Six sessions of sprint interval training increases muscle oxidative potential and cycle endurance capacity in humans

Burgomaster KA, Hughes SC, Heigenhauser GJ, Bradwell SN, Gibala MJ (2005) Journal of Applied Physiology
Title and abstract of Six sessions of sprint interval training increases muscle oxidative potential and cycle endurance capacity in humans

Key Takeaway

Just 6 sessions of sprint interval training (2 weeks) doubled endurance capacity and significantly increased muscle oxidative enzymes.

Summary

This landmark study from Martin Gibala's lab demonstrated remarkable adaptations from minimal sprint training.

Protocol:

  • 6 sessions over 2 weeks
  • 4-7 Wingate tests per session (30-sec all-out sprints)
  • 4 minutes recovery between sprints
  • Total sprint time: ~15 minutes over 2 weeks

Key findings:

  • Cycle endurance capacity doubled (51 to 102 minutes)
  • Citrate synthase activity increased 38% (marker of mitochondrial content)
  • Muscle buffering capacity improved
  • Resting muscle glycogen increased

Significance:

Demonstrated that brief, intense exercise could produce endurance adaptations traditionally associated with much longer training, launching the modern SIT research field.

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Source

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DOI: 10.1152/japplphysiol.01238.2004