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Related Experiment Videos

Live high:train low increases muscle buffer capacity and submaximal cycling efficiency.

C J Gore1, A G Hahn, R J Aughey

  • 1Australian Institute of Sport, Adelaide, South Australia, Australia.

Acta Physiologica Scandinavica
|December 12, 2001
PubMed
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Hypoxic exposure, through live high:train low (LHTL) altitude training, significantly increased muscle buffer capacity in male athletes. This adaptation also improved exercise efficiency and reduced oxygen consumption during normoxic exercise.

Area of Science:

  • Exercise Physiology
  • Altitude Training Adaptations
  • Sports Science

Background:

  • Altitude training is a common strategy for athletes to enhance performance.
  • The 'live high:train low' (LHTL) method involves sleeping at altitude while training at lower elevations.
  • The specific physiological adaptations, particularly to muscle buffering and mechanical efficiency, require further elucidation.

Purpose of the Study:

  • To investigate the effects of simulated moderate altitude exposure on muscle buffer capacity (beta(m)) and mechanical efficiency in male athletes.
  • To determine if hypoxic exposure alone, via LHTL, can induce beneficial physiological changes for exercise performance.
  • To analyze changes in oxygen consumption (VO2) and peak oxygen uptake (VO2peak) following LHTL.

Main Methods:

Related Experiment Videos

  • A controlled study comparing a control group (CON) with a live high:train low (LHTL) group over 23 nights.
  • LHTL group slept at simulated moderate altitude (3000 m) while training near sea level (600 m).
  • Measurements included whole-body VO2 during cycle ergometry, VO2peak, total work, and vastus lateralis muscle biopsies analyzed for beta(m) and metabolites.

Main Results:

  • Muscle buffer capacity (beta(m)) increased by 18% (P < 0.05) after LHTL.
  • VO2peak decreased by 7% (P < 0.05) post-LHTL, while total work was maintained.
  • Submaximal VO2 was reduced by 4.4% (P < 0.05), and mechanical efficiency improved by 0.8% (P < 0.05) after LHTL.

Conclusions:

  • Hypoxic exposure, per se, is demonstrated to increase muscle buffer capacity.
  • LHTL altitude training leads to improved exercise efficiency and reduced oxygen cost during normoxic exercise.
  • These findings suggest improved mechanical efficiency is a fundamental adaptation to LHTL, potentially due to altered fuel utilization.