Breathing strategy in master athletes and untrained elderly subjects according to the incremental protocol

Abstract

To analyze the influence of step-duration protocol (1 vs. 3 min) on breathing strategy according to the physical fitness of healthy elderly subjects, this study compared the ventilatory responses and exercise tidal flow-volume loops (ETFVL) at the first and second ventilatory thresholds (VT1and VT2). Nineteen master athletes (mean age (± SD), 63.1 ± 3.2 y; [Formula: see text]O2 max, 41.5 mL·(min·kg)-1) and 8 untrained elderly subjects (age, 65.5 ± 2.3 y; [Formula: see text]O2 max, 25.8 mL·(min·kg)-1) performed 2 exhaustive exercise tests on a cycle ergometer. In untrained subjects, at VT1and VT2, no significant difference was measured in ventilatory responses and ETFVL between protocols. Master athletes, at VT2, presented a significantly higher [Formula: see text]CO2(P < 0.01), ventilation ([Formula: see text]E; P < 0.01), breathing frequency (fb; P < 0.05), tidal volume relative to inspiratory capatcity (Vt/IC) (P < 0.01),Vtrelative to forced vital capacity (Vt/FVC; P < 0.05), and lower inspiratory reserve volume relative to FVC (IRV/FVC; P < 0.01) during the 1 min protocol than during the 3 min protocol. Master athletes, at maximal exercise, expressed significantly higher [Formula: see text]CO2(P < 0.01) and dyspnea (P < 0.05) with the shorter protocol. We concluded that, in untrained subjects, neither incremental exercise test had an impact on respiratory responses during exercise. Nevertheless, in master athletes, breathing strategy seems to be protocol dependent. The short test induced higher mechanical ventilatory constraints and dyspneic feeling than the long protocol, which could be explained by a higher [Formula: see text]E itself linked to a greater [Formula: see text]CO2and a higher blood lactate concentration.Key words: exercise flow-volume loops, master athletes, submaximal exercise, mechanical ventilatory constraints.