Table 7. Bias (calculated as the difference between the criterion ABL90 and each analyzer) for blood lactate concentration, and the effect of the bias on power at calculated Lactate Threshold One (LT1) and Two (LT2). Bias calculations used the average of Device A and B combined. Threshold calculations employed the ‘modified’ Dmax method in ADAPT software (Australian Institute of Sport, 1995) using representative cycling and rowing data from incremental step tests.
| Lactate concentration band (mM) |
Analyser |
| ABL90 |
Edge |
i-STAT |
Lactate Pro |
Lactate Pro2 |
Scout+ |
Xpress |
| Bias (mM) |
| 0-1.9 |
0.0 |
0.34 |
-0.12 |
-0.17 |
0.32 |
-0.17 |
0.06 |
| 2.0-4.9 |
0.0 |
0.07 |
-0.29 |
-0.70 |
-0.06 |
-0.89 |
-0.13 |
| 5.0-9.9 |
0.0 |
-0.32 |
0.17 |
-1.76 |
-1.48 |
-2.15 |
-0.09 |
| 10.0-14.9 |
0.0 |
-0.29 |
0.00 |
-2.41 |
-1.81 |
-2.71 |
-0.70 |
| 15.0+ |
0.0 |
-2.05 |
0.62 |
-5.40 |
-2.16 |
-6.15 |
-6.70 |
| Threshold intensity |
Cycling |
| LT1 Power (W) |
189 |
191 |
194 |
191 |
187 |
192 |
190 |
| LT2 Power (W) |
249 |
249 |
253 |
249 |
249 |
249 |
226 |
|
Rowing |
| LT1 Power (W) |
206 |
209 |
209 |
211 |
207 |
215 |
209 |
| LT2 Power (W) |
268 |
277 |
263 |
281 |
281 |
286 |
263 |