In many countries, PAP machines are only available by prescription. A sleep study at an accredited sleep lab is usually necessary before treatment can start. This is because the pressure settings on the PAP machine must be tailored to a patient's treatment needs.
The pectoralis major muscle also performs internal rotation -- turning your arm in toward your body. This action, also called medial rotation, is important for reaching behind your back to tuck in your shirt and combing your hair on the opposite side of your head.
The Pectoralis Major muscle is a thick, fan-shaped surface muscle located on the anterior chest of the human body. It makes up the majority of the Pectoralis muscles in the male. With women the Pectorlis Major muscle lies hidden under the breasts.