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- W2210549303 abstract "Eight healthy young men underwent two separate steady-state incremental exercise runs within the aerobic range on a treadmill with alternating periods of breathing with no load (NL) and with an inspiratory resistive load (IRL) of approximately 12 cmH2O.1–1.s. End-tidal PCO2 was maintained constant throughout each run at the eucapnic or a constant hypercapnic level by adding 0–5% CO2 to the inspired O2. Hypercapnia caused a steepening, as well as upward shift, relative to the corresponding eucapnic ventilation-CO2 output (VE - VCO2) relationship in NL and IRL. Compared with NL, the VE - VCO2 slope was depressed by IRL, more so in hypercapnic [-19.0 +/- 3.4 (SE) %] than in eucapnic exercise (-6.0 +/- 2.0%), despite a similar increase in the slope of the occlusion pressure at 100 ms - VCO2 (P100 - VCO2) relationship under both conditions. The steady-state hypercapnic ventilatory response at rest was markedly depressed by IRL (-22.6 +/- 7.5%), with little increase in P100 response. For a given inspiratory load, breathing pattern responses to separate or combined hypercapnia and exercise were similar. During IRL, VE was achieved by a greater tidal volume (VT) and inspiratory duty cycle (TI/TT) along with a lower mean inspiratory flow (VT/TI). The increase in TI/TT was solely because of a prolongation of inspiratory time (TI) with little change in expiratory duration for any given VT. The ventilatory and breathing pattern responses to IRL during CO2 inhalation and exercise are in favor of conservation of respiratory work.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2210549303 date "1989-05-01" @default.
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- W2210549303 title "Effects of inspiratory resistive load on respiratory control in hypercapnia and exercise" @default.
- W2210549303 doi "https://doi.org/10.1152/jappl.1989.66.5.2391" @default.
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