Transient oxygen uptake and heart rate responses at the onset of relative endurance exercise in prepubertal boys and adult men

S. P. Sady

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Performance and physiologic responses to relative endurance exercise were compared in 21 prepubescent boys (C, mean ± SD, age = 10.2 ± 0.28 yrs) and 21 adult men (A, age = 30.0 ± 1.23 yrs). Relative endurance exercise consisted of pedaling a bicycle ergometer for 8 min at an initial power output of 103 ± 1.0% V̇O2 max (mean ±SE) for the C and 105 ± 1.1% V̇O2 max for the A (P > 0.05). Standard open circuit spirometric techniques were used to measure V̇O2, and HR was monitored via a bipolar ECG. The physiologic (V̇O2 or HR) responses were graphed and a one-component exponential equation fit to the data. Few differences (P > 0.05) were evident in power output characteristics (RPM or total % dropoff) between C and A. However, many C-A differences were evident in physiologic responses. C have a faster V̇O2 half-time (t 1/2 ) than that of As (C 17.2 ± 0.74 s vs A 28.5 ± 1.31 s, P < 0.05). Also, the HR t 1/2 values (C 24.8 ± 1.96 s vs A 41.0 ± 2.94 s, P < 0.05) indicate that C reached their asymptotic HR more quickly than A. Apparently, young C have quicker V̇O2 and HR responses to relative endurance exercise. Whether a threshold age exists where the Cs responses 'mature' remains the subject of subsequent investigations.

Original languageEnglish (US)
Pages (from-to)240-244
Number of pages5
JournalInternational Journal of Sports Medicine
Volume2
Issue number4
StatePublished - 1981
Externally publishedYes

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Public Health, Environmental and Occupational Health
  • Physical Therapy, Sports Therapy and Rehabilitation

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