Selective hypertrophy of the quadriceps musculature after 14 weeks of isokinetic and conventional resistance training
| Autor: | Roberto Simão, Jeffrey M. Willardson, Gabriel S. Trajano, Francisco Xavier Monteiro Bezerra do Nascimento, Liliam Fernandes de Oliveira, Thiago Torres da Matta |
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| Rok vydání: | 2015 |
| Předmět: |
Male
Muscle Strength Dynamometer medicine.medical_specialty Time Factors Physiology Strength training Isometric torque Isometric exercise Quadriceps Muscle Muscle hypertrophy Young Adult 03 medical and health sciences 0302 clinical medicine Physical medicine and rehabilitation Isometric Contraction Physiology (medical) medicine Humans Muscle Strength Ultrasonography business.industry Ultrasound Resistance training Resistance Training Hypertrophy 030229 sport sciences General Medicine Anatomy Adaptation Physiological Treatment Outcome Torque Isokinetic dynamometer business Brazil 030217 neurology & neurosurgery |
| Zdroj: | Clinical Physiology and Functional Imaging. 37:137-142 |
| ISSN: | 1475-0961 |
| DOI: | 10.1111/cpf.12277 |
| Popis: | One of the fundamental adaptations observed with resistance training (RT) is muscle hypertrophy. Conventional and isokinetic machines provide different forms of mechanical stress, and it is possible that these two training modes could promote differing degrees of hypertrophic adaptations. There is a lack of data comparing the selective hypertrophy of the quadriceps musculature after training with a conventional knee extension machine versus an isokinetic machine. The purpose of this study was to evaluate the selective hypertrophy of the quadriceps musculature and knee extension maximal isometric torque after 14 weeks of conventional versus isokinetic RT. Thirty-five men were assigned to three groups: control group and training groups (conventional and isokinetic) performed three sets of unilateral knee extensions per session with a progressive loading scheme twice a week. Prior to and following the intervention, maximal isometric knee extensor torque was measured using an isokinetic dynamometer, and muscle thickness (MT) of quadriceps femoris muscles was assessed via ultrasound. The results indicated non-uniform changes in MT between the muscles that comprise the quadriceps femoris group. For the conventional group, significantly greater increases in rectus femoris thickness were evident versus all other quadriceps muscles (14%). For the isokinetic group, increases in RF thickness (11%) were significantly greater in comparison with the vastus intermedius only. Although the muscle thickness did not increase for all the quadriceps femoris muscles, the relative rectus femoris adaptation suggested a selective hypertrophy favouring this portion. |
| Databáze: | OpenAIRE |
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