NDLI: A learned component of the ventilatory response to exercise in man

Content Provider	PubMed Central
Author	Wood, Helen E. Fatemian, Marzieh Robbins, Peter A.
Copyright Year	2003
Abstract	The ventilatory response to mild-to-moderate exercise in humans is isocapnic, or ‘error-free’. It has been suggested that this response is learned over many repetitions of exercise through the process of minimising any deviations from normal in the blood gas tensions, as sensed by the chemoreceptors. However, relatively limited training programmes have failed to produce any convincing evidence in humans that forcibly altering the blood gas tensions during repeated periods of exercise alters the subsequent steady-state ventilatory response to exercise. In this study, eight healthy young subjects were exposed, over a 7 day training period, to a total of 70 repeated bouts of exercise paired with a simultaneous airway CO2 load to stimulate the chemoreceptors (protocol EX + CO2). The ventilatory response to exercise was measured before and after training to determine whether it had been modified. Two further training protocols were undertaken as controls. One employed repeated exercise without an airway CO2 load, and the other employed repeated airway CO2 loading without exercise. On the 1st and 2nd days following training with protocol EX + CO2, end-tidal P CO2 was regulated at a lower level during steady-state exercise than following training with the control protocols and than before training (mean ±s.e.m. reduction in end-tidal P CO2 = 1.32 ± 0.36 Torr, ANOVA, P < 0.05). In contrast to previous studies, this finding demonstrates that the steady-state ventilatory response to exercise can be modified by a prior period of altered chemoreception during exercise. This suggests that ventilation is matched to metabolic rate during exercise by a mechanism that involves learning and memory.
Related Links	http://dx.doi.org/10.1113/jphysiol.2003.047597
Ending Page	974
Page Count	8
Starting Page	967
File Format	PDF
ISSN	00223751
e-ISSN	14697793
Journal	The Journal of Physiology
Issue Number	Pt 3
Volume Number	553
Language	English
Publisher	Blackwell Science Inc
Publisher Date	2003-12-01
Access Restriction	Open
Rights Holder	Blackwell Science Inc
Subject Keyword	Physiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Sports Science

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