Exercise-induced oxidatively damaged DNA in humans: evaluation in plasma or urine?

Physical exercise can induce oxidative damage in humans. 8-Hydroxy-2'-deoxyguanosine (8-OHdG) is a widely known biomarker of DNA oxidation, which can be determined in blood and urine. The aim of the present study was to compare these two biological fluids in terms of which is more suitable for the estimation of the oxidative damage of DNA by measuring the concentration of 8-OHdG one hour after maximal exercise by enzyme immunoassay.

Reliability of urine lactate as a novel biomarker of lactate production capacity in maximal swimming.

Context: Postexercise urine lactate may be a novel biomarker of lactate production capacity during exercise.

Objective: To evaluate the reliability and utility of the urine lactate concentration after maximal swimming trials between different training protocols (6 × 50 m and 3 × 100 m) and training states (active and nonactive swimmers).

Materials And Methods: Lactate and creatinine were determined by spectrophotometry in blood and urine.