Volume 19, Issue 2 pp. 229-232
Article
Free Access

Effect of high-intensity running in rectus femoris muscle fiber in rats

Pilar Díaz-Herrera

Corresponding Author

Pilar Díaz-Herrera

Departamento de Morfología, Facultad de Medicina, Universidad de Las Palmas de Gran Canaria, Spain

Departamento de Morfología, Facultad de Medicina, Universidad de Las Palmas de Gran Canaria, Spain, Tel.: +34-928-45-14-36; fax: +34-928-45-34-20Search for more papers by this author
José M. García-Castellano

José M. García-Castellano

Departamento de Morfología, Facultad de Medicina, Universidad de Las Palmas de Gran Canaria, Spain

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Ana Torres

Ana Torres

Departamento de Ciencias Morfológicas, Facultad de Medicina, Universidad de Zaragoza, Spain

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José A. Morcuende

José A. Morcuende

Department of Orthopedic Surgery, Iowa Hospital & Clinics, Iowa City, IA, USA

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José A. L. Calbet

José A. L. Calbet

Departamento de Educación Fisica, Facultad de Ciencias de la Actividad Física y del Deporte, Universidad de Las Palmas de Gran Canaria, Spain

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René Sarrat

René Sarrat

Departamento de Ciencias Morfológicas, Facultad de Medicina, Universidad de Zaragoza, Spain

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First published: 01 January 2006
Citations: 6

Abstract

The effect of a 12-week high-intensity intermittent exercise program on fiber type composition and the oxidative capacity of rectus femoris skeletal muscle from 20 male Wistar rats (Trained, n = 10; Sedentary, n = 10) was histochemically determined. The training exercise program was developed in a motorized treadmill. It consisted of four running bouts of 2 min duration at 48 m/min, alternated with recovery intervals of 4 min. Training increased relative cross-sectional area of oxidative fibers (I, IIA, IIX) and decreased the same parameter in type IIB non-oxidative fibers (P < 0.001). Our results suggest that this type of strength exercise program is enough to induce changes in muscle fiber composition. This opens a possibility to use this kind of exercise in preventing and treating muscle atrophy. © 2001 Orthopaedic Research Society. Published by Elsevier Science Ltd. All rights reserved.

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