Anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise.

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 max...

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Autores principales:	Esteban M Gorostiaga, Ion Navarro-Amézqueta, Roser Cusso, Ylva Hellsten, Jose A L Calbet, Mario Guerrero, Cristina Granados, Miriam González-Izal, Javier Ibáñez, Mikel Izquierdo
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2010
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/89365abd1857432a80cf589f430acbdc
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spelling	oai:doaj.org-article:89365abd1857432a80cf589f430acbdc2021-11-18T07:03:07ZAnaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise.1932-620310.1371/journal.pone.0013486https://doaj.org/article/89365abd1857432a80cf589f430acbdc2010-10-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20976067/?tool=EBIhttps://doaj.org/toc/1932-6203Information 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.Esteban M GorostiagaIon Navarro-AmézquetaRoser CussoYlva HellstenJose A L CalbetMario GuerreroCristina GranadosMiriam González-IzalJavier IbáñezMikel IzquierdoPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 5, Iss 10, p e13486 (2010)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Esteban M Gorostiaga Ion Navarro-Amézqueta Roser Cusso Ylva Hellsten Jose A L Calbet Mario Guerrero Cristina Granados Miriam González-Izal Javier Ibáñez Mikel Izquierdo Anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise.
description	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.
format	article
author	Esteban M Gorostiaga Ion Navarro-Amézqueta Roser Cusso Ylva Hellsten Jose A L Calbet Mario Guerrero Cristina Granados Miriam González-Izal Javier Ibáñez Mikel Izquierdo
author_facet	Esteban M Gorostiaga Ion Navarro-Amézqueta Roser Cusso Ylva Hellsten Jose A L Calbet Mario Guerrero Cristina Granados Miriam González-Izal Javier Ibáñez Mikel Izquierdo
author_sort	Esteban M Gorostiaga
title	Anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise.
title_short	Anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise.
title_full	Anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise.
title_fullStr	Anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise.
title_full_unstemmed	Anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise.
title_sort	anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise.
publisher	Public Library of Science (PLoS)
publishDate	2010
url	https://doaj.org/article/89365abd1857432a80cf589f430acbdc
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Anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise.

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