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The purpose of this study was firstly, to determine the level of agreement between the Lactate Pro and Analox GM7 for the measurement of blood lactate, and secondly, to examine whether these analysers may be used interchangeably to identify lactate parameters routinely used in the physiological assessment of athletes. Twenty well-trained male cyclists performed an incremental cycle ergometry test; duplicate blood samples were taken simultaneously throughout the test for lactate determination using the two analysers. Power output and heart rate at LT, LT1, 2 mmol.L-1, and 4 mmol.L-1 were calculated from the lactate values obtained from the two analysers. There was a strong linear relationship between the two analysers (Lactate Pro=1.4541xAnalox GM7-0.1287; R2=0.969, p

Three prototype Analox hyperbaric analyzers (model SUB MK II P-S), modified by the manufacturer from a commercially available model designed for submarine escape situations, were evaluated as devices suitable for monitoring O2 and CO2 under pressure during Dry Deck Shelter (DDS) operations. Analyzers were tested in two locations in the laboratory: (1) on the laboratory bench at ambient pressure. and (2) inside a temperature-controlled hyperbaric chamber at pressures less than or equal 6 atmospheres absolute. The instruments were easy to use in the laboratory and provided no major operating problems during the test period. At 25 degrees C, they met desired accuracy limits for both O2 and CO2. However both cold and hot exposures caused O2 and CO2 readings to exceed these limits. The instruments also operated with a single set of new batteries for a sufficient time (6 hours daily over a multiday period) and over a range of ambient temperatures to support DDS operations. Following deliberate immersion, clearing water from the instruments' inlets and returning them to operators in the laboratory was often difficult, doing so in the field would be even more challenging. Before any decision can be made about advancing these analyzers to field-testing, the manufacturer needs to make the following changes to the instruments, and the laboratory needs to verify their acceptability with additional testing: (1) improving the compensation of gas measurements for changes in ambient temperature, and (2) redesigning the gas inlet to facilitate the clearing of water following accidental immersions.

This study aimed to compare the performance of a new portable lactate analyser against other standard laboratory methods in three conditions, normal (20 +/- 1.3 degrees C; 40 +/- 5 % RH), hot (40 +/- 2.5 degrees C; 40 +/- 5 % RH), and humid (20 +/- 1.1 degrees C; 82 +/- 6 % RH) conditions. Seven healthy males, ([Mean +/- SE]: age, 26.3 +/- 1.3 yr; height, 177.7 +/- 1.6 cm; weight, 77.4 +/- 0.9 kg, .VO(2)max, 56.1 +/- 1.9 ml x kg x min(-1)) undertook a maximal cycle ergometry test to exhaustion in the three conditions. Blood was taken every 3 min at the end of each stage and was analysed using the Lactate Pro LT-1710, the Accusport, the Analox GM7 and the Kodak Ektachem systems. The MANOVA (Analyser Type x Condition x Workload) indicated no interaction effect (F(42,660), = 0.45, p > 0.99, Power = 0.53). The data across all workloads indicated that the machines measured significantly differently to each other (F(4,743) = 14.652, p < 0.0001, Power = 1.00). The data were moderately to highly correlated. We conclude that the Lactate Pro is a simple and effective measurement device for taking blood lactate in a field or laboratory setting. However, we would caution against using this machine to compare data from other machines.