Mixed martial arts and the danger of extreme weight cutting

By Christopher Kirk, Lecturer in Sport and Exercise Physiology, Sheffield Hallam University

The sight is well known to all fans of mixed martial arts (MMA). A fighter walks onto a stage on a Friday evening, waving to the cheering crowd before stepping onto a scale. The fighter waits nervously for a few moments as an official checks their weight to see if they’ve qualified for their chosen weight division.

Weigh-ins happen the day before every MMA fight. They’re designed to ensure both competitors are the same size, theoretically making a fair contest. Importantly, this is the only time a fighter’s weight is checked by organisers – meaning they only need to be “on weight” for…

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