Ankle flexors produce peak torque at longer muscle lengths after whole-body vibration

Kemertzis, M, Lythgo, N, Morgan, D and Galea, M 2008, 'Ankle flexors produce peak torque at longer muscle lengths after whole-body vibration', Medicine and Science in Sports and Exercise, vol. 40, no. 11, pp. 1977-1983.


Document type: Journal Article
Collection: Journal Articles

Title Ankle flexors produce peak torque at longer muscle lengths after whole-body vibration
Author(s) Kemertzis, M
Lythgo, N
Morgan, D
Galea, M
Year 2008
Journal name Medicine and Science in Sports and Exercise
Volume number 40
Issue number 11
Start page 1977
End page 1983
Total pages 7
Publisher Lippincott Williams & Wilkins
Abstract Introduction: Whole-body vibration (WBV) has become a popular training method in recent years. This study investigated the effect of WBV on the length-tension relationship of the ankle dorsi- and plantarflexors as measured by a Biodex dynamometer (Biodex Medical Systems Inc, Shirley, NY). Methods: Twenty healthy young adult males participated in this study and were exposed to two treatments. The first treatment (nonvibration) involved passive stretching of the plantarflexors at end range of motion (ROM) for five 1-min bouts. The second treatment involved the same passive stretch with superimposed WBV (frequency = 26 Hz) for five 1-min bouts on a rotary vibration plate (Galileo 900; Novotec, Pforzheim, Germany). Voluntary ROM, peak torque, and corresponding joint angle of the plantar- and dorsiflexors were recorded pre- and posttreatment. Within-treatment (before and after) and between-treatment (WBV and nonvibration) outcomes were assessed by repeated-measures MANOVA. Results: No significant changes in the measures of ankle dorsiflexion were found within or between treatments. No significant changes in the measures of ankle plantarflexion were found after the nonvibration treatment. After WBV, however, there was a significant 7.1- shift in the angle (P = 0.001) of peak plantarflexor torque production corresponding to a longer muscle length.
Subject Human Movement and Sports Science not elsewhere classified
Keyword(s) DYNAMOMETER
ISOKINETIC
LENGTH-TENSION
TORQUE
DOI - identifier 10.1249/MSS.0b013e31817eeeb8
Copyright notice ©2008The American College of Sports Medicine
ISSN 0195-9131
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