One benefit of ultrasound over infrared modalities is its ability to penetrate subcutaneous fat. The purpose of this study was to compare tissue temperature rise during ultrasound treatments in humans with various thicknesses of subcutaneous fat in the medial gastrocnemius. Twenty males served as subjects. A 23-gauge hypodermic needle microprobe was inserted 3-cm deep into the medial portion of the anesthetized gastrocnemius, and connected to a thermocouple temperature gauge. We applied 15 ml of ultrasound gel, preheated to body temperature (37°C), to a 10-cm-diameter target area. Continuous ultrasound was delivered topically at 1.5 W/cm2 for 10 minutes. During this time, the soundhead was moved at a speed of 4 cm per second, and the temperature was recorded every 30 seconds. The mean baseline temperature for all subjects was 35.4°C. The mean temperature increase was 4.9°C. We performed a regression analysis to test for correlation between fat thickness and tissue temperature rise of subjects. There was a small positive but insignificant correlation (r=.128). This supports the claim of Grotthus and Draper. Since subcutaneous fat does not serve as a barrier to therapeutic ultrasound, athletic trainers and physical therapists can expect comparable increases in muscle temperature when using this modality on people with varying thicknesses of adipose tissue.
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机译：超声波相对于红外线的好处之一是其穿透皮下脂肪的能力。这项研究的目的是比较在内侧腓肠肌中各种厚度的皮下脂肪的人进行超声治疗期间的组织温度升高。二十名男性为受试者。将一个23号皮下注射针头微探针插入麻醉的腓肠肌内侧3 cm深处，并连接到热电偶测温仪上。我们将预热至体温（37°C）的15 ml超声波凝胶施加到直径10厘米的目标区域。连续超声以1.5 W / cm 2 局部给药10分钟。在这段时间内，音头以每秒4厘米的速度移动，并且每30秒记录一次温度。所有受试者的平均基线温度为35.4°C。平均温度升高为4.9°C。我们进行了回归分析，以测试受试者的脂肪厚度和组织温度升高之间的相关性。有一个小的正相关但无关紧要（r = .128）。这支持了格罗特斯和德雷珀的主张。由于皮下脂肪不会成为治疗超声波的障碍，因此，在脂肪组织厚度各不相同的人身上使用这种方式时，运动训练师和物理治疗师可以预期肌肉温度会相应提高。
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