Effects of Altering Intensity during 1-MHz Ultrasound Treatment on Increasing Triceps Surae Temperature
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Context:
It has been suggested that to obtain optimal physiological effects of heating, musculoskeletal temperature (TEMP) should be elevated 3 °C above baseline and maintained for at least 5 min.
Objective:
To identify a multi-intensity ultrasound protocol that will achieve optimal heating.
Design:
1 × 2 between-subjects.
Setting:
Sports-injury research laboratory.
Participants:
20 healthy volunteers.
Interventions:
A 2.5-min treatment at 2.4 W/cm2 immediately followed by a 7.5-min treatment at 1.0 W/cm2 (T1) and a 10-min treatment at 1.5 W/cm2 (T2).
Outcome Measures:
TEMP change during the first 2.5 min of ultrasound treatment (°C), time the TEMP was ≥3 °C above baseline during and after the treatment.
Results:
T1 increased TEMP during the first 2.5 min of the ultrasound treatment (3.22 ± 1.25 °C) more than T2 did (1.68 ± 0.72 °C). No difference was found for the remaining measures.
Conclusions:
The multi-intensity protocol (2.4 W/cm2 and 1.0 W/cm2) did not result in optimal heating.
Burr, Demchak, Cordova, and Stone are with the Athletic Training Dept, Indiana State University, Terre Haute, IN 47809. Ingersoll is with the Dept of Human Services, University of Virginia, Charlottesville, VA 22904.
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