Runner and author Budd Coates devised a rhythmic breathing pattern when he ran. This method allows runners to keep their breathing in sync with their footstrikes. It makes breathing more comfortable and helps avoid injury. The force of footstrikes creates the greatest amount of stress on the body. To prevent injury from repeated hits, it's possible to alternate which foot is struck by the ground upon exhalation. The dispositivo OPEP is intended to treat patients with difficulty breathing, such as patients suffering from certain respiratory or cardiac conditions, or those with anesthesia. To help improve the breathing, this device pushes air into the lungs via the cyclic (oscillations pressure) during expiration.