Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/50979
Título: Effects of training status on fibers of the musculus vastus lateralis in professional road cyclists
Autores/as: Rodriguez, Luis P.
López-Rego, Jacobo
Calbet, J. A.L. 
Valero, Raquel
Varela, Enrique
Ponce, Julio
Clasificación UNESCO: 241106 Fisiología del ejercicio
Palabras clave: Adult
Human
Muscle
Muscle Fibers
Mitochondria, et al.
Fecha de publicación: 2002
Editor/a: 0894-9115
Publicación seriada: American Journal of Physical Medicine and Rehabilitation 
Resumen: Objective To evaluate possible changes occurring in muscle fibers related to the training status of professional road cyclists. Design A comparative study was performed on two groups of male road cyclists: ten 21-yr-old cyclists with a history of 3 yr of sport competition (RC21) and ten 25-yr-old cyclists with a history of 7 yr of competition (RC25). The control group was formed by two subgroups of five nontrained, sedentary volunteers who were matched for age with the study subjects (NT21 and NT25). Biopsies of the vastus lateralis muscle were obtained to determine the fiber variables: percentage, cross-sectional area, mitochondrial volume, and capillary density. Results Control group variables were within the normal range. According to their training status, cyclists showed an increased percentage of type I and IIC fibers (RC25 > RC21 > NT) and decreased percentage of type IIA (RC25 < RC21 < NT) and IIB fibers (RC25 = RC21 < NT), an increased cross-sectional area of all fiber types after 3 yr of training (RC25 = RC21 > NT) except IIB fibers (RC25 > RC21), an increased mitochondrial volume in all fiber types (RC25 > RC21 > NT) except type IIA fibers (RC25 > RC21 = NT21), and an increased capillary density (RC25 > RC21 > NT). Conclusions Findings indicate a progressive increase in the muscle fiber types that are mostly implicated in endurance sports, accompanied by phenotypic changes in the fiber population of lesser participation.
URI: http://hdl.handle.net/10553/50979
ISSN: 0894-9115
DOI: 10.1097/00002060-200209000-00004
Fuente: American Journal of Physical Medicine and Rehabilitation[ISSN 0894-9115],v. 81, p. 651-660
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