Research article summary (published 30 Dec 2007):

The effects of different stretch amplitudes on electromyographic activity during drop jumps.

Full Abstract

The purpose of this study was to investigate the effects of different stretch amplitudes (angular displacements) on the performance and electromyographic (EMG) activity during drop jumps (DJs). The AMTI force platform, the Biovision electrical goniometer, and EMG system were used to record the ground reaction forces, knee angular displacement, and the EMG signals of the rectus femoris. The EMG data were treated by different data-processing methods: the biphase and triphase data-processing methods. The results revealed that the short-stretch DJs had a larger passive force, a higher eccentric end force, a higher concentric average force, and a faster eccentric angular velocity showing a more efficient stretch-shortening cycle (SSC) mechanism in using elastic energy and reactive properties than the long-stretch DJs. Therefore, the short-stretch DJs are recommended in training for the SSC movement. However, the results of biphase data-processing EMG method did not support this conclusion because there was no significant difference between long-stretch DJs and short-stretch DJs by using the biphase data-processing method, whereas the triphase method did support this conclusion and demonstrated that short-stretch DJs are more efficient.

Author information

Author/s: Lin, Jenq-Dong (JD); Liu, Yu (Y); Lin, Jenq-Charng (JC); Tsai, Feng-Jen (FJ); Chao, Chun-Yu (CY);

Affiliation: Department of Physical Education, Kainan University, Taoyuan, Taiwan.

Journal and publication information

Publication Type: Journal Article

Journal: Journal of strength and conditioning research / National Strength & Conditioning Association (J Strength Cond Res), published in United States. (Language: eng)

Reference: 2008-Jan; vol 22 (issue 1) : pp 32-9

Dates: Created 2008/02/25; Completed 2008/04/07; Revised 2008/11/21;

PMID: 18296953, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult Cohort Studies Electromyography - methods Humans Lower Extremity - physiology Male Muscle Contraction - physiology

Muscle Stretching Exercises Muscle, Skeletal - physiology Physical Education and Training - methods Physical Exertion Probability Sensitivity and Specificity Sports - physiology

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