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Kenyan dominance in distance running.

Henrik B Larsen1

  • 1The Copenhagen Muscle Research Centre, Rigshospitalet, Section 7652, Blegdamsvej 9, DK-2100, Copenhagen, Denmark. hboegh@cmrc.dk

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
|October 7, 2003
PubMed
Summary

Elite Kenyan runners excel due to superior running economy and high fractional oxygen consumption, not just maximal oxygen uptake. Their training and genetics contribute to efficient, high-performance endurance running.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Maximal oxygen consumption (VO2max), fractional VO2max utilization, and running economy are key physiological factors in running performance.
  • Kenyan and Caucasian elite runners exhibit similar VO2max levels, but black South African runners may have slightly lower VO2max.
  • Studies suggest black South African runners sustain a higher fraction of VO2max during long-distance running compared to white South African runners.

Purpose of the Study:

  • To investigate the physiological factors contributing to the superior endurance running performance of elite Kenyan athletes.
  • To compare VO2max, fractional VO2max utilization, and running economy among Kenyan, black South African, and Caucasian runners.
  • To explore the roles of genetics, body composition, and training in elite running performance.

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Main Methods:

  • Comparative analysis of physiological data (VO2max, fractional VO2max utilization, running economy) across different elite runner groups.
  • Examination of body mass index (BMI) and body shape, including leg morphology.
  • Review of studies on muscle fiber type and trainability in response to exercise interventions.

Main Results:

  • Kenyan elite runners demonstrate lower energy costs (better running economy) compared to Caucasian counterparts.
  • Black South African elite runners show similar low energy costs to Kenyan runners.
  • Similar trainability in VO2max and running economy was observed between Kenyan and Caucasian runners when subjected to training.
  • Genetics influencing body shape, such as long, slender legs, may contribute to improved running economy in Kenyan runners.

Conclusions:

  • High fractional VO2max utilization and excellent running economy appear to be more critical for elite endurance performance than a higher VO2max.
  • Genetics and effective training are crucial for elite Kenyan runners to achieve high VO2max and sustain high fractional utilization during endurance events.
  • Body composition and morphology, alongside training adaptations, play significant roles in optimizing running economy and overall performance.