Authors

Almeida Kleber dos Santos

Abstract

The purpose of this study was to analyze the effects of meals with high (HGI) and low glycaemic index (LGI), and fasting (FAST) on performance, blood glucose (GLU), blood lactate concentration ([LAC]) and expired gases before, during, and after a test of running 3.000m. Eleven males underwent three experimental sessions (HGI, LGI and FAST). [LAC] and GLU were collected in the postprandial (PP) and post-exercise period. Expired gases were collected during all procedures. There were no differences (p>0.05) in performance (VO2peak and mean velocity) during 3.000m running. GLU in the HGI session was lower immediately after the running test when compared to LGI and FAST (p<0.05). At the 15th and 30th min of PP, HGI GLUC values were higher when compared to the LGI and FAST sessions (p<0.001 HGI vs. FAST; p<0.05 HGI vs. LGI), while at the 5th and 15th min of post-exercise, HGI values were lower when compared to LGI and FAST (p<0.001 HGI vs. FAST; p<0.05 HGI vs. LGI). [LAC] was higher (p<0.001) in HGI and LGI when compared to FAST at the 15th and 30th min of the PP. Finally, LGI presented higher values (p<0.05) than HGI at the 5th min of post-exercise. We conclude that meals with different glycaemic indexes did not influence the performance in a 3.000m running test. However, there were increases in GLUC and [LAC] during the PP.

Keywords

Meal, blood glucose, performance, nutrition, runners

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