The influence of breathing mechanics on the development of the slow component of O2 uptake

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Title The influence of breathing mechanics on the development of the slow component of O2 uptake
Author Cross, Troy James; Morris, Norman; Haseler, Luke Jonathon; Schneider, Donald Anthony; Sabapathy, Surendran
Journal Name Respiratory Physiology and Neurobiology
Year Published 2010
Place of publication Netherlands
Publisher Elsevier
Abstract We examined the influence of operational lung volumes and mean inspiratory flow on the amplitude of the slow component of O2 uptake (˙VO2SC ) during constant-load cycling performed below and above the respiratory compensation threshold (RCT) in young (24±1 yr), healthy individuals (n = 10). Subjects demonstrated a significantly greater rise in expiratory reserve volume (ERV) and mean inspiratory flow over the ˙VO2SC period during exercise performed above compared with below the RCT(P < 0.05). Inspiratory reserve volume (IRV) was, on average, smaller for trials performed above relative to below the RCT (P < 0.05). The difference in the magnitudes of change in ERV and mean inspiratory flow, but not IRV, were positively correlated with the increase in ˙VO2SC amplitude between work rates (R2 = 0.86, P < 0.01). These findings suggest that dynamic hyperinflation and mean inspiratory flow (by increasing inspiratory resistive work) contribute to the development of the ˙VO2SC , particularly when exercise is performed above the RCT.
Peer Reviewed Yes
Published Yes
Alternative URI
Volume 173
Issue Number 2
Page from 125
Page to 131
ISSN 1569-9048
Date Accessioned 2010-11-02
Language en_AU
Research Centre Menzies Health Institute Qld; Heart Foundation Research Centre
Faculty Griffith Health Faculty
Subject Exercise Physiology
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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