Gastrointestinal : Complaints take a variety of forms -- eructation (belching), flatulence, nausea, vomiting, diarrhea, bloating, intestinal cramps, and stomachache. Running causes more GI complaints than swimming and cycling. In some studies on marathon runners and triathletes, up to 40 - 50% experienced some form of GI complaint..
Answered 3/22/2020
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