Effects of beta-alanine supplementation and high-intensity interval training on endurance performance and body composition in men; a double-blind trial
Question
Does beta-alanine supplementation enhance the endurance-performance and body-composition adaptations to six weeks of cycling HIIT in recreationally active college-aged men?
Summary
In recreationally active young men, six weeks of supervised cycling HIIT improved aerobic performance and total work. Beta-alanine appeared to add benefit in the second half of training for VO2peak, time to exhaustion, total work, and lean body mass, but the evidence mixes HIIT with a sports supplement.
Methodology
- Recreationally active college-aged men
- 46 participants.
- Cycle ergometer.
- Work intervals: 2 minutes.
- Recovery: 1 minute rest.
- Intensity: 90-115% of VO2peak power output.
- About 19-23 minutes plus any setup.
- 3 days/week.
- 6 weeks.
- Double-blind randomized supplementation trial with HIIT in both groups
- VO2peak, Time to exhaustion, Total work done, and Body composition were tracked.
Outcomes
VO2peak
Both groups improved by mid-test; only beta-alanine improved significantly from mid to post.
Pre-to-mid p<0.001; beta-alanine mid-to-post p=0.010; placebo p=0.118
time to exhaustion
Both groups improved by mid-test; only beta-alanine had a significant mid-to-post improvement.
Pre-to-mid p<0.001; beta-alanine mid-to-post p=0.043
total work
Total work improved over all time points in both groups, without significant between-group differences.
Time effect p>0.05 between groups; ES 0.898
body composition
Lean body mass increased in beta-alanine only; weight, body fat percentage, and fat mass did not significantly change.
Lean body mass in beta-alanine p=0.011
Insights
- A 5-6 x 2-minute cycling interval format is a useful endurance-building template.
- Failure-tolerant interval rules are useful: if a hard rep cannot be completed, recover and attempt the next bout.
- Supplement findings should remain outside workout-generation logic unless nutrition features are in scope.
Limitations
- Men only
- No HIIT-free control
- Supplement co-intervention
- No clear adverse-event reporting
- Lab cycle ergometer protocol
Safety
- The article did not report adverse events, injuries, or symptoms during beta-alanine/placebo plus HIIT.
- Participants were informed of potential risks before consent; training was supervised, heart rate was monitored during testing, and training logs were completed for each session.
- Supplement and training compliance did not differ significantly between groups, but the paper did not provide an exact attendance or dropout rate for the randomized sample.