Abstract
855 The purpose of this study was to determine the influence of speed and skinfold fat on the achievement of a steady-state aerobic running performance(SSR) in children. Subjects were 51 boys and 42 girls ages 9- 12 years. Each subject performed a submaximal treadmill test, running at randomly selected speeds of 4.2 to 7.5 mph. A SSR was determined by a stable heart rate(±5 beats), as well as VO2 and VCO2 values (±10%). Logistic regression analysis revealed that speed is inversely related to a SSR(χ21,93=11.5, p<.05). At 5 mph the probability of a SSR was 71%, while at 6 mph that probability was only 49%. Skinfold fat (sum of triceps and medial calf) was also shown to be inversely related to the achievement of a SSR across running speeds (χ21,93=16.4, p<.05). Running at 5 mph, the probability of a SSR was 81% for children with 25mm of skinfold fat, but only 62% for children with 35mm of skinfold fat. A SSR was also more likely in boys than girls(χ21,93=10.6, p<.05). Running at 5 mph, and with 25mm of skinfold fat, the probability of SSR was 93% for boys, but only 67% for girls. These data suggest that slower running and jogging speeds increase the likelihood of a SS performance in children, and may enhance participation in aerobic exercise. Gender and skinfold fat should also be considered in choosing a running speed for children in a personal fitness program.
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