Ultrasound Does Not Promote Healing in Injured Muscle

Ultrasound Does Not Promote Healing in Injured Muscle
Following an injury, the healing process involves degeneration (tissue breakdown and inflammation) followed by regeneration (tissue repair and remodeling). Tissue repair involves activation of the anabolic hormone IGF-1, which promotes satellite cell formation and muscle hypertrophy. Therapists and athletic trainers often use ultrasound to promote healing in injured muscle. A University of South Carolina study found that ultrasound had no effect on IGF-1 gene expression in injured muscle, but increased it in healthy muscle. Researchers induced muscle damage to one leg through high-rep negatives (eccentric exercise) and used the other leg as a control. Using ultrasound in healthy muscle might promote muscle hypertrophy but it had no effect in promoting healing in injured muscle. (American Journal Sports Medicine, published online)

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