Final answer:
Ultrasound diathermy uses high-frequency current to produce heat and increase blood flow, often for physical therapy and pain relief. Microwave diathermy is similar but uses microwaves for deep tissue heating. Therapists must be careful to avoid tissue damage.
Step-by-step explanation:
The treatment that uses high-frequency current to produce heat and increase blood flow is known as ultrasound diathermy. This method employs intensities ranging from 10³ to 10⁴ W/m² and frequencies typically between 0.8 to 1 MHz. The thermal energy generated by this high-intensity ultrasound is beneficial for deep heating treatments in physical therapy segments, such as treating injured or overworked muscles to alleviate pain and enhance flexibility. Additionally, microwave diathermy is another form of deep heat treatment that uses microwaves to penetrate tissues, which is effective in managing muscular pains, spasms, tendonitis, and rheumatoid arthritis. Therapists must exercise caution to prevent tissue damage from overheating and cavitation, with special attention near joints and bone areas