Indirect measures of substrate utilisation following exercise-induced muscle damage

Journal article


Hughes, Jonathan, Chapman, Phillip, Brown, Stephen, Johnson, Nathan and Stannard, Stephen. (2013). Indirect measures of substrate utilisation following exercise-induced muscle damage. European Journal of Sport Science. 13(5), pp. 509-517. https://doi.org/10.1080/17461391.2012.755570
AuthorsHughes, Jonathan, Chapman, Phillip, Brown, Stephen, Johnson, Nathan and Stannard, Stephen
Abstract

This study investigated whether exercise-induced muscle damage (EIMD) resulted in changes to whole-body substrate utilisation during exercise performed during the subsequent 48 hours. Eight males (31±6 years) performed 30 minutes of bench-stepping exercise. One leg performed eccentric contractions (Ecc) by lowering the body whilst the control leg performed concentric contractions (Con) by raising the body. On the two days following bench-stepping exercise participants performed measures of muscle function on an isokinetic dynamometer and undertook a bout of one leg cycling exercise, at two differing workloads, with the first workload (WL1) at 1.5±0.25 W/kg and the second workload (WL2) at 1.8±0.25 W/kg with each leg. Expired respiratory gases were collected during cycling to estimate whole body substrate utilisation. There were significant decrements in measures of muscular performance (isometric force, concentric and eccentric torque) and increased perception of soreness in Ecc compared with Con (P < 0.05). The effect of the Ecc treatment on substrate utilisation during one-legged cycling revealed a significant trial×time interaction with higher rates of CHO oxidation in the Ecc condition compared with Con that were further increased 48 hours later (P = 0.02). A significant treatment×time×effort interaction (P < 0.01) indicated the effect of the treatment altered as workload increased with higher rates of CHO oxidation occurring in WL2. This is consistent with greater reliance upon muscle glycogen. Suggesting that in EIMD, reductions in strength and increased feelings of soreness can be associated with greater reliance upon intramuscular CHO oxidation, than lipid, during subsequent concentric work.

Keywordseccentric exercise; metabolism; respiratory exchange ratio
Year2013
JournalEuropean Journal of Sport Science
Journal citation13 (5), pp. 509-517
PublisherRoutledge
ISSN1746-1391
Digital Object Identifier (DOI)https://doi.org/10.1080/17461391.2012.755570
Scopus EID2-s2.0-84887988870
Open accessPublished as green open access
Page range509-517
Research GroupSports Performance, Recovery, Injury and New Technologies (SPRINT) Research Centre
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Open
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Output statusPublished
Publication dates
Online11 Jan 2013
Publication process dates
Accepted27 Nov 2012
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