Hyperpnoea and CO2 sensitivity of the respiratory centres during exercise

European Journal of Applied Physiology and Occupational Physiology
J MercierC Prefaut

Abstract

The aim of this study was to specify whether exercise hyperpnoea was related to the CO2 sensitivity of the respiratory centres measured during steady-state exercise of mild intensity. Thus, ventilation (VE), breathing pattern [tidal volume (VT), respiratory frequency (f), inspiratory time (TI), total time of the respiratory cycle (TTOT), VT/TI, TI/TTOT] and CO2 sensitivity of the respiratory centres determined by the rebreathing method were measured at rest (SCO2re) and during steady-state exercise (SCO2ex) of mild intensity [CO2 output (VCO2) = 20 ml.kg-1.min-1] in 11 sedentary male subjects (aged 20-34 years). The results showed that SCO2re and SCO2ex were not significantly different. During exercise, there was no correlation between VE and SCO2ex and, for the same VCO2, all subjects had very close VE values normalized for body mass (bm), regardless of their SCO2ex (VEbm0.75 = 1.44 l.min-1.kg-1 SD 0.10). A highly significant positive correlation between SCO2ex and VT (normalised for bm) (r = 0.80, P less than 0.01), TI (r = 0.77, P less than 0.01) and TTOT (r = 0.77, P less than 0.01) existed, as well as a highly significant negative correlation between SCO2ex and (normalised for bm-0.25) (r = -0.73, P less than 0.01). We con...Continue Reading

References

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Citations

Jan 1, 1995·European Journal of Applied Physiology and Occupational Physiology·J H Mateika, J Duffin
Jan 1, 1993·European Journal of Applied Physiology and Occupational Physiology·A Gratas-DelamarcheC Préfaut
Jan 1, 1995·European Journal of Applied Physiology and Occupational Physiology·P Pianosi, M C Khoo
Jun 1, 1996·Medicine and Science in Sports and Exercise·A K McConnell, E S Semple

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