Nederveen, JP, Keir, DA, Love, LK et al. (2 more authors) (2017) Effect of heavy-intensity 'priming' exercise on oxygen uptake and muscle deoxygenation kinetics during moderate-intensity step-transitions initiated from an elevated work rate. Respiratory Physiology & Neurobiology, 235. pp. 62-70. ISSN 1569-9048
Abstract
We examined the effect of heavy-intensity ‘priming’ exercise on the rate of adjustment of pulmonary O2 uptake (τ 2p) initiated from elevated intensities. Fourteen men (separated into two groups: τ 2p≤25s [Fast] or τ 2p>25s [Slow]) completed step-transitions from 20W-to- 45%lactate threshold (LT; lower-step, LS) and 45%-to-90%LT (upper-step, US) performed (i) without; and (ii) with US preceded by heavy-intensity exercise (HUS). Breath-by-breath 2p and near-infrared spectroscopy-derived muscle deoxygenation ([HHb+Mb]) were measured. Compared to LS, τ 2p was greater (p<0.05) in US in both Fast (LS, 19±4s; US, 30±4s) and Slow (LS, 25±5s; US, 40±11s) with τ 2p in US being lower (p<0.05) in Fast. In HUS, τ 2p in Slow was reduced (28±8s, p<0.05) and was not different (p>0.05) from LS or Fast group US. In Slow, τ[HHb+Mb] increased (p<0.05) in US relative to HUS; this finding coupled with a reduced τ 2p indicates a priming-induced improvement in matching of muscle O2 delivery-to-O2 utilization during transitions from elevated intensities in those with Slow but not Fast 2p kinetics.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 Elsevier B.V. All rights reserved. This is an author produced version of a paper published in Respiratory Physiology & Neurobiology. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | O2 uptake kinetics; near-infrared spectroscopy; muscle oxygenation; priming exercise |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Biological Sciences (Leeds) > School of Biomedical Sciences (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 03 Oct 2016 12:07 |
Last Modified: | 01 Oct 2017 03:27 |
Published Version: | http://dx.doi.org/10.1016/j.resp.2016.09.013 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.resp.2016.09.013 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:105401 |