Exercise affects multiple bodily systems
The importance of the gut in digestion and providing energy substrates for exercise is well-documented.
Endurance athletes experience a high level of upper respiratory tract infections and gastrointestinal (GI) issues, including increased gut permeability, disruption of mucous thickness and higher rates of bacterial translocation. GI issues include symptoms such as belching, bloating, flatulence, side stitch, abdominal cramps, vomiting, diarrhoea and the urge to defecate during exercise.
The effect of exercise on the microbiome
A role for probiotics?
 Mach N & Fuster-Botella D 2017 Endurance exercise and gut microbiota: A review. J Sport Health Sci 6:179-197
 Shing CM et al 2013 Effects of probiotics supplementation on gastrointestinal permeability, inflammation and exercise performance in the heat. Eur J Appl Physiol DOI 10.1007/s00421-013-2748-y
 Rankin A et al 2017 ‘Microbes in sport’ – The potential role of the gut microbiotia in athlete health and performance Br J Sports Med 10.1136/bjsports-2016-097227
 Pyne DB et al 2014 Probiotics supplementation for athletes – Clinical and physiological effects. Eur J Sport Sci http://dx.doi.org/10.1080/17461391.2014.971879