Determinação dos metabolismos lático e alático da capacidade anaeróbia por meio do consumo de oxigênio Determination of lactic and alactic metabolisms of the anaerobic capacity using oxygen uptake

It has been suggested that the participation of alactic anaerobic metabolism (AAM) in physical activity can be estimated by calculating the fast component of excess post-exercise oxygen consumption (EPOC FAST ). Considering that maximal accumulated oxygen deficit (MAOD) represents the total amount of energy transferred by anaerobic metabolisms, this study aimed to analyze whether subtracting EPOC FAST from MAOD (MAOD LA-1 ) provides a satisfactory estimate of lactic anaerobic metabolism (LAM). For this purpose, MAOD LA-1 was compared with the method by which the energy derived from blood lactate accumula- tion (MAOD LA-2 ) is expressed as oxygen equivalent. Nine active adult men were submitted to four experimental sessions: 1) a maximal incremental exercise test until exhaustion on a cycle ergometer to measure the maximal oxygen consumption (VO 2 max) and the external power corresponding to VO 2 max (WVO 2 max); 2) and 3) six constant-workload tests (3 per session) at intensities below WVO 2 max; 4) one constant-workload test at an intensity corresponding to 110% of WVO 2 max. The main finding was that both methods (MAOD LA-1 e MAOD LA-2 ) that were used to estimate the contribution of LAM in MAOD resulted in similar statistical values (p > 0.05). In addition, percentage values of MAOD LA-1 (representing MAL) and EPOC FAST (representing AAM) were approximately 78 and 22%, respectively. Thus, the procedure proposed in this paper may be of interest to future studies on the