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Related Experiment Videos

Relationship between mitochondrial DNA polymorphism and the individual differences in aerobic performance.

H Murakami1, R Soma, J Hayashi

  • 1Center for Tsukuba Advanced Research Alliance, University of Tsukuba, Tsukuba, 305-8574 Japan.

The Japanese Journal of Physiology
|December 6, 2001
PubMed
Summary

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Mitochondrial DNA (mtDNA) does not appear to influence endurance capacity or training response in young men. This study found no link between mtDNA variations and differences in VO2 max or its improvement after training.

Area of Science:

  • Exercise Physiology
  • Genetics
  • Mitochondrial Biology

Background:

  • Individual differences in endurance capacity and trainability are significant.
  • Mitochondrial DNA (mtDNA) is a potential genetic factor influencing these differences.
  • Cybrids, created by fusing platelets with mtDNA and rho(0)-HeLa cells lacking mtDNA, can reflect individual mtDNA polymorphisms.

Purpose of the Study:

  • To investigate the relationship between cybrid oxidative capacity and individual differences in endurance capacity.
  • To examine the association between cybrid oxidative capacity and endurance trainability.

Main Methods:

  • Forty-one sedentary young males underwent an 8-week endurance training program.
  • VO2 max was measured before and after training to assess endurance capacity and trainability.

Related Experiment Videos

  • Cybrids were created and their mitochondrial oxidative capacity, including O2 consumption, cytochrome c oxidase (COX) activity, and complex I + III activity, was analyzed.

    • Main Results:

    • No significant relationship was found between cybrid oxidative capacity and initial VO2 max.
    • Cybrid oxidative capacity did not differ between high and low initial VO2 max groups.
    • No significant differences in cybrid oxidative capacity were observed between high and low trainability groups.

    Conclusions:

    • Mitochondrial DNA (mtDNA) polymorphism is unlikely to be a major determinant of individual differences in endurance capacity or trainability in young, healthy, sedentary males.
    • Further research may be needed to explore other genetic or environmental factors contributing to these individual variations.