Who engaged in practice.

For the purpose of this chapter the following classes of persons shall be deemed to be engaged in the practice of physical therapy: 1. Persons who treat human ailments by physical therapy as defined in this chapter . 2. Persons who publicly profess to be physical therapists or who publicly profess to perform the functions incident to the practice of physical therapy. [C66, 71, 73, 75, 77, 79, 81, §148A.2 ]