![]() The underlying exponential relationship between intensity (workload) and BLa concentration (Binder et al., 2008) allows sport scientists to quantitatively evaluate training adaptation, exercise work rate and to prescribe training intensities (Beneke et al., 2011, Faude et al., 2009). Blood lactate concentration during a graded exercise step test is used to identify the transition between aerobic and anaerobic energy contribution to exercise and therefore assess endurance capacity and performance potential (Faude et al., 2009). This is due to the ease of capillary blood sampling and the predictive and evaluative power of the lactate response to incremental exercise (Wasserman et al., 1973). 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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