Year: 1985
Type: article
Study design: Observational Study
Abstract: Previous studies have suggested that SCUBA divers, breath-hold divers and endurance runners exhibit a low ventilatory response to hypercapnia.They also appear to have a reduced steady-state, and possibly a lower neurogenic, ventilatory response to exercise.The extent to which competitive swimmers may differ in any one of these factors is unclear.The purpose of this study was to test the hypothesis that swimmers adapt to their activity in such a way that their ventilatory response to hypercapnia and exercise is different from non-swimmers.Resting arterialized venous blood samples were taken from 16 untrained subjects, 16 endurance runners and 1 6 competitive swimmers and analyzed for pH, PCO,, PO2 and bicarbonate.VC, FEV,., and MW were determined by spirornetry.Ventilatory response to inspired CO, was determined at rest by a rebreathing method.The subjects performed the Sjostrand PWCI7, bicycle ergometer test during which 002 and OI were determined.The neurogenic ventilatory response to exercise was estimated from the increase in ventilation observed during the first 15 seconds of exercise at each workload.The steady-state ventilatory response to exercise was measured as the difference between the steady-state ventilation from one workload to the next.Both the neurogenic and steady-state ventilatory responses to exercise were normalized with respect to the change in 002 between loads.No significant differences in either acid-base status or ventilatory response to CO, were found among the groups.The swimmers had significantly greater VC and FEV,., ( P c 0 .0 5 ) than both the runners and the nonathletes.The nonathletes also had a significantly lower M W ( ~< 0 .0 5 ) than the other two groups.The estimated aerobic capacity, as determined by the PWC,,, test and the slope of exercise heart rate to VO,, differed significantly between groups.The runners had the highest aerobic capacity ( ~< 0 .0 5 ) and the nonathletes the lowest ( ~< 0 .0 5 ) .Both the LIST OF TABLES TABLE 1 .o2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 1 1 .o12.
Source: Summit (Simon Fraser University)
Author: A. M. Leevers
Language: English
Subfield: Physiology (medical)
Field: Medicine
Domain: Health Sciences
Open Access status: green
OpenAlex ID: W2310550811