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.
Injuries to this muscle are rare, but symptoms include pain in the chest, bruising, and decreased strength of the muscle. The pectoralis minor is located underneath the pectoralis major. This thin triangle-shaped muscle runs up and down along the upper ribs. The major muscles in the upper torso include: