Published On: Tue, May 19th, 2015

Study: Factors Other than Maturation During Puberty Influence Blood Lactate Responses to Exercise

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lactateThis study aimed to evaluate whether fixed whole blood lactate reference values of 2.5 and 4.0 mmol l-‘ corresponded to the equivalent level of exercise in children and adults, and to see if differences existed between groups of boys classified as prepubertal and teenage. This could be important when recommending optimal training intensities and evaluating children’s exercise endurance capacity.

In this article, written by Tolfrey and Armstrong under the title “Child-adult differences in whole blood lactate responses to incremental treadmill exercise”, the subjects were 26 prepubertal boys, 26 teenage boys and 23 men.

In conclusion, the authors found that unlike men, prepubertal and teenage boys are able to exercise at intensities close to those which elicit peak VO2 without accumulating high levels of blood lactate. Conversely, the exercise intensity corresponding to the 2.5 mmol l-‘ lactate concentration results in a similar % peak VO2 in prepubertal boys, teenage boys and men. Factors other than maturation appear to influence whole blood lactate responses to exercise.

The reason why physiological responses corresponding to blood lactate were different when comparing the boys and men at the higher exercise intensity and not the lower intensity is unknown.

These results should be taken into account when considering physiological variables corresponding to fixed blood lactate concentrations to monitor and assess prepubertal and teenage boys’ endurance performance.  More information available at  Laktate.

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