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Sinusoidal current is a type of alternating current that is particularly effective in therapeutic settings. Its primary application is in muscle contraction therapy, where it helps stimulate muscle tissue. The alternating nature of the sinusoidal current leads to rhythmic contractions, which can improve muscle tone and promote circulation in the treated area. This makes it beneficial for rehabilitation, reducing muscle atrophy, and enhancing overall muscle function.

The other options involve different mechanisms or therapies that do not directly relate to the specific action of sinusoidal current. Improving skin hydration relates more to hydrating agents or specific facial treatments rather than electrical stimulation. Enhancing oxygen delivery to cells concerns blood flow and respiratory processes, often addressed through cardiovascular exercise rather than electrical modalities. Similarly, the treatment of hormonal imbalances typically involves medical or lifestyle interventions, not electrical stimulation. Thus, the application of sinusoidal current aligns clearly with muscle contraction therapy.