Individual glucose threshold and maximal lactate steady state coincidence analysis

• Published in: Journal of exercise physiology online Vol. 14; no. 2; pp. 27 - 35
• Main Authors: Mortimer, Lucas De Avila C.F, De Barros, Cristiano Lino M, Prado, Luciano Sales, Silami-Garcia, Emerson, Mendes, Thiago Teixeira, Puga, Guilherme Morais, Ramos, Guilherme Passos
• Format: Journal Article
• Language: English
• Published: American Society of Exercise Physiologists 01-04-2011
• Subjects: Anaerobic exercise; Glucose metabolism; Health aspects; Heart beat; Physiological aspects; Properties
• ISSN: 1097-9751; 1097-9751

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):2735. 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.sup.-]]) 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 V[O.sub.2] 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 x [kg.sup.-1] [min.sup.-1], respectively). HR and [[La.sup.-]] 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 V[O.sub.2] (-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. Key Words: Anaerobic Threshold, Blood Lactate, Exercise, Cycling