PSI Barbering Practice Exam 2025 - Free Barbering Practice Questions and Study Guide

Muscular tissue responds to electric current, which can be classified into two main categories: high-frequency and low-frequency stimulation. Low-frequency currents are often utilized in various therapeutic and cosmetic applications to promote muscle contraction and improve circulation. This form of stimulation can assist in muscle toning and rehabilitation procedures by creating a contraction that isn't achievable through voluntary movement alone.

High-frequency stimulation tends to target deeper layers of the skin and is often used for its heating effects, whereas low-frequency stimulation primarily focuses on muscle fibers. In contrast, static currents refer to electrical charges that do not flow continuously, making them less relevant in the context of stimulating muscle contractions. Direct and indirect may refer to the modes of application of electric currents but do not specifically categorize the frequency as high or low. Thus, low-frequency is the most appropriate classification that complements high-frequency in the context of muscle stimulation.