Ultrasound heating is curvilinear in nature and varies between transducers from the same manufacturer.
BACKGROUND
Ultrasound heating rates are known to differ between various manufacturers; it is unknown whether this difference exists within a manufacturer.


OBJECTIVE
Determine if intramuscular heating differences exist between transducers from the same manufacturer.


METHODS
3 x 10 repeated measures. Independent variables were Transducer (A, B, and C) and Time (10-min time points during the treatment).


METHODS
Controlled laboratory.


METHODS
Twelve volunteers (M = 4, F = 8; age: 23 +/- 4 years; calf-girth: 37.94 +/- 4.16 cm; calf-skinfold: 27 +/- 17 mm).


METHODS
Three 10-min 1MHz continuous ultrasound treatments performed at an intensity of 1.2 W/cm2, over an area 2x transducer.


METHODS
Calf temperature increase.


RESULTS
Heating curve generated for each transducer were significantly different (P = .034) but the overall temperature increases following 10 minutes of treatment were within 0.1 degree C (F = 1.023 P = .573).


CONCLUSIONS
Heating curves differ between transducers from the same manufacturer but peak heating at 10 minutes was similar.
Demchak
Timothy J
TJ
Athletic Training Department, Indiana State University, Terre Haute, IN, USA. athdemch@isugw.indstate.edu
Straub
Stephen J
SJ
Johns
Lennart D
LD
D000328:Adult; D001831:Body Temperature; D004311:Double-Blind Method; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D014159:Transducers; D014464:Ultrasonic Therapy / Q000295:instrumentation*