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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


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

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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