Effect of a Short Time Concentric Versus Eccentric Training Program on Electromyography Activity and Peak Torque of Quadriceps

• Authors: Alberto Carvalho , Paolo Caserotti , Carlos Carvalho , Eduardo Abade , Jaime Sampaio
• Languages of publication: EN

Abstracts

EN

The purpose of this study was to examine the effect of an 8-week concentric (CON) versus eccentric (ECC) isokinetic training program on the electromyography (EMG) signal amplitude of vastus medialis (VM), vastus lateralis (VL) and rectus femoris (RF). Also, the isometric (ISO) and dynamic maximum strength of the knee extensors were assessed. Eighteen physically healthy male subjects (age 22 ± 1 years, body height 177 ± 4 cm, body mass 73 ± 7 kg) performed four weeks of unilateral CON isokinetic training for the quadriceps of the dominant leg on a REV9000 dynamometer. At the end of the fourth week, the sample was divided into two groups, with one group performing additional four weeks of unilateral ECC training and the other continuing with CON training. The training sessions consisted of three sets of ten maximal repetitions at a velocity of 60°s-1, three days per week for eight weeks. The results showed that CON and ECC groups improved the peak torque in all types of contractions. Also, both groups presented increases in the avgEMG for VL, VM and RF. The present investigation showed that CON training elicited increases of the ISO peak torque and VM avgEMG in the CON contraction. Additionally, significant gains were reported after the ECC training on the VM avgEMG in all contractions and RM avgEMG in CON contraction.

Keywords

EN

Isokinetic training; quadriceps; hamstring; peak torque; imbalance ratios

• Publisher: De Gruyter Open
• Journal: Journal of Human Kinetics
• Year: 2014
• Volume: 41
• Issue: 1
• Pages: 5-13

Dates

accepted

1 - 6 - 2014

online

8 - 7 - 2014

Contributors

author

Alberto Carvalho

• –Research Center of Sports Science, Health and Human Development (CIDESD).
• –High Institute of Maia (ISMAI), Portugal.

author

Paolo Caserotti

• University of Southern Denmark, Odense, Denmark.

author

Carlos Carvalho

• –Research Center of Sports Science, Health and Human Development (CIDESD).
• –High Institute of Maia (ISMAI), Portugal.

author

Eduardo Abade

• –Research Center of Sports Science, Health and Human Development (CIDESD).
• –University of Trds-os-Montes e Alto Douro (UTAD), Portugal.

author

Jaime Sampaio

• –Research Center of Sports Science, Health and Human Development (CIDESD).
• –University of Trds-os-Montes e Alto Douro (UTAD), Portugal.

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Identifiers

DOI

10.2478/hukin-2014-0027