Which category includes light therapy modalities?

• A. Electrical Modalities
• B. Light Therapy Modalities
• C. Thermal Modalities
• D. Mechanical Modalities

Answer: (B)

Light energy is used to influence tissue and cellular activity, so light therapy modalities form their own group within physical agent modalities. This category is defined by delivering photons to the body, which can promote healing, reduce inflammation, and relieve pain by signaling cellular processes. They are distinct from electrical modalities, which use electrical currents to stimulate nerves or muscles; thermal modalities, which transfer heat or cold; and mechanical modalities, which apply physical forces or movement. Examples include lasers, LEDs, infrared, and ultraviolet therapies. Therefore, the category that includes light therapy modalities is the light therapy modalities group, because it specifically groups together treatments that rely on light energy to achieve therapeutic effects.