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Title Individual Glucose Threshold and Maximal Lactate Steady State Coincidence Analysis
Author THIAGO TEIXEIRA MENDES, CRISTIANO LINO M. DE BARROS, LUCAS DE AVILA C. F. MORTIMER, GUILHERME MORAIS PUGA, GUILHERME PASSOS RAMOS, LUCIANO SALES PRADO, EMERSON SILAMI-GARCIA
Abstract
Mendes TT, Barros CLM, Mortimer LACF, Puga GM, Ramos GP, Prado LS, Silami-Garcia E. Individual Glucose Threshold and Maximal Lactate Steady State Coincidence Analysis. JEPonline 2011;14(2):27- 35. The purpose of the present study was to analyze the association between the individual glucose threshold (IGT) and the maximal lactate steady state (MLSS). Eight physically active men performed an incremental exercise test to identify the IGT, and three to five 30 min submaximal exercise bouts to evaluate the MLSS on a cycle ergometer. Blood samples were collected from the earlobe at the end of each stage of the incremental exercise tests and every 5 min during the submaximal tests to determine blood lactate ([La-]) and blood glucose concentration. Heart rate (HR) was continuously measured during all tests. We were
not able to identify the IGT in two subjects. Power output and VO2 identified by the IGT were not different to those identified by MLSS (165 ± 9 and 180 ± 11 W; 31.88 ± 1.89 and 34.81 ± 1.83 mL· kg-1· min-1, respectively). HR and [La-] were lower in the IGT compared to MLSS (154 ± 7 and 168 ± 3 bpm; 3.93 ± 0.87 and 5.60 ± 0.26 mM, respectively; p<0.05). The agreement correlation coefficients between IGT and MLSS for power output (-0.13), HR (0.13) and VO2 (-0.42) were not statistically significant (p>0.05). The results indicate that the IGT method does not represent a valid estimate of the MLSS.
Citation
Keywords Anaerobic Threshold, Blood Lactate, Exercise, Cycling
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