Characteristics of the V̇O2 Slow Component During Heavy Exercise in Humans Aged 30 to 80 Years

  • C. Bell
  • D. H. Paterson
  • M. A. Babcock
  • D. A. Cunningham
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 450)


At the onset of moderate intensity exercise oxygen uptake (V̇O2) increases exponentially from baseline to a new steady-state value. The steady-state V̇O2is linearly related to work rate, such that: ΔV̇O2/ΔWR ≈ 10 (ml·min-1·W-1. When the exercise intensity is heavy, inducing a sustained increase in blood lactate concentration, then the attainment of steady-state may be delayed, or even prevented, and a slow component of increasing V̇O2is observed (10). Thus, during heavy exercise the AV?̇O2/ΔWR relationship is increased (ΔV̇O2/ΔWR > 10) and becomes non-linear.


Work Rate Slow Component Blood Lactate Concentration Ventilatory Threshold Muscle Fibre Type 


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Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • C. Bell
    • 1
  • D. H. Paterson
    • 1
  • M. A. Babcock
    • 2
  • D. A. Cunningham
    • 1
    • 3
  1. 1.Centre for Activity and Ageing, School of KinesiologyThe University of Western OntarioLondonCanada
  2. 2.NeurodiagnosticsJohn D. Dingell VA Medical CenterDetroitUSA
  3. 3.Department of PhysiologyThe University of Western OntarioCanada

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