Relationship between optimal lactate removal power output and olympic triathlon performance

To investigate the relationships between race performance and parameters at the optimal power output for lactate removal, 10 male triathletes were examined. Exercise intensities for lactate removal were defined by calculating 50% of difference (Delta T) between running velocity (V-r) at individual anaerobic threshold (IAT) and at individual ventilatory threshold (IVT), then choosing 3 V-r: at IVT plus 50% Delta T (IVT+50%Delta T), at IVT, and at IVT minus 50% Delta T (IVT-50%Delta T). After a 6-minute treadmill run at 75% of difference between IAT and VO2 max, all triathletes performed a 30-minute active recovery run at IVT+50%Delta T, IVT, and IVT-50%Delta T. Capillary blood lactate was determined at 1, 3, 6, 9, 12, 15, 20, 25, and 30 minutes of recovery. The IVT-50%Delta T recovery was the most efficient V-r for lactate removal. Running velocities at IVT and IVT-50%Delta T were highly (p < 0.01) related to cycle, run, and overall race time. VO2 values at IAT, IVT+50%Delta T, and IVT were less (p < 0.05) related to split and overall race time. The variable most related to overall race time, as determined by stepwise multiple linear regression analysis, was the V-r at IVT-50%Delta T (r = 0.87, p = 0.001). The R-2 value of 0.76 indicated that V-r at IVT-50%Delta T could account for 76% of the variance in triathlon race time. This study shows that the race performances of triathletes are highly related to the V, at which the most efficient lactate removal (IVT-50%Delta T) occurs. These findings suggest that the assessment of V-r at IVT and IAT (from which V-r at IVT-50%Delta T are calculated) may be a useful method for monitoring training-induced adaptations and performance improvements in athletes who participate in Olympic triathlons.