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- W3160860219 abstract "In professional soccer players (n = 27), confounders of quantitative myoglobinuria following physical training were assessed in order to improve interpretation of post-exercise myoglobinuria.Urine samples were collected in the morning before training sessions, 48 to 72 hours following a game. Urine myoglobin was assayed using immunoturbidimetry. Blood was drawn 48 hours following training session. Creatinine was assayed using a Jaffe method. Creatine kinase (CK) activity was assayed according to the IFCC reference method. Serum myoglobin was assayed using the same assay as the one used for urine. Hp polymorphism was assessed on hemoglobin supplemented serum. Serum Hp concentration was assayed nephelometrically. Training intensity was assessed using a wearable GPS tracking system. Physical load monitoring included the covered total distance, the distance at different speed zones, and the number of sprints/accelerations/decelerations/jumps. Multiple regression analysis was used to detect the determinants of post-exercise myoglobinuria.Myoglobinuria negatively correlated with serum haptoglobin (Hp) concentration. Athletes presented with Hp values, which were lower than the Hp phenotype reference ranges, which can be explained by depletion of circulating Hp stores. Myoglobinuria was most pronounced in players carrying a Hp 2-2 phenotype, which is associated with the lowest Hp reference range. Myoglobin clearance was inversely correlated with Hp 2-2 concentration. Correlation between myoglobinuria and biomarkers of muscle damage was weak. Neither age nor glomerular filtration rate were found to be confounders of myoglobinuria. When comparing myoglobinuria with training intensity, the number of sprints, average acceleration speed, and maximal speed were determining factors for predicting exercise-induced myoglobinuria.In athletes, plasma myoglobin binding capacity is depleted. Moderate myoglobinuria not only should be regarded as a muscle damage marker, but also should be interpreted as an indicator for Hp depletion. Apart from its significance as a biomarker for muscle damage and rhabdomyolysis, myoglobinuria in athletes should be a warning that the heme binding capacity of plasma Hp is depleted, indicating an exhausted defense against Fenton chemistry induced free radicals. Fenton chemistry is associated with free radical formation, which is to be avoided because of the causative relationship with inflammatory processes and tissue damage." @default.
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- W3160860219 date "2021-01-01" @default.
- W3160860219 modified "2023-10-14" @default.
- W3160860219 title "Exercise Induced Myoglobinuria is Determined by Haptoglobin Polymorphism" @default.
- W3160860219 doi "https://doi.org/10.7754/clin.lab.2020.200855" @default.
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