Effects of 1 MHz Therapeutic Ultrasound on Limb Blood Flow and Microvascular Reactivity: A Randomized Pilot Trial

Megan Waters, Branko Miljkovic, Jozelyn Rascon, Manuel Gomez and Alvaro N. Gurovich
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Megan Waters: Doctor of Physical Therapy Program, College of Health Sciences, The University of Texas at El Paso, El Paso, TX 79968, USA
Branko Miljkovic: Doctor of Physical Therapy Program, College of Health Sciences, The University of Texas at El Paso, El Paso, TX 79968, USA
Jozelyn Rascon: Doctor of Physical Therapy Program, College of Health Sciences, The University of Texas at El Paso, El Paso, TX 79968, USA
Manuel Gomez: Clinical Applied Physiology Laboratory, College of Health Sciences, The University of Texas at El Paso, El Paso, TX 79902, USA
Alvaro N. Gurovich: Doctor of Physical Therapy Program, College of Health Sciences, The University of Texas at El Paso, El Paso, TX 79968, USA

IJERPH, 2021, vol. 18, issue 21, 1-9

Abstract: A randomized, double-blind, placebo-controlled, cross-over study where continuous therapeutic ultrasound (CUS; at 0.4 W/cm 2 ), pulsed therapeutic ultrasound (PUS; at 20% duty cycle, 0.08 W/cm 2 ), both at 1 MHz, and placebo (equipment on, no energy provided) were randomized and applied over the forearm of the non-dominant arm for 5 min in 10 young, healthy individuals. Absolute and peak forearm blood flow (FBF) were measured via Venous Occlusion Plethysmography. FBF was measured before, halfway, and after (immediately and 5 min after) the therapeutic ultrasound (TUS) intervention. Post-ischemic peak FBF was measured 10 min before and 10 min after the TUS intervention. A two-way repeated measures ANOVA (group × time) was selected to assess differences in FBF before, during, and after TUS treatment, and for peak FBF before and after TUS treatment. FBF increased 5 min after TUS in CUS compared to placebo (2.96 ± 1.04 vs. 2.09 ± 0.63 mL/min/100 mL of tissue, p < 0.05). PUS resulted in the greatest increase in Peak FBF at 10 min after US (? = 3.96 ± 2.02 mL/min/100 mL of tissue, p = 0.06). CUS at 1 MHz was an effective treatment modality for increasing FBF up to 5 min after intervention, but PUS resulted in the greatest increase in peak FBF at 10 min after intervention.

Keywords: therapeutic ultrasound; blood flow; microvascular function (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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