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...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2010-10-01
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| Series: | PLoS ONE |
| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20976067/?tool=EBI |
| _version_ | 1819038177411727360 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-21T08:33:10Z |
| format | Article |
| id | doaj.art-89365abd1857432a80cf589f430acbdc |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-21T08:33:10Z |
| publishDate | 2010-10-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-89365abd1857432a80cf589f430acbdc2022-12-21T19:10:08ZengPublic Library of Science (PLoS)PLoS ONE1932-62032010-10-01510e1348610.1371/journal.pone.0013486Anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise.Esteban M GorostiagaIon Navarro-AmézquetaRoser CussoYlva HellstenJose A L CalbetMario GuerreroCristina GranadosMiriam González-IzalJavier IbáñezMikel IzquierdoInformation 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.https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20976067/?tool=EBI |
| spellingShingle | 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. PLoS ONE |
| title | 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_short | Anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise. |
| title_sort | anaerobic energy expenditure and mechanical efficiency during exhaustive leg press exercise |
| url | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20976067/?tool=EBI |
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