HYROX incident: Why runners can lose bowel control during intense races

A HYROX race, lasting 1-2 hours, subjects participants to intense endurance challenges that can cause urgency to use the toilet, loose stools, or in severe cases, accidental bowel leakage. Dr Shilpa Gupta, a consultant internal medicine specialist, explained that during maximal effort, the body prioritizes muscles and cardiovascular system over digestion.

Factors like heat, dehydration, physical stress, and continuous movement can further sensitize the gastrointestinal tract, leading to cramping, nausea, diarrhoea, or the need to use the toilet urgently.

Australian athlete Joanna Wietrzyk experienced sudden faecal incontinence during the HYROX Beijing event on September 12. She continued racing, finishing with a time of 1:01:23, despite the incident causing criticism and hygiene debates. The race, which combines eight 1-kilometre runs followed by strength training stations, has gained global popularity since its 2017 inception. HYROX now allows race directors to withdraw athletes if their bodily fluids pose a health or contamination risk to themselves or others.

Runner's diarrhoea is a common gastrointestinal issue that can occur during or after intense exercise. Dr Shankar Zanwar, a senior gastroenterologist, stated that it can result from prolonged running, high-intensity movements, or endurance training. Dr Zanwar warned that repeated leakage may indicate underlying issues like reduced bowel control, pelvic-floor weakness, irritable bowel syndrome, or other gastrointestinal conditions.

Nutritional factors, such as large meals close to exercise, excessive fibre, fatty foods, unfamiliar foods, high caffeine intake, and certain sports gels, can also trigger gastrointestinal discomfort in susceptible athletes.