Relative endurance and physiological responses: A study of individual differences in prepubescent boys and adult men

Stanley P. Sady, Victor L. Katch

Research output: Contribution to journalArticle

1 Scopus citations


The reliability of individual differences in relative endurance performance and physiological response was studied in prepubescent boys (N = 21) and adult men (N = 21). Subjects were tested twice (test and retest) on a relative endurance test consisting of pedalling a bicycle ergometer for 8 minutes duration at a high initial work-rate. The work-rate averaged 103% ± 1.0% VO2max (mean ± S.E.) for the children and 105% ± 1.1% VO2 max for the adults, p >.05. Except for minute 3, children and adults had similar patterns for consistency of relative endurance performance (RPM). However, in comparison to adults, children had smaller individual difference variation for both VO2 and HR (p >.05). On the average, children had a greater proportion of total variability in VO2 (34% vs. 17%) and HR (49% vs. 13%) due to intra-individual variability in comparison to true individual differences. Children-adult differences were attributed to maturity differences.

Original languageEnglish (US)
Pages (from-to)246-255
Number of pages10
JournalResearch Quarterly for Exercise and Sport
Issue number2
StatePublished - 1981
Externally publishedYes



  • Adults
  • Bicycle ergometer
  • Children
  • Endurance
  • Exercise
  • Heart rate
  • Oxygen uptake
  • Physiology
  • Reliability

ASJC Scopus subject areas

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

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