Energy metabolism during repeated sets of leg press exercise leading to failure or not
Fecha
2012Autor
Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión publicada / Argitaratu den bertsioa
Impacto
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10.1371/journal.pone.0040621
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 3466 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) we ...
[++]
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 3466 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. [--]
Materias
Muscle metabolism,
Leg press exercise
Editor
Public Library of Science
Publicado en
PLoS ONE 7(7): e40621
Departamento
Universidad Pública de Navarra. Departamento de Ciencias de la Salud /
Nafarroako Unibertsitate Publikoa. Osasun Zientziak Saila
Versión del editor
Entidades Financiadoras
This study was supported by the Spanish Ministry of Education (National Plan of R&D+I 2004–2007, Key action ‘‘Sport and Physical Activity’’ DEP2006-56076). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.