Key Takeaway
Comprehensive meta-analysis of 28 studies confirming HIIT produces significantly greater VO2max improvements than continuous endurance training.
Summary
This meta-analysis analyzed 28 controlled trials with 723 participants comparing high-intensity interval training to continuous endurance training for VO2max improvement.
Key findings:
- HIIT produced significantly greater VO2max improvements than continuous training
- Mean difference: 3.03 mL/kg/min favoring HIIT
- Effect was consistent across different populations
- Running-based HIIT showed larger effects than cycling
Protocol insights:
- Interval lengths of 3-5 minutes showed greatest effects
- Work:rest ratios around 1:1 to 2:1 were effective
- 8+ weeks of training needed for maximal adaptation