Morishita Katsuyuki, Karasuno Hiroshi, Yokoi Yuka, Morozumi Kazunori, Ogihara Hisayoshi, Ito Toshikazu, Fujiwara Takayuki, Fujimoto Tetsuya, Abe Koji
Koriyama Institute of Health Sciences, Fukushima, Japan.
Interdisciplinary Graduate School of Science and Technology, Shinshu University, Nagano, Japan.
J Jpn Phys Ther Assoc. 2014;17(1):1-7. doi: 10.1298/jjpta.Vol17_001.
This study aimed to clarify the effects of therapeutic ultrasound on intramuscular local blood circulation (and oxygen dynamics) using near-infrared spectroscopy (NIRS).
The participants were 11 healthy males.
All participants performed all three trials; (1) the ultrasound (US group), (2) without powered ultrasound (placebo group), and (3) rest (control group). Ultrasound was applied at 3 MHz, 1.0 W/cm(2), and 100% duty cycle for 10 minutes. Evaluation index were oxygenated, deoxygenated, and total hemoglobin (Hb) concentrations in the intramuscular and skin surface temperature (SST). The experimental protocol was a total of 40 minutes, that is, 10 minutes before trial (rest), 10 minutes during the trial (ultrasound, placebo, and control), and 20 minutes after trial (rest). The NIRS and SST data collected before and after the trial were divided into 5 minutes intervals for further analysis.
Oxygenated and total hemoglobin levels were significantly higher in the US group than in the placebo and control groups for the 20 minutes after ultrasound (p < 0.01). The SST was significantly higher in the US group than in the control for 15 minutes after ultrasound (p < 0.05), while it was significantly lower in the placebo group than in the US and control groups for 20 minutes after the trials (p < 0.01).
The effects of ultrasound were maintained for 20 minutes after the trial on intramuscular blood circulation and oxygen dynamics. These effects were caused by a combination of thermal and mechanical effects of the ultrasound.
本研究旨在使用近红外光谱法（NIRS）阐明治疗性超声对肌肉内局部血液循环（及氧动力学）的影响。
11名健康男性。
所有参与者均进行了全部三项试验；（1）超声组（US组），（2）无动力超声组（安慰剂组），以及（3）休息组（对照组）。以3兆赫、1.0瓦/平方厘米及100%的占空比施加超声10分钟。评估指标为肌肉内氧合血红蛋白、脱氧血红蛋白及总血红蛋白（Hb）浓度以及皮肤表面温度（SST）。实验方案共40分钟，即试验前10分钟（休息）、试验期间10分钟（超声、安慰剂及对照）以及试验后20分钟（休息）。将试验前后收集的NIRS和SST数据按5分钟间隔划分以进行进一步分析。
超声后20分钟内，US组的氧合血红蛋白和总血红蛋白水平显著高于安慰剂组和对照组（p < 0.01）。超声后15分钟内，US组的SST显著高于对照组（p < 0.05），而试验后20分钟内，安慰剂组的SST显著低于US组和对照组（p < 0.01）。
试验后，超声对肌肉内血液循环和氧动力学的影响持续了20分钟。这些影响是由超声的热效应和机械效应共同导致的。
