ABSTRACT
CrossFit is a high-intensity physical activity modality that, despite its numerous health benefits, poses a risk of exercise-related injuries. The rare but serious complication of exertional rhabdomyolysis is a good example. There are few case reports describing this condition, and to the best of the author's knowledge, this is the first published case of CrossFit-induced rhabdomyolysis reported in Brazil - one of the most influential countries in the world of CrossFit. Our case report describes a 45-year-old male, an experienced Level 2 CrossFit Coach, who presented with progressive upper limb pain and dark urine two days after a routine CrossFit workout. Physical examination revealed muscle stiffening and pain upon palpation. Laboratory tests showed significantly elevated creatine phosphokinase (CPK) levels (126.891 U/L) and abnormal values of lactate dehydrogenase, alanine aminotransferase, and aspartate aminotransferase. The patient was diagnosed with exercise-induced rhabdomyolysis and treated with aggressive intravenous and oral hydration, with complete clinical improvement by the fifth day of hospitalization. The patient was dismissed without any complications and with progressively decreasing levels of CPK, with ambulatorial follow-up arranged. CrossFit-induced rhabdomyolysis, although rare, represents an important health concern due to the possibility of severe systemic consequences. The present case highlights the importance of early detection and treatment of exertional rhabdomyolysis, even in well-conditioned athletes.
