Effect of continuous-wave ultrasound on blood flow in skeletal muscle.
OBJECTIVE
The purpose of this study was to determine the effect of ultrasound on forearm, skin, and muscle blood flow.


METHODS
Twenty volunteers without known vascular problems (10 male, 10 female) participated.


METHODS
All subjects received a treatment of continuous-wave ultrasound to the anterior forearm at a dosage of 1.5 W/cm2 for a duration of 5 minutes. The contralateral forearm served as the control and received identical treatment, except the ultrasound output remained at zero. Forearm blood flow was measured using venous occlusion plethysmography, and skin blood flow was measured using cutaneous laser-Doppler flowmetry before and after ultrasound administration, with the difference being muscle blood flow.


RESULTS
No differences between the control arm and the ultrasound-treated arm were found for muscle, skin, and forearm blood flow.


CONCLUSIONS
These results suggest that administration of continuous-wave ultrasound at the prescribed dosage had no effect on skeletal muscle blood flow for up to 30 minutes posttreatment. Thus, muscle hyperemia is probably not the primary mechanism responsible for the clinical benefits seen following the use of ultrasound as a therapeutic modality.
Physical Therapy Department, Naval Hospital, San Diego, CA 92134.
S E
SE
Robinson
M J
MJ
Buono
D000328:Adult; D001783:Blood Flow Velocity / Q000502:physiology; D005260:Female; D005542:Forearm / Q000098:blood supply / Q000000981:diagnostic imaging; D006801:Humans; D017078:Laser-Doppler Flowmetry; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000098:blood supply* / Q000000981:diagnostic imaging*; D010992:Plethysmography, Impedance; D012016:Reference Values; D012867:Skin / Q000098:blood supply / Q000000981:diagnostic imaging; D013997:Time Factors; D014464:Ultrasonic Therapy / Q000379:methods; D014463:Ultrasonography