New Jersey State Board Esthetics Practice Exam

What is sinusoidal current primarily used for in esthetics?

1. Skin hydration

2. Muscle contractions

3. Blood circulation

4. Hair growth stimulation

The correct answer is: Muscle contractions

Sinusoidal current is primarily used in esthetics for muscle contractions because it is a type of alternating current that creates a rhythmic, wave-like motion. This form of electrical stimulation is beneficial for toning and strengthening muscles, increasing circulation to the treated areas, and enhancing overall skin texture. The unique waveform of sinusoidal current allows it to penetrate deeper into the muscle tissue, leading to effective muscle contractions, which can be particularly useful in facial treatments aimed at lifting and rejuvenating the skin. While other options may have some association with various esthetic treatments—such as skin hydration, blood circulation enhancement, or hair growth stimulation—sinusoidal current is specifically designed to induce these involuntary muscle contractions through its specific waveforms. Thus, its primary application and effectiveness are most closely aligned with muscular activity, making it a valuable tool in the esthetician's toolkit for achieving desired cosmetic outcomes.