Influência do envelhecimento sobre a máxima fase estável de lactato em mulheres

Abstract

Aging promotes some physiological changes in relation to lactate production, which may influence the intensity of exercise associated with the maximal lactate steady state (iMLSS). The purpose of this study was to analyze the influence of aging on lactate responses and physiological parameters associated with exercise intensity in MLSS in women. Twenty-three active women participated in the study, of which 11 were young (GMJ: 24.3 ± 3.3 years) and 12 postmenopausal women (GMP: 56.2 ± 6.8 years). Were performed 2 to 4 30-min tests with constant load on treadmill to identify the MLSS, as well as the subjective perception of effort (PSE), heart rate (HR) at this intensity. There was a significant reduction (p <0.05) in the blood lactate concentration, HR and treadmill intensity in the intensity of MLSS (iMLSS) in postmenopausal women compared to young women. The %HRmax were similar in both groups. It can be concluded that the lactate concentration and exercise intensity associated with the maximal lactate staedy state reduces throughout the aging process, but the relative effort of the exercise evaluated by % of HRmax remain similar among young and postmenopausal women.