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Children adult comparisons of oxygen uptake and heart rate kinetics during submaximum exercise

, : Children adult comparisons of oxygen uptake and heart rate kinetics during submaximum exercise. Research Quarterly for Exercise & Sport 54(1): 55-59

O2 (.ovrhdot.VO2) and heart rate (HR) kinetics for submaximum exercise were compared in prepubescent boys (mean age .+-. SD = 10.2 .+-. 1.28 yr, n = 21) and adult men (30.0 .+-. 5.64 yr, n = 21). Standard open circuit spirometric techniques were used to determine .ovrhdot.VO2 and a bipolar ECG was used to measure HR. The kinetics of .ovrhdot.VO2 and HR were determined for each subject using graphic procedures. Subjects performed submaximum exercise on the bicycle ergometer at an intensity of 42 .+-. 1.3% (mean .+-. SE) of .ovrhdot.VO2 max for the children and 39 .+-. 0.7% of .ovrhdot.VO2 max for the adults (P = 0.07). There were no group differences in .ovrhdot.VO2 t1/2 [half-time] (children t1/2 = 18.5 .+-. 0.75 and adults t1/2 = 17.4 .+-. 0.39 s, P = 0.18) and HR t1/2 (children t1/2 = 11.4 .+-. 1.86 s and adults t1/2 = 13.6 .+-. 1.66 s, P = 0.38). Children and adults do not differ in cardiorespiratory adjustments during low intensity exercise. This is in contrast to previous suggestions that children have a faster cardiovascular adjustment to exercise.


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