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 and minor are the primary muscles in the chest region. Perform bench presses and decline bench presses to develop muscle mass and strength in your pectoralis major. Focus on your pectoralis minor muscles by doing weighted chest dips. Perform three sets of 10 repetitions for each exercise to develop muscle strength and size in your chest area.