Abstract
We examined the blood lactate response, in terms of the maximal post-exercise concentration (La(max)), time to reach La(max), and maximal lactate accumulation rate (VLa(max)), to swimming sprints of 25, 35, and 50 m. A total of 14 highly trained and elite swimmers (8 male and 6 female), aged 14-32, completed the 3 sprints in their specialization stroke with 30 min of passive rest in between. The blood lactate was measured right before and continually (every minute) after each sprint to detect the La(max). The VLa(max), a potential index of anaerobic lactic power, was calculated. The blood lactate concentration, swimming speed, and VLa(max) differed between the sprints (p < 0.001). The La(max) was highest after 50 m (13.8 ± 2.6 mmol·L(-1), mean ± SD throughout), while the swimming speed and VLa(max) were highest at 25 m (2.16 ± 0.25 m·s(-1) and 0.75 ± 0.18 mmol·L(-1)·s(-1)). The lactate peaked approximately 2 min after all the sprints. The VLa(max) in each sprint correlated positively with the speed and with each other. In conclusion, the correlation of the swimming speed with the VLa(max) suggests that the VLa(max) is an index of anaerobic lactic power and that it is possible to improve performance by augmenting the VLa(max) through appropriate training. To accurately measure the La(max) and, hence, the VLa(max), we recommend starting blood sampling one minute after exercise.