Ferguson, C, Wylde, LA, Benson, AP et al. (2 more authors) (2016) No reserve in isokinetic cycling power at intolerance during ramp incremental exercise in endurance-trained men. Journal of Applied Physiology, 120 (1). pp. 70-77. ISSN 8750-7587
Abstract
During whole-body exercise in health, maximal oxygen uptake (V̇O2max) is typically attained at or immediately prior to the limit of tolerance (LoT). At the V̇O2max and LoT of incremental exercise, a fundamental, but unresolved, question is whether maximal evocable power can increase above the task requirement, i.e. whether there is a "power reserve" at the LoT. Using an instantaneous switch from cadence-independent to isokinetic cycle ergometry, we determined maximal evocable power at the limit of ramp-incremental exercise. We hypothesized that in endurance-trained men at LoT, maximal (4s) isokinetic power would not differ from power required by the task. Baseline isokinetic power at 80rpm (PISO; measured at the pedals) and summed integrated EMG from 5 leg muscles (∑iEMG) were measured in 12 endurance-trained men (V̇O2max=4.2±1.0 l•min(-1)). Participants then completed a ramp-incremental exercise test (20-25W•min(-1)), with instantaneous measurement of PISO and ∑iEMG at the LoT. PISO decreased from 788±103W at baseline to 391±72W at LoT, which was not different from the required ramp-incremental flywheel power (352±58W; p>0.05). At LoT, the relative reduction in PISO was greater than the relative reduction in the isokinetic ∑iEMG (50±9 vs. 63±10% of baseline; p<0.05). During maximal ramp incremental exercise in endurance-trained men, maximum voluntary power is not different from the power required by the task, and is consequent to both central and peripheral limitations in evocable power. The absence of a power reserve suggests both the perceptual and physiological limits of maximum voluntary power production are not widely dissociated at LoT in this population.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 the American Physiological Society. Licensed under Creative Commons Attribution CC-BY 3.0 (http://creativecommons.org/licenses/by/3.0/deed.en_US). |
Keywords: | Central fatigue, Peripheral fatigue, V̇O2max, Electromyography, Exercise tolerance |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Biological Sciences (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 03 Dec 2015 11:19 |
Last Modified: | 13 Mar 2016 16:14 |
Published Version: | http://dx.doi.org/10.1152/japplphysiol.00662.2015 |
Status: | Published |
Publisher: | American Physiological Society |
Identification Number: | 10.1152/japplphysiol.00662.2015 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:92423 |