Creatine Works Even When You Can't Breathe: Freediver Trial Shows
Creatine is famous for helping you lift heavier and sprint harder, but can it help when you are not breathing at all? A new double-blind trial in trained freedivers found that a 7-day loading phase of 20 g/day boosted total work and time to exhaustion on a breath-hold cycling test. Strangely, blood lactate ended up lower in the creatine group than in placebo despite the better performance. Here is what the study did, who might benefit, and why a sample of just 20 divers means you should keep your expectations in check.
Guarana vs Caffeine: Same Dose, Only Guarana Lifted Peak Power
Same caffeine dose, different capsule, and only guarana produced a statistically significant boost in peak power. In a randomized crossover trial of 18 active men, guarana raised peak power output by 4.0% over placebo while anhydrous caffeine did not reach significance. But here's the catch: guarana didn't significantly beat caffeine head-to-head, and the differences between them were only descriptive. Here's what the numbers show, where the study falls short, and how to dose guarana by caffeine content if you want to try it.