AUTHOR=Miyagi Willian E. , Bertuzzi Romulo C. , Nakamura Fabio Y. , de Poli Rodrigo A. B. , Zagatto Alessandro M. 

TITLE=Effects of Caffeine Ingestion on Anaerobic Capacity in a Single Supramaximal Cycling Test

JOURNAL=Frontiers in Nutrition

VOLUME=5

YEAR=2018

URL=https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2018.00086

DOI=10.3389/fnut.2018.00086

ISSN=2296-861X

ABSTRACT=<p>The aim of this study was to verify the effects of caffeine on anaerobic capacity estimated by the sum of the estimated glycolytic [E<sub>[La]</sub>] and phosphagen [E<sub>PCr</sub>] metabolism based on blood lactate and excess post-oxygen consumption responses (AC<sub>[La−]+EPOCfast</sub>). Fourteen male cyclists were submitted to a graded exercise test to determine the maximal oxygen uptake (<inline-formula><mml:math id="M1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mover accent="true"><mml:mrow><mml:mi>V</mml:mi></mml:mrow><mml:mo>°</mml:mo></mml:mover><mml:msub><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi>m</mml:mi><mml:mi>a</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math></inline-formula>) and intensity associated with<inline-formula><mml:math id="M2" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mover accent="true"><mml:mrow><mml:mtext> </mml:mtext><mml:mi>V</mml:mi></mml:mrow><mml:mo>°</mml:mo></mml:mover><mml:msub><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi>m</mml:mi><mml:mi>a</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math></inline-formula> (i<inline-formula><mml:math id="M3" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mover accent="true"><mml:mrow><mml:mi>V</mml:mi></mml:mrow><mml:mo>°</mml:mo></mml:mover><mml:msub><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi>m</mml:mi><mml:mi>a</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math></inline-formula>). Subsequently, the participants performed two supramaximal efforts at 115% of i<inline-formula><mml:math id="M4" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mover accent="true"><mml:mrow><mml:mi>V</mml:mi></mml:mrow><mml:mo>°</mml:mo></mml:mover><mml:msub><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi>m</mml:mi><mml:mi>a</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math></inline-formula> to determine the AC<sub>[La−]+EPOCfast</sub>, after previous supplementation with caffeine (6 mg·kg<sup>−1</sup>) 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<sub>[La−]+EPOCfast</sub> values from the placebo (4.06 ± 0.83 L and 55.2 ± 5.7 mL·kg<sup>−1</sup>) and caffeine condition (4.00 ± 0.76 L and 54.6 ± 5.4 mL·kg<sup>−1</sup>); however, a significant correlation was observed only for AC<sub>[La−]+EPOCfast</sub> expressed in absolute values (r = 0.74; p &lt; 0.002). The E<sub>[La]</sub> and E<sub>PCr</sub> also presented no significant differences and they were significantly correlated (r = 0.82 and r = 0.55, respectively; p &lt; 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.</p>