Spirometry will be carried out according to American Thoracic Society standards. Both absolute and percent-predicted spirometric values will be recorded. Predicted values will be calculated from validated, published, race-specific regression equations. (Hankinson, et al. Spirometric reference values values from a sample of the general US population. Am J Respir Crit Care Med 1999; 159:179-187.) Asian-American athletes will be evaluated using norms for whites.