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Effect of coupling medium temperature on rate of intra-muscular temperature rise using continuous ultrasound

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
David H. Perrin, Provost and Executive Vice Chancellor (Creator)
Sandra J. Shultz, Associate Professor (Creator)
Institution
The University of North Carolina at Greensboro (UNCG )
Web Site: http://library.uncg.edu/

Abstract: Objective: We determined the effects of coupling medium temperature on the rate of intramuscular temperature rise (RTR) during continuous ultrasound. Design and Setting: Ultrasound was applied in a continuous mode at a frequency of 1 MHz and intensity of 1.5 W/cm^sup 2^. Each subject received 3 treatments, using water-based coupling gel at temperatures of 18 deg C, 25 deg C, and 39 deg C. All treatments were performed in an athletic training room under controlled environmental conditions. Subjects: Eighteen healthy male subjects (mean age = 23.6 +/- 3.5 years; height = 177.8 +/- 6.9 cm; weight = 76.6 +/- 8.2 kg; calf size = 37.6 +/- 2.4 cm) participated in this study. Measurements: A thermistor was inserted into the left medial triceps surae at a depth of 5 cm, and baseline tissue temperatures were recorded before treatment. Intramuscular temperature was recorded every 30 seconds until the temperature rose 4 deg C above baseline or until discomfort was felt. RTR was calculated by dividing the absolute temperature change by treatment time. Results: A 1-way, repeated-measures analysis of variance revealed a significant difference in RTR among gel temperatures. RTR was significantly faster using the 25 deg C gel compared with the 18 deg C and 39 deg C gels. There was no difference between the 18 deg C and 39 deg C gel treatments. Conclusions: These results suggest that the use of a cooled or heated gel may be counterproductive when maximal thermal effects are desired within a given time frame.

Additional Information

Publication
Journal of Athletic Training, 35:417-421
Language: English
Date: 2000
Keywords
Modalities, Thermal, Water-based gel