Could the Difference in Respiratory Muscle Power Explain Gender Variation in Lung Function?

Few studies have been done to explain gender difference in lung function and none was conclusive. This study questions whether there is a gender difference in respiratory muscle power and its correlation with the lung function values. The study included two groups of University students 25 males and 25 females matched for age, height and weight. They were of the same ethnic class, socioeconomic status and perfect health. Height and weight were measured using standard scales. Lung Function Tests (FVC, FEV1 & PEF) were performed using a digital spirometer and maximum inspiratory and expiratory pressures (MIP &MEP) as indicators for respiratory muscle power were measured using a digital Respiratory Pressure Meter. Data were analyzed using SPSS software and independent ttest was used to compare the mean difference in results. The mean FVC (L), FEV1 (L) and PEF (L/min) were significantly higher in the males group (p<0.001). Similarly, mean MEP and MIP (cm/H2O) were significantly higher in the males group with a significant positive correlation between respiratory muscle power indicators (MEP or MIP) and lung function parameters (FEV1, FVC and PEF in both sexes (p < 0.001, r = 0.74). The study concluded that gender variation in lung function is likely explained by gender difference in the power of the respiratory muscles KeywordsGender and lung function; Respiratory muscle power; Pulmonary function test