The flow of air in and out of the alveoli is called ventilation and has two stages: inspiration (or inhalation) and expiration (or exhalation). To accomplish this, the whole thorax moves and changes size, due to the action of two sets of muscles: the intercostal muscles and the diaphragm. These are the muscles that are strengthened by using the Expand-A-Lung Breathing Resistance Exerciser. In essence, you inhale more oxygen, and you exhale more carbon dioxide. The result is a substantial improvement in shortness of breath and endurance through better breathing. All is done naturally, with the help of the Expand-A-Lung Breathing Resistance Exerciser. 5 year unlimited warranty for parts and labor.

About your Peak Flow Meter: A peak flow meter is a handheld device that measures how well air moves out of the lungs. It checks how fast air leaves the lungs when you blow forcefully and you fully inhale. Keeping track of peak expiratory flow helps you know if your respiratory symptoms are worsening or not. This meter was designed to make following your respiratory treatment plan easy. Your health care provider will se the color zone indicators to your personal zones based on your personal best peak flow rate value. (The best peak flow value you can achieve on a good day when your symptoms are under control). The AsthmaMD peak flow meter is a single patient use device to measure a patients's peak expiratory flow rate in liters/minutes. this measurement is helpful in managing respiratory conditions such as asthma. The device is intended for use by patients requiring the measurement of peak expiratory flow rates. We have provided a free downloadable tracking App for accurate monitoring of your asthma. However, if you're not able to access AsthmaMD app, we have provided a convenient paper log.