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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS 

The Journal of Sports Medicine and Physical Fitness 2002 March;42(1):26-30

Copyright © 2009 EDIZIONI MINERVA MEDICA

lingua: Inglese

Plasma lactate recovery from maximal exercise with correction for variations in plasma volume

Berthoin S., Pelayo P., Baquet G., Marais G., Allender H., Robin H.

From the Laboratoire d’Etudes de la Motricité Humaine, Faculté des Sciences du Sport et de l’Education Physique, Université de Lille 2 *Services des Explorations Fonctionnelles Respiratoires, Hopital Calmette, Lille, France


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Back­ground. To com­pare plas­ma lac­tate con­cen­tra­tions and plas­ma lac­tate kinet­ics dur­ing recov­ery, for meas­ured and cor­rect­ed val­ues for chang­es in plas­ma vol­ume, ­after a max­i­mal aero­bic exer­cise.
Meth­ods. Six­teen ­male sub­jects per­formed an incre­men­tal and max­i­mal exer­cise in ­order to ­reach max­i­mal aero­bic pow­er. ­Prior to the exer­cise, at the end and dur­ing recov­ery (2, 5, 12 and 30 min), ­blood sam­ples ­were col­lect­ed ­through an ante­cu­bi­tal cath­e­ter. Sam­ples ­were ana­lysed for lac­tate, hem­a­toc­rit and hemo­glo­bin in ­order to cal­cu­late chang­es in plas­ma vol­ume. Plas­ma lac­tate con­cen­tra­tions ([La]p) ­were cor­rect­ed for chang­es in plas­ma vol­ume. Plas­ma lac­tate kinet­ics was esti­mat­ed ­through the ­ratio ­between [La]p ­after 5 min recov­ery ­minus [La]p ­after 30 min to ­time (25 min) and ­expressed in per­cent­age per min­ute.
­Results. Max­i­mal chang­es in plas­ma vol­ume (-19.7±3.8%) ­were cor­re­lat­ed to max­i­mal meas­ured [La]p (r=0.66, p<0.01). Max­i­mal meas­ured [La]p val­ues (14.9±2.6 ­mmol·l-1) ­were 17.3% high­er (p<0.001) ­than cor­rect­ed val­ues (12.7±2.0 ­mmol·l-1). The kinet­ics of [La]p ­decrease was sig­nif­i­cant­ly high­er (p<0.001) for meas­ured val­ues (2.38±0.29 %·min-1) ­than for cor­rect­ed val­ues (2.22±0.33 %·min-1).
Con­clu­sions. ­These ­results sug­gest­ed ­that chang­es in plas­ma vol­ume ­must be tak­en ­into ­account ­when ­peak ­postexer­cise plas­ma lac­tate con­cen­tra­tion or lac­tate recov­ery ­curves are ana­lysed.

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