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Continuous therapeutic ultrasound accelerates repair of contraction-induced skeletal muscle damage in rats

KARNES JL; BURTON HW
ARCH PHYS MED REHABIL , 2002, vol. 83, n° 1, p. 1-4
Doc n°: 103979
Localisation : Documentation IRR
Descripteurs : AB1 - ETUDES GENERALES - MUSCLES
Article consultable sur : http://www.archives-pmr.org

OBJECTIVE: To examine the effect of ultrasonography on the repair of muscle injured through repeated eccentric contractions. DESIGN: Randomized, case-control study. SETTING: Laboratory animal facility. ANIMALS: Thirty-three Sprague-Dawley rats. INTERVENTIONS: Specimens were anesthetized and each foot strapped, in turn, onto a motorized foot pedal, which moved the ankle repeatedly through a range of 110 degrees. Extensor digitorum longus muscles were injured by stimulating the peroneal nerve during foot plantarflexion. Continuous 1.0MHz ultrasound treatments at 0.5W/cm(2) were applied through water submersion technique to 1 limb daily for 3, 5, or 7 days postinjury. The contralateral limb served as an injured control. MAIN OUTCOME MEASURES: Extensor digitorum longus maximum isometric tetanic force (P(o)) was measured in vitro from all extensor digitorum longus muscles and used as a functional index of muscle injury. RESULTS: Analysis of variance and Tukey post hoc analysis showed no significant differences in P(o) between treated and untreated limbs at 3 and 5 days, but at 7 days postinjury, P(o) of ultrasound-treated muscle was significantly higher than was untreated muscle. CONCLUSION: Seven days of continuous therapeutic ultrasound improved force production after contraction-induced muscle injury. Copyright 2002 by the American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation

Langue : ANGLAIS

Identifiant basis : 2002219954

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