Effect of 40 Weeks of Endurance Training on the Anaerobic Threshold** This study was supported by l'Association pour le fonctionnement de l'lnstitut de Médecine du Sport de Saint-Etienne and le Bureau Médical Ministère de la Jeunesse et des Sports.
14 March 2008 (online)
The effect of a 40-week training program on the anaerobic threshold (AT) was studied in five subjects (35 ± 5 yrs). The training program consisted of a bicycle ergometer exercise 1 h per day 3 days a week at a work load corresponding to 80%-85% of V̇O2max. Before training (S0) and at the 10th, 20th, 30th, 40th weeks (S10, S20, S30, S40) of the training program, ventilatory AT (AT vent), lactate AT (AT lact), and 4 mmol AT were estimated using a graded exercise test. In the same period, another test (1) to determine V̇O2 max, maximal work load (MWL), and net efficiency (2) and a 1-h endurance exercise requiring 85%-90% of V̇O2 max were performed. After training, AT increased significantly by 10%, 11%, and 18% in AT vent, AT lact, and AT 4 mmol, respectively. MWL and net efficiency increased by 22% and 14% respectively, and there was no significant increase in V̇O2 max. The AT increase at S20 was delayed as compared to the change in MWL (S10). It is hypothesized that an AT increase provides good evidence for modifications of the muscular oxidative capacities during an endurance training program. A part of this paper is devoted to (1) the study of the reproducibility of AT estimation, (2) a comparison to other methods for determining the definition of AT, and (3) the correlations between the three methods utilized for AT estimation.
endurance training - maximal oxygen uptake - maximal work load - net efficiency - anaerobic threshold - blood lactate