Exercise tolerance during flat over-ground intermittent running: modelling the expenditure and reconstitution kinetics of work done above critical power

Author(s)
Vassallo, Christian
Gray, Adrian
Cummins, Cloe
Murphy, Aron
Waldron, Mark
Publication Date
2020-01
Abstract
<p><b>Purpose</b> We compared a new locomotor-specific model to track the expenditure and reconstitution of work done above critical power (<i>W´</i>) and balance of <i>W´</i> (<i>W´</i><sub>BAL</sub>) by modelling flat over-ground power during exhaustive intermittent running.</p><p> <b>Method</b> Nine male participants completed a ramp test, 3-min all-out test and the 30–15 intermittent fitness test (30–15 IFT), and performed a severe-intensity constant work-rate trial (<i>S</i><sub>CWR</sub>) at the maximum oxygen uptake velocity (<i>vV̇O</i><sub>2max</sub>). Four intermittent trials followed: 60-s at <i>vV̇O</i><sub>2max</sub> + 50% Δ1 (Δ1 = <i>vV̇O</i><sub>2max</sub> − critical velocity [<i>V</i><sub>Crit</sub>]) interspersed by 30-s in light (<i>S</i><sub>L</sub>; 40% <i>vV̇O</i><sub>2max</sub>), moderate (<i>S</i><sub>M</sub>; 90% gas-exchange threshold velocity [<i>V</i><sub>GET</sub>]), heavy (<i>S</i><sub>H</sub>; <i>V</i><sub>GET</sub> + 50% Δ2 [Δ2 = <i>V</i>Crit − <i>V</i><sub>GET</sub>]), or severe (<i>S</i><sub>S</sub>; <i>vV̇O</i><sub>2max</sub> − 50% Δ1) domains. Data from Global Positioning Systems were derived to model over-ground power. The difference between critical and recovery power (<i>D</i><sub>CP</sub>), time constant for reconstitution of <i>W´</i> (<i>τ</i><sub><i>W′</i></sub>), time to limit of tolerance (<i>T</i><sub>LIM</sub>), and <i>W´</i><sub>BAL</sub> from the integral (<i>W´</i><sub>BALint</sub>), differential (<i>W´</i><sub>BALdiff</sub>), and locomotor-specific (OG-<i>W´</i><sub>BAL</sub>) methods were compared.</p><p><b>Results</b> The relationship between <i>τ</i><sub><i>W′</i></sub> and <i>D</i><sub>CP</sub> was exponential (<i>r</i>2 = 0.52). The <i>τ</i><sub><i>W′</i></sub> for <i>S</i><sub>L</sub>, <i>S</i><sub>M</sub>, and <i>S</i><sub>H</sub> trials were 119 ± 32-s, 190 ± 45-s, and 336 ± 77-s, respectively. Actual <i>T</i><sub>LIM</sub> in the 30–15 IFT (968 ± 117-s) compared closely to <i>T</i><sub>LIM</sub> predicted by OG-<i>W´</i><sub>BAL</sub> (929 ± 94-s, <i>P</i> > 0.100) and <i>W´</i><sub>BALdiff</sub> (938 ± 84-s, </i>P</i> > 0.100) but not to <i>W´</i><sub>BALint</sub> (848 ± 91-s, <i>P</i> = 0.001).</p><p> <b>Conclusion</b> The OG-<i>W´</i><sub>BAL</sub> accurately tracked <i>W´</i> kinetics during intermittent running to exhaustion on flat surfaces.</p>
Citation
European Journal of Applied Physiology, 120(1), p. 219-230
ISSN
1439-6327
1439-6319
Pubmed ID
31776696
Link
Publisher
Springer
Rights
Attribution 4.0 International
Title
Exercise tolerance during flat over-ground intermittent running: modelling the expenditure and reconstitution kinetics of work done above critical power
Type of document
Journal Article
Entity Type
Publication

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