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Related Concept Videos

Diagnosing Acidosis and Alkalosis01:24

Diagnosing Acidosis and Alkalosis

Diagnosing acid-base imbalances involves systematically analyzing arterial blood samples, focusing on three key measurements: pH, bicarbonate (HCO3−) concentration, and carbon dioxide partial pressure (PCO2). This analysis follows a four-step process that helps identify the imbalance's underlying cause and nature.
First, the pH level is assessed to determine whether the blood pH is normal (7.35–7.45), low (acidosis), or high (alkalosis).
Next, the PCO2  and HCO3−  values are examined to...

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Related Experiment Video

Updated: Jun 25, 2026

Experimental Protocol of a Three-minute, All-out Arm Crank Exercise Test in Spinal-cord Injured and Able-bodied Individuals
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Experimental Protocol of a Three-minute, All-out Arm Crank Exercise Test in Spinal-cord Injured and Able-bodied Individuals

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Investigations of the lactate minimum test.

M A Johnson1, G R Sharpe, P I Brown

  • 1Nottingham Trent University, United Kingdom. michael.johnson@ntu.ac.uk

International Journal of Sports Medicine
|February 10, 2009
PubMed
Summary

The lactate minimum test showed good agreement with maximal lactate steady state (MLSS) power, but this correlation may be coincidental. The test

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biochemistry

Background:

  • Maximal lactate steady state (MLSS) is a key indicator of endurance capacity.
  • The lactate minimum test is a proposed alternative to determine MLSS.
  • Understanding the validity and influencing factors of the lactate minimum test is crucial for accurate physiological assessments.

Purpose of the Study:

  • To evaluate the agreement between lactate minimum power and MLSS power in cycling.
  • To determine if blood lactate changes during the lactate minimum test reflect constant power exercise.
  • To investigate the influence of different muscle groups on lactate minimum power.

Main Methods:

  • Study 1: Compared lactate minimum and MLSS power in 32 cyclists.
  • Study 2: Assessed blood lactate kinetics during the lactate minimum test versus constant power exercise in 8 subjects.

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  • Study 3: Examined the effect of arm-cranking versus cycling during the lactate elevation phase on lactate minimum power in 10 subjects.

    • Main Results:

    • Good agreement was found between lactate minimum and MLSS cycling powers (2 ± 22 W).
    • Blood lactate concentration changes during the incremental phase did not correlate with constant power exercise.
    • Lactate minimum power was significantly lower when arm-cranking was used for lactate elevation (157 ± 29 W vs. 168 ± 21 W).

    Conclusions:

    • While lactate minimum and MLSS powers show good agreement, this may be coincidental due to the influence of the lactate elevation phase.
    • The lactate elevation phase significantly impacts blood lactate responses, questioning the direct reflection of constant power exercise kinetics.
    • Further research is needed to refine the lactate minimum test and its application in exercise physiology.