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Related Experiment Videos

Ventilatory threshold: measurement and variation with age.

J D Posner1, K M Gorman, H S Klein

  • 1Philadelphia Geriatric Center, Medical College of Pennsylvania, Philadelphia 19141.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 1, 1987
PubMed
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Ventilatory threshold (VeT) and maximal oxygen uptake (VO2max) decline with age, but VeT decreases less rapidly. This study measured these key exercise parameters in older adults, finding good reproducibility and correlation with lactate threshold.

Area of Science:

  • Exercise Physiology
  • Gerontology
  • Cardiorespiratory Fitness

Background:

  • Maximal oxygen uptake (VO2max) and ventilatory threshold (VeT) are crucial indicators of cardiorespiratory fitness.
  • Understanding age-related changes in these parameters is vital for assessing health and exercise capacity in older adults.

Purpose of the Study:

  • To measure ventilatory threshold (VeT) and maximal oxygen uptake (VO2max) in a large cohort of predominantly older subjects.
  • To assess the reproducibility and interobserver variability of VeT measurements.
  • To examine the relationship between VeT and venous lactate threshold (LaT) and their age-related decline.

Main Methods:

  • Maximal exercise testing using a bicycle ergometer with breath-by-breath gas exchange analysis.
  • Automated measurement system for ventilation and gas exchange variables.

Related Experiment Videos

  • Visual inspection of VE/VO2 and PETO2 curves to determine VeT; correlation analysis with LaT.

    • Main Results:

    • VeT demonstrated good day-to-day reproducibility and low interobserver variability (r = 0.941).
    • VeT correlated significantly with LaT (r = 0.79, P < 0.05), with LaT occurring later.
    • Both VO2max and VeT declined significantly with age, but VeT showed a less precipitous decline than VO2max.

    Conclusions:

    • VeT is a reliable measure in older adults, with good reproducibility and correlation to LaT.
    • Age-associated changes in skeletal muscle composition may explain the slower decline in VeT compared to VO2max.
    • These findings provide valuable insights into exercise physiology and aging, informing fitness assessments and exercise prescription for older populations.