Children-Adult Comparisons of VO2And HR Kinetics During Submaximum Exercise

Stanley P. Sady, Victor L. Katch, John F. Villanacci, Thomas B. Gilliam

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Oxygen uptake (VO2) and heart rate (HR) kinetics for submaximum exercise were compared in prepubescent boys (mean age ±SD = 10.2 ± 1.28 years, N = 21) and adult men (30.0 ± 5.64 years, N = 21). Standard open circuit spirometric techniques were used to determine VO2 and a bipolar ECG was used to measure HR. The kinetics of 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 VO2 max for the children and 39 ± 0.7% of VO2 max for the adults (p =.07). There were no group differences in VO2 t½ (children t½ = 18.5 ± 0.75 sees and adults t½ = 17.4 ± 0.39 sees, p =.18) and HR t½ (children t½ = 11.4 ± 1.86 sees and adults t½ = 13.6 ± 1.66 secs, p =.38). These data suggest that children and adults do not differ in cardiorespiratory adjustments during low intensity exercise. This is in contrast to suggestions of other investigators that children have a faster cardiovascular adjustment to exercise.

Original languageEnglish (US)
Pages (from-to)55-59
Number of pages5
JournalResearch Quarterly for Exercise and Sport
Issue number1
StatePublished - 1983
Externally publishedYes


  • Adults
  • Children
  • Heart rate
  • Kinetics
  • Oxygen uptake

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Nephrology
  • Psychology(all)
  • Applied Psychology


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