Abstract
Changes in pulmonary function tests (PFT) are often reported after a prolonged exhaustive bout of exercise. Results from previous investigations show that the direction of the change and the specific PFT variable affected will often differ. It appears as if subject selection and the modality of exercise may account for some of these disparate results. To compare PFT measures following an exhaustive bout of running and an exhaustive bout of cycling, ten runners (˙VO2 max = 67.8±4.0 ml/kg/min) ran on a treadmill at 75% of their ˙VO2 max for 1 hour. The intensity was increased by 5% of the subject's ˙VO2 max every 15 minutes thereafter until exhaustion. Ten cyclists (˙VO2 max = 65.0±2.2 ml/kg/min) completed a similar protocol while riding their bikes on an electronically braked trainer. Significance was set at 0.05 for all analyses. Time to exhaustion did not differ significantly between the runners and cyclists, 74.2±3.5 vs 71.5±5.0 min. Forced vital capacity was found to decrease significantly from 4.85±0.31 to 4.66±0.28 liters in runners; whereas, cyclists showed no significant pre to post exercise differences (p>0.05), 5.74±0.28 vs 5.71±0.27 liters. The mid expiratory flow rate was found to increase significantly from pre to post exercise in both runners, 4.21±0.40 vs. 4.55±0.55 liters/sec, and cyclists, 3.85±0.30 vs 4.32±0.41 liters/sec. Runners significantly decreased their maximal voluntary ventilation (MVV) from 167.9±10.0 to 163.7±10.5 liters/min from pre to post exercise; whereas, cyclists significantly increased MVV from 181.6±8.0 to 193.3±7.8 liters/min. Maximal inspiratory pressure was unchanged from pre to post exercise in runners 110.5±9.4 vs 110.8±8.8 cm H2O and decreased significantly from 127.3±4.0 to 120.3±5.2 cm H2O in cyclist. The forced expiratory volume in 1 second and the maximal expiratory flow rate did not differ from pre to post exercise in either the cyclist or the runners. These results suggest differences between cyclists and runners when performing pulmonary function tests following an exhaustive exercise bout.
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