Efeito da suplementação de cafeína sobre biomarcadores salivares e plasmáticos em ciclistas e praticantes de spinning durante teste incremental no cicloergômetro

Abstract

This study investigated the effect of the caffeine ingestion in the salivary biomarkers, blood lactate and the physical performance, during incremental test in cycle ergometer. We tested 16 cycle men and practitioners of spinning in an adaptative test, phase A, and after the ingestion of placebo and caffeine (5mg/kg), phase B. The exercise protocol was initiated with a load of 50W, with increments of 25W to each two minutes until voluntary exhaustion. Saliva and blood samples were collected at rest and during the second minute of each work rate increment. These samples were processed and stored -20°C. The results of this study had shown that in the Inter-individual variations in the total protein concentration, in the phase A. In phase B the caffeine ingestion, one hour before the test, increased the mean total protein concentration (p<0.05) and the nitric oxide levels (p<0.01). The thresholds of blood lactate and total proteins highly had been correlated, in the two phases of the test, however in phase B, after the caffeine ingestion, the correlation falled, due to the increase salivary protein and not the blood lactate increase. The caffeine improved the performance increasing the time of exercise of the supplemented individuals. However, two subjects had presented indisposition in the post-exercise, suggesting well-taken care of individual to if consuming caffeine. Then, we conclude that the caffeine modified the concentration of nitric oxide and proteins, did not influence in the blood lactate concentration, and improved the physical performance.