Different thermic efficacy of high-frequency therapy fundamentals for differentiated use

Author(s): Grabs, U., Conradi, E.

Journal/Book: Physikalische Medizin Rehabilitationsmedizin Kurortmedizin. 1993; 3/3: 83-86.

Abstract: Objective: Short-wave, decimeter-wave and microwave are high-frequency thermotherapeutic means used in clinical practice in manifold ways. Fundamental knowledge of energy transformation in the tissue is the prerequisite for a differentiated use.Subject: It has been the objective of the study to determine absolute temperatures in different depths of the tissue under the influence of high-frequency currents.Design: Investigations dealing with the course and profile of temperatures have been carried out with different high-frequency therapy methods. Three intensity ranges relevant to practice (low - medium - high) were chosen. The absolute temperatures in the tissue were measured in different tissue depths using a thermo-Shell element made of a chromenickel alloy. The fat leg of the domestic pig (dead tissue) was used as examination material.Results: In dependence an the tissue structure and the method used, the warming is quite different. As far as short-wave (coil field) is concerned, a good warming of the depth could be determined for the high intensity range. The decimeter-wave leads to an even distribution of the temperature. The absolute increase in temperature, however, is very small, even in the high intensity range. The microwave treatment results in a high warming of the skin as well as the fatty layer.Conclusions: The intensity range low - medium - high are clearly different in their thermic efficacy. A good warming of the depth is attained with a relatively high intensity of 90 watts short-wave. This means, however, that the thermical load limit of the skin has been reached.

Keyword(s): Hochfrequenztherapie

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