Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/50938
Título: Energy metabolism during repeated sets of leg press exercise leading to failure or not
Autores/as: Gorostiaga, Esteban M.
Navarro-Amézqueta, Ion
Calbet, Jose A. L. 
Hellsten, Ylva
Cusso, Roser
Guerrero, Mario
Granados, Cristina
González-Izal, Miriam
Ibañez, Javier
Izquierdo, Mikel 
Clasificación UNESCO: 241106 Fisiología del ejercicio
Palabras clave: Muscle Glycogen-Phosphorylase
Activated Protein-Kinase
Skeletal-Muscle
Resistance Exercise
Maximal Exercise, et al.
Fecha de publicación: 2012
Publicación seriada: PLoS ONE 
Resumen: 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 (R2 = 0.46), between changes in muscle PCr and IMP (R2 = 0.44) as well as between changes in power output and changes in muscle ATP (R2 = 0.59) and lactate (R2 = 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.
URI: http://hdl.handle.net/10553/50938
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0040621
Fuente: Plos One[ISSN 1932-6203],v. 7 (7)
Colección:Artículos
miniatura
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