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Statistical evidence consistent with two lactate turnpoints during ramp exercise

R H Morton1, Y Fukuba, E W Banister

  • 1Department of Statistics, Massey University, Palmerston North, New Zealand.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1994
PubMed
Summary
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This study found two distinct turnpoints in blood lactate concentration during incremental exercise, suggesting these transitions correspond to previously identified ventilation thresholds in athletes.

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biochemistry

Background:

  • Two ventilation thresholds are recognized during incremental exercise.
  • The relationship between blood lactate and ventilation thresholds requires further investigation.

Purpose of the Study:

  • To determine if two turnpoints in blood lactate concentration align with known ventilation thresholds.
  • To analyze blood lactate data during incremental exercise to exhaustion.

Main Methods:

  • Five trained athletes underwent incremental cycle ergometer exercise over three months.
  • Serial blood samples were collected and analyzed for lactate concentration.
  • Statistical models (no, one, or two turnpoints) were fitted to the lactate data.

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Main Results:

  • Oscillatory behavior in residuals indicated two turnpoints in lactate concentration.
  • A two-turnpoint model provided a significantly better fit than simpler models.
  • This suggests distinct transitions in blood lactate during ramp exercise.

Conclusions:

  • Two transitions in blood lactate concentration exist during incremental exercise.
  • These lactate transitions likely correspond to the two established ventilation thresholds.
  • This finding refines our understanding of physiological responses to exercise.