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Related Experiment Videos

Ventilation and blood lactate increase exponentially during incremental exercise.

S C Dennis1, T D Noakes, A N Bosch

  • 1Department of Physiology, University of Cape Town Medical School, Observatory, South Africa.

Journal of Sports Sciences
|October 1, 1992
PubMed
Summary
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This study suggests that during intense exercise, the body

Area of Science:

  • Exercise Physiology
  • Metabolic Response to Exercise
  • Acid-Base Balance

Background:

  • The traditional 'anaerobic threshold' model posits a sudden increase in blood lactate (BLa) during progressive exercise.
  • This threshold is often linked to the onset of metabolic acidosis and altered ventilatory (V) control.
  • However, the precise mechanisms driving ventilatory compensation for acidosis remain debated.

Purpose of the Study:

  • To investigate whether ventilatory compensation during incremental exercise aligns with continuous proton production or a sudden rise in BLa.
  • To examine the relationship between ventilation (V), oxygen uptake (VO2), carbon dioxide output (VCO2), and BLa concentration ([BLa]).
  • To challenge the 'anaerobic (lactate) threshold' hypothesis by exploring alternative models of acidosis development.

Main Methods:

Related Experiment Videos

  • 10 endurance-trained male cyclists performed incremental exercise tests to exhaustion.
  • Ventilation (V), oxygen uptake (VO2), carbon dioxide output (VCO2), and blood lactate concentration ([BLa]) were measured.
  • Regression analyses were used to model the relationships between these variables, comparing continuous exponential/hyperbolic models with threshold linear models.

Main Results:

  • Ventilatory, VCO2, and [BLa] responses to VO2 were better described by continuous exponential rate laws than by threshold linear equations.
  • Ventilation demonstrated a non-linear, exponential relationship with VCO2 and a hyperbolic relationship with [BLa].
  • These findings indicate a continuous, rather than abrupt, development of acidosis during progressive exercise.

Conclusions:

  • The data support a continuous development of acidosis during progressive exercise, challenging the concept of a sudden 'anaerobic (lactate) threshold'.
  • Ventilatory responses are more accurately modeled by continuous functions reflecting progressive physiological changes.
  • This suggests a more nuanced understanding of metabolic acidosis and its compensation during exercise is needed.