Case Study: Extreme Weight Making Causes Relative Energy Deficiency, Dehydration, and Acute Kidney Injury in a Male Mixed Martial Arts Athlete

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Andreas M. Kasper Liverpool John Moores University

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Ben Crighton Liverpool John Moores University

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Carl Langan-Evans Liverpool John Moores University

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Philip Riley Pure Sports Medicine

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Asheesh Sharma Royal Liverpool University Hospital

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Graeme L. Close Liverpool John Moores University

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James P. Morton Liverpool John Moores University

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The aim of the present case study was to quantify the physiological and metabolic impact of extreme weight cutting by an elite male mixed martial arts athlete. Throughout an 8-week period, we obtained regular assessments of body composition, resting metabolic rate, peak oxygen uptake, and blood clinical chemistry to assess endocrine status, lipid profiles, hydration, and kidney function. The athlete adhered to a “phased” weight loss plan consisting of 7 weeks of reduced energy (ranging from 1,300 to 1,900 kcal/day) intake (Phase 1), 5 days of water loading with 8 L/day for 4 days followed by 250 ml on Day 5 (Phase 2), 20 hr of fasting and dehydration (Phase 3), and 32 hr of rehydration and refueling prior to competition (Phase 4). Body mass declined by 18.1% (80.2 to 65.7 kg) corresponding to changes of 4.4, 2.8, and 7.3 kg in Phases 1, 2, and 3, respectively. We observed clear indices of relative energy deficiency, as evidenced by reduced resting metabolic rate (−331 kcal), inability to complete performance tests, alterations to endocrine hormones (testosterone: <3 nmol/L), and hypercholesterolemia (>6 mmol/L). Moreover, severe dehydration (reducing body mass by 9.3%) in the final 24 hr prior to weigh-in-induced hypernatremia (plasma sodium: 148 mmol/L) and acute kidney injury (serum creatinine: 177 μmol/L). These data, therefore, support publicized reports of the harmful (and potentially fatal) effects of extreme weight cutting in mixed martial arts athletes and represent a call for action to governing bodies to safeguard the welfare of mixed martial arts athletes.

Kasper, Crighton, Langan-Evans, Close, and Morton are with the Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, United Kingdom. Riley is with Pure Sports Medicine, Cabot Place West, Canary Wharf, London, United Kingdom. Sharma is with the Dept. of Nephrology, The Royal Liverpool University Hospital, Liverpool, United Kingdom.

Address author correspondence to James P. Morton at J.P.Morton@ljmu.ac.uk.
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