Pulmonary function of marathon runners

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Abstract
Marathon runners (N = 11) who had just competed in the 26 mile marathon race at the Florida Relays underwent measurement of the following respiratory variables: forced vital capacity (FVC), one second forced expiratory volume (FEV1.0), FEV1.0/FVC ratio, total lung capacity (TLC), functional residual capacity (FRC), FRC/TLC ratio, residual volume (RV), RV/TLC ratio, diffusing capacity of the lungs for carbon monoxide (DCO) by the breath holding technique including the alveolar volume ( VA), alveolar-capillary permeability (k‘CO), alveolar-capillary membrane diffusing capacity (DM), and the pulmonary capillary blood volume (Vc). Records of their months of training, miles run per week and place of finish in the race were acquired. The predicted score in the above 13 respiratory variables based on age, height and sex was determined for each runner. Comparisons between mean predicted and mean observed scores for the respiratory variables were made using multiple t-tests for related measures. Relationships between the 13 respiratory variables and months of training, miles run per week and place of finish in the race were determined by using the Kendall Rank Correlation Coefficient (tau). The mean differences between the predicted and observed scores for Dco and Vc were significant at the .005 level of significance. Significant statistical relationships were found between the place in the marathon race and FRC, RV, RV/TLC ratio, and Dco. The place in the marathon race was also significantly related to the number of months of training.

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