Breadcrumb Home Physical Therapist Assistant (PTHA) PTHA 1531 PTHA 1531: Physical Agents Download as PDF Class Program Physical Therapist Assistant (PTHA) Credits 5 Lecture Hours 3 Lab Hours 6 Clinical Hours 0 CIP 51.0806 Biophysical principles, physiological effects, efficacy, and application of physical agents. Forty-eight lecture hours and ninety-six lab hours per semester. Prerequisites PTHA 1301, PTHA 1405, PTHA 1413, PTHA 2301.