James L Karnes1, Harold W Burton. 1. Department of Physical Therapy, D'Youville College, Buffalo, NY 14201-1084, USA. karnesj@dyc.edu
Abstract
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
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
Authors: J Saturnino-Oliveira; M A Tomaz; T F Fonseca; G A Gaban; M Monteiro-Machado; M A Strauch; B L Cons; S Calil-Elias; A M B Martinez; P A Melo Journal: Braz J Med Biol Res Date: 2012-03-15 Impact factor: 2.590
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