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.
Pushups engage the pectoralis major, pectoralis minor and the serratus anterior muscles on each side of the chest, explains the American Council on Exercise. The pectoralis major attaches to the collar bone, breastbone and rib cage and runs to the humerus, the bone of the upper arm.