The aim of this study was to compare the running speed at lactate threshold (sLT) determined by the objective and individual methods Dmax (sLT Dmax) and log-log (sLTlog-log) being expected a better relationship between them than the relationship of them to the fixed lactate concentration method at 3.5 mM (sLT3.5mM). Seventeen amateur women runners, with experience of 10 km road races (age: 42.1 ± 6.7 year; height: 1.63 ± 0.03 m; body mass 57.2 ± 4.9 kg), participated in this study. They performed an incremental exercise test on a motorized treadmill, which the initial speed was 7 km/h, with increments of 1km/h every 3-min. Blood samples were collected between the stages, during a rest of 30-s. The sLT were 10.3 ± 1.4 (sLTlog-log), 10.9 ± 0.8 (sLT Dmax) and 11.6 ± 1.2 km/h (sLT3.5mM) being the sLT3.5mM significantly higher than sLTlog-log (P <0.001) and sLT Dmax (P = 0.024). Despite that, the limits of agreement range (±1.96 SD) among the sLT was similar, varying between ±1.48 and ±1.77 km/h and the correlation between sLT3.5mM and the speeds sLTlog-log (r = 0.70) and sLT Dmax (r = 0.78) was higher than the correlation between sLTlog-log and sLT Dmax (r = 0.65). In summary, the sLTlog-log and sLT Dmax speeds did not show a better relationship between themselves than the relationship of them to the sLT3.5mM.
agreement; comparison; Dmax; log-log
