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

Burgess, Katherine E., Connick, Mark J., Graham-Smith, Philip and Pearson, Stephen J. (2007) Plyometric vs. isometric training influences on tendon properties and muscle output. Journal of Strength and Conditioning Research, 21 3: 986-989. doi:10.1519/00124278-200708000-00055

Author Burgess, Katherine E.
Connick, Mark J.
Graham-Smith, Philip
Pearson, Stephen J.
Title Plyometric vs. isometric training influences on tendon properties and muscle output
Journal name Journal of Strength and Conditioning Research   Check publisher's open access policy
ISSN 1533-4287
Publication date 2007-01-01
Sub-type Article (original research)
DOI 10.1519/00124278-200708000-00055
Open Access Status Not Open Access
Volume 21
Issue 3
Start page 986
End page 989
Total pages 4
Place of publication Philadelphia, PA, United States
Publisher Lippincott Williams & Wilkins
Language eng
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.
Keyword Exercise
Rate of force development
Tendon stiffness
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Human Movement and Nutrition Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 64 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 22 May 2012, 20:48:18 EST by Dr Mark Connick on behalf of School of Human Movement and Nutrition Sciences