Anatomy & Physiology: Current Research
Open Access

Abstract

Respiratory Muscle Physiology in Chronic Pulmonary Diseases

Ibrahim Hassan

Respiratory muscles are fundamental to the maintenance of effective ventilation and gas exchange, enabling the continuous movement of air between the external environment and the lungs. While pulmonary diseases are traditionally associated with airway obstruction, impaired lung mechanics, or parenchymal damage, growing evidence indicates that respiratory muscle dysfunction is a major contributor to symptom severity, exercise intolerance and reduced quality of life in patients with chronic pulmonary diseases. Advances in respiratory physiology have shifted attention toward understanding how respiratory muscles adapt to chronic disease and how targeted interventions may improve both functional capacity and clinical outcomes. The diaphragm is the principal muscle of inspiration, supported by the intercostal muscles, abdominal muscles and accessory muscles of respiration, including the sternocleidomastoid and scalene muscles. Under normal physiological conditions, these muscles function in a coordinated manner to generate adequate tidal ventilation while minimizing energy expenditure. Efficient respiratory muscle performance depends on intact neuromuscular control, sufficient oxygen delivery, balanced metabolic activity and optimal thoracic mechanics.

Published Date: 2025-04-02; Received Date: 2025-03-03