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.
Letâs see what the chest muscle architecture tells about how many exercises you need for your chest. Pectoralis Major & Minor: Pectoral major is the largest and the major muscle of the pectoral group, and hence the common name pecs for the chest. Pectoralis minor runs under the pectoralis major and is hidden.