A 20% reduction in oxygen blood levels may be caused by the aging process and normal breathing habits. Poor breathing robs energy and negatively affects mental alertness. Unless breathing is exercised, aging affects the respiratory system as follows:
Stiffness: The rib cage and surrounding muscles get stiff causing inhalation to become more difficult. Less elasticity and weak muscles leave stale air in the tissues of the lungs and prevents fresh oxygen from reaching the blood stream.
Rapid, Shallow Breathing: This type of breathing, often caused by poor posture and weak or stiff muscles, leads to poor oxygen supply, respiratory disease, sluggishness, or heart disease.