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Plyometric vs. isometric training influences on tendon properties and muscle output.

Burgess, Katherine E.; Connick, Mark J.; Graham-Smith, Philip; Pearson, Stephen J.

Authors

Mark J. Connick

Philip Graham-Smith

Stephen J. Pearson



Abstract

The purpose of this study was to concurrently determine the effect that plyometric and isometric training has on tendon stiffness (K) and muscle output characteristics to compare any subsequent changes. Thirteen men trained the lower limbs either plyometrically or isometrically 2–3 times a week for a 6-week period. Medial gastrocnemius tendon stiffness was measured in vivo using ultrasonography during ramped isometric contractions before and after training. Mechanical output variables were measured using a force plate during concentric and isometric efforts. Significant (p < 0.05) training-induced increases in tendon K were seen for the plyometric (29.4%; 49.0 < 10.8 to 63.4 < 9.2 N·mm-1) and isometric groups (61.6%; 43.9 < 2.5 to 71.0 < 7.4 N·mm-1). Statistically similar increases in rate of force development and jump height were also seen for both training groups, with increases of 18.9 and 58.6% for the plyometric group and 16.7 and 64.3% for the isometric group, respectively. Jump height was found to be significantly correlated with tendon stiffness, such that stiffness could explain 21% of the variance in jump height. Plyometric training has been shown to place large stresses on the body, which can lead to a potential for injury, whereas explosive isometric training has been shown here to provide similar benefits to that of plyometric training with respect to the measured variables, but with reduced impact forces, and would therefore provide a useful adjunct for athletic training programs within a 6-week time frame.

Citation

BURGESS, K.E., CONNICK, M.J., GRAHAM-SMITH, P. and PEARSON, S.J. 2007. Plyometric vs isometric training influences on tendon properties and muscle output. Journal of strength and conditioning research [online], 21(3), pages 986-989. Available from: https://doi.org/10.1519/R-20235.1

Journal Article Type Article
Online Publication Date Aug 31, 2007
Publication Date Aug 31, 2007
Deposit Date Sep 4, 2023
Publicly Available Date Jan 30, 2024
Journal Journal of Strength and Conditioning Research
Print ISSN 1064-8011
Electronic ISSN 1533-4287
Publisher Lippincott, Williams & Wilkins
Peer Reviewed Peer Reviewed
Volume 21
Issue 3
Pages 986-989
DOI https://doi.org/10.1519/R-20235.1
Keywords Tendon stiffness; Rate of force development; Exercise
Public URL https://rgu-repository.worktribe.com/output/2060333

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Copyright Statement
© 2007 National Strength and Conditioning Association. This is a pre-copyedited, author-produced version of an article accepted for publication in Journal of Strength and Conditioning Research. The published version of record BURGESS, K.E., CONNICK, M.J., GRAHAM-SMITH, P. and PEARSON, S.J. 2007. Plyometric vs isometric training influences on tendon properties and muscle output. Journal of strength and conditioning research, 21(3), pages 986-989 is available online at: https://doi.org/10.1519/R-20235.1





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