Noni fruit juice may increase oxygen uptake in athletes during exercise.

Current Research Journal of Biological Sciences 5(4): 177-181, 2013.
Noni fruit juice may increase oxygen uptake in athletes during exercise.
West BJ, Martínez R, Cano M, White A, Palu AK.

In a double blind, placebo-controlled, randomized human study, modest increases in oxygen uptake at 50-Watt workload (p = 0.005) and VO2 max (p = 0.009) occurred in cyclists who drank noni juice for 14 days. (available online at http://www.maxwellsci.com/print/crjbs/v5-177-181.pdf).