ORCID Profile
0000-0003-2130-6247
Current Organisation
Chiang Mai University
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Publisher: Wiley
Date: 15-12-2010
DOI: 10.1113/EXPPHYSIOL.2009.048975
Abstract: The contribution of respiratory muscle O2 uptake ((.)V(O2RM)) to the development of the slow component of O2 uptake kinetics ((.)V(O2SC)) is unclear. The aim of the present study was to examine the impact of respiratory muscle unloading (via breathing, a He-O2 mixture) on the litude of (.)V(O2SC) during exercise performed below (B-RCT) and above the respiratory compensation threshold (A-RCT). We hypothesized that breathing He-O2 would reduce the litude of the (.)V(O2SC) by a greater amount during exercise performed A-RCT than B-RCT. Eight healthy male recreational cyclists performed constant load cycling in four sets of conditions: (1) B-RCT breathing normal air (2) B-RCT breathing He-O2 (3) A-RCT breathing normal air and (4) A-RCT breathing He-O2. Breathing He-O2 did not significantly attenuate the (.)V(O2SC) during exercise performed B-RCT (-3+/-14%, P >0.05). However, breathing He-O2 significantly reduced the (.)V(O2SC) during exercise A-RCT(-45+/-6%, P <0.05). The attenuated (.)V(O2SC) while breathing He-O2 is likely to reflect a decreased (.)V(O2RM). Minute ventilation was not +/-different between normal air and He-O2 breathing trials either B-RCT or A-RCT. However, operating lung volume was significantly lower when breathing He-O2 during exercise performed A-RCT (-12+/-3%, P <0.05). These findings suggest that (.)V(O2RM) comprises a greater proportion of the (.)V(O2SC) when exercise is performed A-RCT compared with B-RCT. Therefore, the impact of breathing He-O2 was more pronounced during exercise A-RCT. Furthermore, changes in operating lung volume and the work of breathing appear to play an important role in the development of the (.)V(O2SC).
Publisher: Kasetsart University and Development Institute
Date: 2018
Publisher: Elsevier BV
Date: 09-2010
DOI: 10.1016/J.RESP.2010.06.018
Abstract: We examined the influence of operational lung volumes and mean inspiratory flow on the litude of the slow component of O₂uptake (V(O)₂(SC) ) during constant-load cycling performed below and above the respiratory compensation threshold (RCT) in young (24±1yr), healthy in iduals (n=10). Subjects demonstrated a significantly greater rise in expiratory reserve volume (ERV) and mean inspiratory flow over the V(O)₂(SC) 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 V(O)₂(SC) litude between work rates (R(2)=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 V(O)₂(SC') , particularly when exercise is performed above the RCT.
Publisher: Centre for Evaluation in Education and Science (CEON/CEES)
Date: 2018
No related grants have been discovered for Manisa Piuchan.