Summary
Highlights
The video introduces the fundamental shortwave techniques, categorized into condenser, induction, and radiation fields. These concepts have been previously covered, and this session will delve into specific details that might have been overlooked.
The condenser field utilizes two metallic plates. When these plates are facing each other, they cause ionic charges in a solution to move back and forth, generating an electromotive force within the tissue that results in heat. This process is analogous to a capacitor, an electrical component that stores and releases electrical energy.
In the human body, electrodes act as the plates, and the tissue functions as the dielectric insulator. Alternating current causes energy to accumulate and transform into heat. This movement of ionic charges generates heat through conduction.
Bipolar molecules rotate their poles in response to the alternating current, facilitating polarization and causing tissue heating. For atoms, a distortion occurs where the nucleus is attracted to the negative plate and electrons to the positive plate, leading to minimal heat conversion depending on the structure's ability to distort.
The induction field involves placing circular coils around the body. Running current through these coils generates a magnetic field, which in turn creates a parallel electric field. This causes molecules or ions to move around the electric field, generating heat. If two coils are used, ions move perpendicularly to the field's direction.
The radiation field works by emitting electromagnetic waves that the organism absorbs. This absorption creates electromagnetic turbulence, affecting ions in organic solutions and generating heat.
Shortwave devices typically include a potentiometer for intensity control, a timer for duration, and a tuning mechanism to match the circuit frequencies. There's also a switch to select between continuous and pulsed current modalities. The key operational variables are modality, power, time, and tuning.