MAXIMISING OLYMPIC DISTANCE TRIATHLON PERFORMANCE ...

2Difference between repeated measurementswith the Accusport (mmol/l)1.510.500 2 4 6 8 10 12 14-0.5-1-1.5-2Mean blood lactate concentration by repeated measurements with Accusport (mmol/l)Figure 2.Variation in blood lactate concentrations determined on the Accusport asa function of mean blood lactate concentrationSingle-trial reliability.The Accusport was found to have veryhigh single-trial reliability (R=0.99; SE M= 0.2 mmol_l -1 ). In addition, 95% ofrepeated measurements on theAccusport were within 0.4 mmol_l -1 ofthe initial measurement (Figure 2).Day-to-day reliability.The Accusport was found to have veryhigh day-to-day reliability when usingthe same standard lactate solutionseach day for seven days (R=0.99; SE M= 0.2 mmol_l -1 ).Validity of lactate thresholddetermination.The exercise intensity, heart rate andlactate concentration corresponding tothe LT (first rise in lactate concentrationabove resting value), was significantlyhigher when determined with theAccusport than when determined withthe Micro Stat (Table 1).Table 1. Means (+ SD) for the power output, heart rate and lactate concentrationassociated with the LT for both analysers. Also reported is the mean difference anddifference range between the two analysers. *P< 0.05AnaloxAccusportPower output(watts)105.5 + 39.2120.1 + 48.1 *Heart rate(beats_min -1 )144 + 13150 + 10 *Lactateconcentration(mmol_l -1 )1.3 + 0.31.9 + 0.2 *Mean DifferenceDifference Range17.4 + 16.6-53.7 - 22.77 + 7-18 - 50.6 + 0.3-1.2 - 0.170