause an increase in the excessive post-exercise oxygen consumption (EPOC) after resistance training [1], time to exhaustion during supramaximal effort [2] and other performance parameters. Some studies have shown that acute ingestion of caffeine increased time to exhaustion during a supramaximal test and anaerobic capacity estimated by the maximal accumulated oxygen deficit (MAOD) [3,4,5]. Bell et al [3] found a consequent increase in peak lactate concentration after a Effects of Caffeine on Anaerobic Capacity supramaximal effort to determine MAOD with caffeine supplementation. Other studies have not shown significant effects of caffeine ingestion on exercise blood lactate concentration after supramaximal efforts to determine MAOD [4, 5]. The possible changes in lactate concentrations could cause changes in the estimation of glycolytic system and alter the estimation of capacity anaerobic when estimated by blood lactate concentration and EPOC responses [6,7,8], and can alters the anaerobic capacity
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