Pursed-lip inhaling Asthma
Pursed-lip breathing (PLB) generates a positive air pressure that helps keeping the airways open longer in a way that more skin tightening and escapes which may be replaced by fresh air. This process of breathing has several advantages especially to asthmatics. Many of them are the following: 

breathing


� Increases the total number of inhaled and exhaled air (vital capacity)
� It helps every one of the stale air to emerge from from lungs.
� It lengthens time that the airways remain open thereby less efforts are needed for breathing.
� It contributes to better alveolar exchange of gases thereby more oxygen can go into the bloodstream plus much more carbon dioxide can exit.
� It relaxes your body by increasing the parasympathetic nerves.
In an symptoms of asthma, less air reaches the lungs since the bronchiget inflamed and secrete excess mucus that makes the body continue to work hard to breathe.
Pursed-lip breathing makes breathing far better mainly because it reduces the effort required to breathe by raising the technique diaphragm along with the intercostal muscles rather than chest and neck muscles.
Oxygen Saturation (SO2) refers to the percentage of haemoglobin that's fully coupled with oxygen. Oxygen Saturation falls in asthmatic attacks due to airway obstruction.
PO2 (Partial Pressure of Oxygen) will be the volume of oxygen present in the bloodstream. It reflects the efficacy of lungs in getting oxygen into the blood externally. It falls in asthmatics especially in attacks.
Inhalation of air can be an active movement regarding the contraction of diaphragm and auxiliary muscles to make negative pressure which pulls air in to the lungs. Exhalation is generally a passive movement since the air flows across the pressure gradient which doesn�t require energy and therefore no muscular activity should be used. Since inhalation is active and exhalation is passive, respirationinfluences the autonomous neurological system like inhalation it has an surge in sympathetic activity while during exhalation there is an increase in parasympathetic activity. Thus pulse rate increases during inhalation as muscle sympathetic activity is suppressed and decreases during exhalationdue to muscle sympathetic activity.This is whats called respiratory sinus arrhythmia which is related to vagal tonus.
PLB induces heartrate changes similar to precisely what is observed in respiratory sinus arrhythmia. It has been linked to better efficiency in pulmonary gas exchanges, thereby producing better alveolar perfusion and ventilation.

breathing