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Effect of Pulsed Short Wave Diathermy on Skeletal Muscle Injury in Rabbits

Dr. Brown is Instructor, Program in Physical Therapy, PO Box 8083, School of Medicine, Washington University, 660 S Euclid Ave, St. Louis, MO 63110 (USA).
Mr. Baker currently is in private practice at Professional Physical Therapy Inc, St. Louis, MO 63141. He was a student in the master's degree program in physical therapy, Washington University, when this study was conducted.

The purpose of this study was to determine whether short wave diathermy (SWD) would enhance healing of a skeletal muscle injury. Thirty-two rabbits were divided into the following four groups: 1) Experimental Group 1 (n = 8), which was given SWD twice daily for 8 consecutive days; 2) Control Group 1 (n = 8), which was followed for 8 days but not given treatment; 3) Experimental Group 2 (n = 8), which was given SWD twice daily for 16 consecutive days; and 4) Control Group 2 (n = 8), which was followed for 16 days but not given treatment. The muscle injury was induced by giving all 32 rabbits three local injections of a myotoxic drug into the right gastrocnemius muscle. After the 8 or 16 days, all muscles were removed, then embedded in paraffin or frozen, sectioned, stained with adenosine triphosphatase or hematoxylin and eosin and examined with a light microscope. No statistically significant differences in the degree of muscle healing were found between the animals in Experimental Group 1 and Control Group 1 and those in Experimental Group 2 and Control Group 2. A trend toward faster resolution of the muscle injury was observed among those rabbits in Experimental Group 2 as compared with those rabbits in Control Group 2. Further study is required to determine whether SWD can be more effective for enhancing recovery from skeletal muscle injury.

Key Words: Diathermy • Muscles • Wounds and injuries

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