Abstract P2040: Acute Effects of Weight Loss by Dehydration on Renal Function in Mixed Martial Arts

Abstract

Currently there is a significant growth in the world in the number of professional fighters and practitioners of Mixed Martial Arts. In order to promote greater preservation of the physical integrity of the athletes, weight categories were created, however some fighters in the attempt of insertion into inferior categories, use the dehydration for their drastic reduction of the weight. Hypothetically, the method used may trigger some damage to the body, such as a decrease in the volume of renal blood flow. This study aims to identify the acute effects of weight loss by dehydration on kidney function in a Mixed Martial Arts fighter. The study volunteer is MLC, 34 years old, male, black, single, natural and resident in Maceió-AL-Brazil, without metabolic diseases, with a family history of arterial hypertension. It does not use drugs or dietary supplementation. The athlete practices combat sports with participation in competitions in these three years, with an average loss of 7 kg to fight for dehydration during a month before the fights. The signature of the Free and Informed Consent Term of the athletes was collected. Three collections were carried out: one month before the fight, the official weighing day and the day of the event. According to the data presented in the present study, in response to reduction of body weight by dehydration for insertion in a lower fighting category of around 7 kg, it was observed that the athlete presented some abnormalities during the body weight loss / gain cycle as glycosuria, non-reversible positive leukocyturia and proteinuria within 24 hours, elevated serum creatinine (1.3 mg / dL) and urea (42 mg / dL) during the peak of dehydration (day of weighing and fighting). Blood ureic nitrogen / creatinine ratio (15.8) and creatinine clearance (126.1 mL / min) were elevated during the three moments of observation, namely 30 days pre-fight, day of weighing and fighting. Elevated creatinine clearance suggests renal damage with increased filtration rate with possible renal damage from dehydration. We are completing the analysis of a further 10 athletes, and our data suggest the need for guidance of these athletes so that the training method is less detrimental to their physical integrity.