VACCARO, PAUL and DAVID H. CLARKE. Cardiorespiratory alterations in 9 to 11 year old children following a season of competitive swimming. Med. Sci. Sports. Vol. 10, No. 3, pp. 204-207, 1978.—The purpose of this study was to describe cardiorespiratory alterations in a group of previously untrained 9-to-11 year old children resulting from seven months of swimming training. Fifteen members of a competitive swim team served as subjects. A non-training group of fifteen children of similar age, height and weight were studied at the same times. All measurements were made on three separate days both before and after the training period. On Measurement Day One the subjects were measured for VC, FEV1.0, and MVV. On Measurement Day Two they were measured for PWC170 and on Measurement Day Three height (cm), weight (kg), V̇E max (l/min), V̇o2 max (ml/kg•min) and HR max were determined. Results of the analyses indicated that: (1) the mean PWC170 change in the trained children (+ 80.00 kgm/min) was significantly greater than that in the reference group (+ 30.00 kgm/min) (P<.05); (2) the mean V̇o2 max change in the experimental group (+8.11 ml/kg•min) was significantly greater than in the reference group (2.21 ml/kg•min) (P<.01); and the mean changes in VC, FEV1.0, MVV, V̇E max, and HR max were not greater than one would expect to see in normal children of similar age and body dimensions (P>.05).
VITAL CAPACITY, FORCED EXPIRED VOLUME, MAXIMUM VENTILATORY VOLUME, PHYSICAL WORKING CAPACITY, MAXIMUM EXPIRED VOLUME, MAXIMUM OXYGEN UPTAKE, MAXIMUM HEART RATE