Energy metabolism during repeated sets of leg press exercise leading to failure or not.
This investigation examined the influence of the number of repetitions per set on power output and muscle metabolism during leg press exercise. Six trained men (age 34 ± 6 yr) randomly performed either 5 sets of 10 repetitions (10REP), or 10 sets of 5 repetitions (5REP) of bilateral leg press exerci...
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2012
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oai:doaj.org-article:fc5a6433ed574e2ab243ffed1f403d852021-11-18T07:12:33ZEnergy metabolism during repeated sets of leg press exercise leading to failure or not.1932-620310.1371/journal.pone.0040621https://doaj.org/article/fc5a6433ed574e2ab243ffed1f403d852012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22808209/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203This investigation examined the influence of the number of repetitions per set on power output and muscle metabolism during leg press exercise. Six trained men (age 34 ± 6 yr) randomly performed either 5 sets of 10 repetitions (10REP), or 10 sets of 5 repetitions (5REP) of bilateral leg press exercise, with the same initial load and rest intervals between sets. Muscle biopsies (vastus lateralis) were taken before the first set, and after the first and the final sets. Compared with 5REP, 10REP resulted in a markedly greater decrease (P<0.05) of the power output, muscle PCr and ATP content, and markedly higher (P<0.05) levels of muscle lactate and IMP. Significant correlations (P<0.01) were observed between changes in muscle PCr and muscle lactate (R(2) = 0.46), between changes in muscle PCr and IMP (R(2) = 0.44) as well as between changes in power output and changes in muscle ATP (R(2) = 0.59) and lactate (R(2) = 0.64) levels. Reducing the number of repetitions per set by 50% causes a lower disruption to the energy balance in the muscle. The correlations suggest that the changes in PCr and muscle lactate mainly occur simultaneously during exercise, whereas IMP only accumulates when PCr levels are low. The decrease in ATP stores may contribute to fatigue.Esteban M GorostiagaIon Navarro-AmézquetaJosé A L CalbetYlva HellstenRoser CussoMario GuerreroCristina GranadosMiriam González-IzalJavier IbañezMikel IzquierdoPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 7, p e40621 (2012) |
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Medicine R Science Q |
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Medicine R Science Q Esteban M Gorostiaga Ion Navarro-Amézqueta José A L Calbet Ylva Hellsten Roser Cusso Mario Guerrero Cristina Granados Miriam González-Izal Javier Ibañez Mikel Izquierdo Energy metabolism during repeated sets of leg press exercise leading to failure or not. |
| description |
This investigation examined the influence of the number of repetitions per set on power output and muscle metabolism during leg press exercise. Six trained men (age 34 ± 6 yr) randomly performed either 5 sets of 10 repetitions (10REP), or 10 sets of 5 repetitions (5REP) of bilateral leg press exercise, with the same initial load and rest intervals between sets. Muscle biopsies (vastus lateralis) were taken before the first set, and after the first and the final sets. Compared with 5REP, 10REP resulted in a markedly greater decrease (P<0.05) of the power output, muscle PCr and ATP content, and markedly higher (P<0.05) levels of muscle lactate and IMP. Significant correlations (P<0.01) were observed between changes in muscle PCr and muscle lactate (R(2) = 0.46), between changes in muscle PCr and IMP (R(2) = 0.44) as well as between changes in power output and changes in muscle ATP (R(2) = 0.59) and lactate (R(2) = 0.64) levels. Reducing the number of repetitions per set by 50% causes a lower disruption to the energy balance in the muscle. The correlations suggest that the changes in PCr and muscle lactate mainly occur simultaneously during exercise, whereas IMP only accumulates when PCr levels are low. The decrease in ATP stores may contribute to fatigue. |
| format |
article |
| author |
Esteban M Gorostiaga Ion Navarro-Amézqueta José A L Calbet Ylva Hellsten Roser Cusso Mario Guerrero Cristina Granados Miriam González-Izal Javier Ibañez Mikel Izquierdo |
| author_facet |
Esteban M Gorostiaga Ion Navarro-Amézqueta José A L Calbet Ylva Hellsten Roser Cusso Mario Guerrero Cristina Granados Miriam González-Izal Javier Ibañez Mikel Izquierdo |
| author_sort |
Esteban M Gorostiaga |
| title |
Energy metabolism during repeated sets of leg press exercise leading to failure or not. |
| title_short |
Energy metabolism during repeated sets of leg press exercise leading to failure or not. |
| title_full |
Energy metabolism during repeated sets of leg press exercise leading to failure or not. |
| title_fullStr |
Energy metabolism during repeated sets of leg press exercise leading to failure or not. |
| title_full_unstemmed |
Energy metabolism during repeated sets of leg press exercise leading to failure or not. |
| title_sort |
energy metabolism during repeated sets of leg press exercise leading to failure or not. |
| publisher |
Public Library of Science (PLoS) |
| publishDate |
2012 |
| url |
https://doaj.org/article/fc5a6433ed574e2ab243ffed1f403d85 |
| work_keys_str_mv |
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