Influence of extreme pedal rates on pulmonary O2 uptake kinetics during transitions to high-intensity exercise from an elevated baseline

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dc.contributor.author DiMenna, Fred J.
dc.contributor.author Wilkerson, Daryl P.
dc.contributor.author Burnley, Mark
dc.contributor.author Bailey, Stephen J.
dc.contributor.author Jones, Andrew M.
dc.date.accessioned 2009-11-30T13:07:46Z
dc.date.available 2009-11-30T13:07:46Z
dc.date.issued 2009-10-31
dc.identifier.citation DiMenna , F J , Wilkerson , D P , Burnley , M , Bailey , S J & Jones , A M 2009 , ' Influence of extreme pedal rates on pulmonary O2 uptake kinetics during transitions to high-intensity exercise from an elevated baseline ' Respiration Physiology and Neurobiology , vol 169 , no. 1 , pp. 16-23 . , 10.1016/j.resp.2009.08.001 en
dc.identifier.other PURE: 142257
dc.identifier.other dspace: 2160/3735
dc.identifier.uri http://hdl.handle.net/2160/3735
dc.identifier.uri http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6X16-4WYDN26-2&_user=427455&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000020498&_version=1&_urlVersion=0&_userid=427455&md5=48a51bc2495a975f458b8bdb314a1cd8 en
dc.description DiMenna F.J., Wilkerson, D.P., Burnley, M., Bailey, S.J. & Jones, A.M. (2009). Influence of extreme pedal rates on pulmonary O2 uptake kinetics during transitions to high-intensity exercise from an elevated baseline. Respiration Physiology and Neurobiology, 169, 16-23. This paper demonstrated that both exercise intensity and muscle contractile frequency can influence the kinetics of . Specifically, at low contraction frequencies, the influence of transitions to moderate vs. heavy exercise was blunted, whereas they were amplified at high contraction frequencies. When the transition occurred from an elevated (moderate) baseline, the same effect was seen, suggesting that the interpretation of the response is dependent on the contractile frequency adopted. en
dc.description.abstract We used extreme pedal rates to investigate the influence of muscle fibre recruitment on pulmonary VO2 kinetics during unloaded-to-moderate-intensity (U → M), unloaded-to-high-intensity (U → H), and moderate-intensity to high-intensity (M → H) cycling transitions. Seven healthy men completed transitions to 60% of the difference between gas-exchange threshold and peak VO2 from both an unloaded and a moderate-intensity (95% GET) baseline at cadences of 35 and 115 rpm. Pulmonary gas exchange was measured breath-by-breath and iEMG of the m. vastus lateralis and m. gluteus maximus was measured during all tests. At 35 rpm, the phase II time constant (τp) values for U → M, U → H, and M → H were 26 ± 7, 31 ± 7 and 36 ± 8 s with the value for M → H being longer than for U → M (P <0.05). At 115 rpm, the τp values for U → M, U → H, and M → H were 29 ± 8, 48 ± 16 and 53 ± 20 s with the value for U → M being shorter than for the other two conditions (P <0.05). The VO2 slow component was similar at both cadences, but iEMG only increased beyond minute 2 during high-intensity cycling at 115 rpm. These results demonstrate that VO2 kinetics are influenced by an interaction of exercise intensity and pedal rate and are consistent with the notion that changes in muscle fibre recruitment are responsible for slower phase II VO2 kinetics during high-intensity and work-to-work exercise transitions. en
dc.format.extent 8 en
dc.language.iso eng
dc.relation.ispartof Respiration Physiology and Neurobiology en
dc.subject Kinetics en
dc.subject Phase II time constant en
dc.subject Slow component en
dc.subject Work-to-work exercise en
dc.subject Cadence en
dc.title Influence of extreme pedal rates on pulmonary O2 uptake kinetics during transitions to high-intensity exercise from an elevated baseline en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1016/j.resp.2009.08.001
dc.contributor.institution Department of Sport & Exercise Science en
dc.description.status Peer reviewed en


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