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

Vassallo, Christian; Gray, Adrian; Cummins, Cloe; Murphy, Aron; Waldron, Mark

doi:10.1007/s00421-019-04266-8

Author(s)

Vassallo, Christian

Gray, Adrian

Cummins, Cloe

Murphy, Aron

Waldron, Mark

Publication Date

2020-01

Abstract

Purpose We compared a new locomotor-specific model to track the expenditure and reconstitution of work done above critical power (W´) and balance of W´ (W´BAL) by modelling flat over-ground power during exhaustive intermittent running. Method 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 (SCWR) at the maximum oxygen uptake velocity (vV̇O2max). Four intermittent trials followed: 60-s at vV̇O2max + 50% Δ1 (Δ1 = vV̇O2max − critical velocity [VCrit]) interspersed by 30-s in light (SL; 40% vV̇O2max), moderate (SM; 90% gas-exchange threshold velocity [VGET]), heavy (SH; VGET + 50% Δ2 [Δ2 = VCrit − VGET]), or severe (SS; vV̇O2max − 50% Δ1) domains. Data from Global Positioning Systems were derived to model over-ground power. The difference between critical and recovery power (DCP), time constant for reconstitution of W´ (τW′), time to limit of tolerance (TLIM), and W´BAL from the integral (W´BALint), differential (W´BALdiff), and locomotor-specific (OG-W´BAL) methods were compared.Results The relationship between τW′ and DCP was exponential (r2 = 0.52). The τW′ for SL, SM, and SH trials were 119 ± 32-s, 190 ± 45-s, and 336 ± 77-s, respectively. Actual TLIM in the 30–15 IFT (968 ± 117-s) compared closely to TLIM predicted by OG-W´BAL (929 ± 94-s, P > 0.100) and W´BALdiff (938 ± 84-s, P > 0.100) but not to W´BALint (848 ± 91-s, P = 0.001). Conclusion The OG-W´BAL accurately tracked W´ kinetics during intermittent running to exhaustion on flat surfaces.

Citation

European Journal of Applied Physiology, 120(1), p. 219-230

ISSN

1439-6327

1439-6319

Pubmed ID

31776696

Link

https://hdl.handle.net/1959.11/42473

Language

en

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

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	https://hdl.handle.net/1959.11/42473
Language	en
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

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

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