Monitoring of blood lactate (BLa) concentration during exercise is commonplace in sports physiology laboratories and in the field. In conclusion, in a clinical setting where BLa is generally <15 mM the Edge and Xpress devices are relevant, but for athlete testing where peak BLa is important for training prescription the Edge and Lactate Pro2 are preferred. In all cases, bias (negative) was the major contribution to the √MSE. The √MSE indicated that both the Edge and Xpress had low total error (~0-2 mM) for lactate concentrations 15 mM. Reliability was assessed as the within-sample standard deviation (wsSD) of the six replicates accuracy as the bias compared with the ABL90 and overall error (the root mean squared error (√MSE)) was calculated as the square root of (wsSD 2 and bias 2). Each sample was measured simultaneously ~6 times on each device. ![]() ![]() Two devices of each brand of analyser were assessed using 22 x 6 mL blood samples taken from five subjects at rest and during exercise who generated lactate ranging ~1-23 mM. ![]() The reliability and accuracy of five portable blood lactate (BLa) analysers (Lactate Pro, Lactate Pro2, Lactate Scout+, Xpress™, and Edge) and one handheld point-of-care analyser (i-STAT) were compared to a criterion (Radiometer ABL90).
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