Source of Support: None, Conflict of Interest: None
Maximal mouth pressure may be used to evaluate respiratory muscle strength and follow the progress in patients with neuromuscular disorders, dyspnoea and respiratory failure. For any meaningful interpretation of these values, one needs to know the previous normal values of the person. An alternative method is to compare the values with those predicted for the particular individual based on physical parameters. Two hundred clinically healthy medical students between 18-25 years (100 males and 100 females) without any respiratory, neuromuscular, cardiac and endocrinal disorders were included. Maximal expiratory pressure at total lung capacity and maximal inspiratory pressure at residual volume were measured using Pmax Morgan mouth pressure monitor. Predictive equation have been drawn based on coefficients of chest expansion, weight and body surface area. There was a significant relationship between chest expansion and weight. The inspiratory and expiratory pressures recorded in males and females were lower when compared to Western literature.