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.
Activities that cause pain and symptoms of the pectoralis major muscle: Lifting heavy objects. Working with your arms out in front of you (computer) Driving and horseback riding: both require you to hold your arms up and in front of your body. Keeping your shoulders rolled forward or pulled up.