Resposta aguda cardio-respiratória a quatro modos de exercício realizado em ergómetros

Abstract

Acute cardiorespiratory responses to four ergometer exercise modes. The purpose of the present study was to examine the acute cardiorespiratory responses to four exercise modes (treadmill, cycle ergometer, elliptical and rowing ergometer) at identical heart rates. In each ergometer, 14 active healthy females performed three exercise bouts (5 minutes each) with 1 minute rest period between each bout. The first bout was performed at 60‐65% of maximal heart rate, the second at 70‐75% and the third at 80‐85%. In each bout, we measured the following variables: relative oxygen uptake, ventilation, respiratory exchange ratio and heart rate. In the rest periods, we measured systolic and diastolic blood pressure. The results were relativised to rest values and regression equations for each variable and ergometer were calculated. One-way ANOVA tested the differences across exercise modes for each exercise bout. According to the results, at the same heart rate, the magnitude of the acute responses changed across all studied exercise modes. In fact, all variables were statistically different (p<0,05) across exercise modes for the three exercise bouts. Treadmill relative oxygen uptake was the highest and respiratory exchange ratio was the lowest, probably due to the differences in active muscle mass and the absence of body mass support. Elliptical relative oxygen uptake values were the lowest and respiratory exchange ratio the highest. Rowing ergometer induced higher ventilation values and lowest systolic and diastolic blood pressure. Globally, these differences seem to be associated to active muscle mass, body mass support and motor unit recruitment. Available ergometers allow attending to individual preferences (and promoting exercise adherence), however regulating exercise prescription according to population characteristics and their specific goals is an imperative need.