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Related Experiment Videos

Sprint training enhances ionic regulation during intense exercise in men

M J McKenna1, G J Heigenhauser, R S McKelvie

  • 1Department of Medicine, McMaster University, Hamilton, Ontario, Canada. michaelmckenna@vut.edu.au

The Journal of Physiology
|June 15, 1997
PubMed
Summary

Sprint training enhances exercise performance by improving muscle ion regulation, leading to reduced fatigue. However, this comes at the cost of increased systemic acidosis due to altered electrolyte and lactate concentrations.

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Inactivity and exercise training differentially regulate abundance of Na<sup>+</sup>-K<sup>+</sup>-ATPase in human skeletal muscle.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biochemistry

Background:

  • Sprint training is known to improve maximal exercise capacity.
  • Understanding the physiological adaptations, particularly concerning electrolyte and acid-base balance, is crucial for optimizing training protocols.

Purpose of the Study:

  • To investigate the effects of 7 weeks of sprint training on electrolyte concentrations and acid-base status during and after maximal exercise.
  • To determine how these changes relate to enhanced exercise performance and potential fatigue mechanisms.

Main Methods:

  • Six healthy males underwent maximal exercise tests before and after a 7-week sprint training program.
  • Blood samples were collected from arterial and femoral venous catheters during rest, exercise, and recovery.

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  • Analysis included whole blood and plasma ions (K+, Na+, Cl-, lactate) and acid-base variables (strong ion difference, pH, PCO2, HCO3-).

    • Main Results:

    • Sprint training increased total work output and reduced power decline during maximal exercise.
    • Post-training, lower plasma potassium (K+) and sodium (Na+) concentrations were observed.
    • Arterial plasma lactate ([Lac-]) increased post-training, while femoral venous [Lac-] remained unchanged.
    • A greater systemic acidosis was noted after training, characterized by lower strong ion difference (SID) and higher arterial plasma [H+].

    Conclusions:

    • Sprint training improves muscle ion regulation, evidenced by increased muscle Na+ and K+ uptake, contributing to enhanced performance and reduced fatigue.
    • The improved performance is associated with greater systemic acidosis, driven by lower plasma SID and higher plasma lactate.