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Title: Anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise
Authors: Gorostiaga, Esteban M.
Navarro-Amézqueta, Ion
Cusso, Roser
Hellsten, Ylva
Calbet, Jose A L 
Guerrero, Mario
Granados, Cristina
González-Izal, Miriam
Ibáñez, Javier
Izquierdo, Mikel
UNESCO Clasification: 241106 Fisiología del ejercicio
Keywords: Lactate
Issue Date: 2010
Journal: PLoS ONE 
Abstract: Information about anaerobic energy production and mechanical efficiency that occurs over time during short-lasting maximal exercise is scarce and controversial. Bilateral leg press is an interesting muscle contraction model to estimate anaerobic energy production and mechanical efficiency during maximal exercise because it largely differs from the models used until now. This study examined the changes in muscle metabolite concentration and power output production during the first and the second half of a set of 10 repetitions to failure (10RM) of bilateral leg press exercise. On two separate days, muscle biopsies were obtained from vastus lateralis prior and immediately after a set of 5 or a set of 10 repetitions. During the second set of 5 repetitions, mean power production decreased by 19% and the average ATP utilisation accounted for by phosphagen decreased from 54% to 19%, whereas ATP utilisation from anaerobic glycolysis increased from 46 to 81%. Changes in contraction time and power output were correlated to the changes in muscle Phosphocreatine (PCr; r = -0.76; P<0.01) and lactate (r = -0.91; P<0.01), respectively, and were accompanied by parallel decreases (P<0.01-0.05) in muscle energy charge (0.6%), muscle ATP/ADP (8%) and ATP/AMP (19%) ratios, as well as by increases in ADP content (7%). The estimated average rate of ATP utilisation from anaerobic sources during the final 5 repetitions fell to 83% whereas total anaerobic ATP production increased by 9% due to a 30% longer average duration of exercise (18.4 +/- 4.0 vs 14.2 +/- 2.1 s). These data indicate that during a set of 10RM of bilateral leg press exercise there is a decrease in power output which is associated with a decrease in the contribution of PCr and/or an increase in muscle lactate. The higher energy cost per repetition during the second 5 repetitions is suggestive of decreased mechanical efficiency.
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0013486
Source: Plos One [ISSN 1932-6203],v. 5 (e13486)
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Anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise
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