The Effects of Superficial Heating before 1-MHz Ultrasound on Tissue Temperature

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William R. Holcomb
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Chris Blank
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Context:

Ultrasound significantly raises tissue temperature, but the time of temperature elevation is short.

Objective:

To assess the effectiveness of superficial preheating on temperature elevation and decline when using ultrasound.

Design:

Within-subjects design to test the independent variable, treatment condition; repeated-measures ANOVAs to analyze the dependent variables, temperature elevation and decline.

Setting:

Athletic training laboratory.

Intervention:

Temperature at a depth of 3.75 cm was measured during ultrasound after superficial heating and with ultrasound alone.

Subjects:

10 healthy men.

Main Outcome Measure:

Temperature was recorded every 30 s during 15 min of ultrasound and for 15 min afterward.

Results:

Temperature elevation with ultrasound was significantly greater with preheating (4.0 ± 0.21 °C) than with ultrasound alone (3.0 ± 0.22 °C). Temperature decline was not significantly different between preheating and ultrasound alone.

Conclusions:

Superficial preheating significantly increases temperature elevation but has no effect on temperature decline during a 15-min cooling period.

Holcomb is with the Dept of Kinesiology, University of Nevada, Las Vegas, Las Vegas, NV 89154-3034. Blank is with Lakewood Ranch High School, Bradenton, FL.

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