Final answer:
The Russian AC current is used in physical therapy to treat muscle atrophy and help strengthen muscles, especially when patients cannot exercise actively.
Step-by-step explanation:
The Russian AC current is primarily intended to treat muscle atrophy and strengthen muscles. This form of electrotherapy uses a high frequency alternating current and is often employed in physical therapy and rehabilitation. It is especially useful for patients who are unable to perform active exercises due to injury, surgery, or neurological ailments.
Through the application of Russian AC current, muscles can be stimulated to contract, which can help maintain or even increase muscle tissue strength and prevent atrophy. It's an effective treatment modality for those needing neuromuscular reeducation and muscle conditioning after periods of disuse.