The Liverpool Endurance Study
Four weeks of probiotic supplementation reduces GI symptoms during a marathon race
GI symptoms reported during 28-day supplementation
Gut symptoms during 28-day supplementation period
The number of moderate gut symptoms and number of days with these symptoms were significantly reduced in the last 14 days of Lab4 probiotic supplementation compared to the first two weeks (*P<0.05).
Gut symptom scores during each third of the race (Eur J Appl Physiol)
Gut symptoms during the marathon race
A significant reduction in the severity of gut symptoms was seen in the Lab4 probiotic group compared to placebo (*P=0.01) during the final third of the race.
A signification association between gut symptoms during the race and reductions in running speed was observed, especially towards the later stage of the race.
Reduction in average running speed (Eur J Appl Physiol)
Lap-by-lap average running speed (Eur J Appl Physiol)
Reduction in the average speed from the first to the last third of the race was significantly greater in the placebo group (14.2% reduction) compared to the Lab4 probiotic group (8% reduction, *P=0.03).