A Comparison of Intramuscular Temperatures during 10-Minute 1.0-MHz Ultrasound Treatments at Different Intensities

in Journal of Sport Rehabilitation
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Context:

Research on therapeutic ultrasound has not focused on the duration needed to cause thermal change with various ultrasound intensities.

Objective:

To analyze triceps surae intramuscular temperature using 4 intensity levels after a 10-min 1-MHz continuous ultrasound treatment at a depth of 4 cm.

Design:

1 × 4 repeated measures. Independent variable: intensity of 4 levels—0.5, 1.0, 1.5, and 2.0 W/cm2. Dependent variable: peak intramuscular temperature.

Setting:

Research laboratory.

Participants:

19 volunteers with no lower leg pathologies.

Intervention:

Treatment order was balanced via Latin square and performed 24 hr apart.

Main Outcome Measures:

Peak intramuscular temperatures.

Results:

The only significant difference detected was that the mean temperature after the 1.0-W/cm2 treatment (37.3 °C) was greater than that at 2.0-W/cm2 intensity (36.1 °C). No treatment reached the desired 4° increase needed for therapeutic efficacy.

Conclusions:

Treatments at 1.0 W/cm2 increased tissue temperatures more than those at 2.0 W/cm2.

Leonard is a doctoral student at the University of Virginia, Charlottesville, VA. Merrick is with the Athletic Training Division, The Ohio State University, Columbus, OH 43210. Ingersoll is with the graduate programs in sports medicine and athletic training, University of Virginia, Charlottesville, VA 22904-4407. Cordova is with the Athletic Training Dept, Indiana State University, Terre Haute, IN 47809.