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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS 

The Journal of Sports Medicine and Physical Fitness 2004 June;44(2):147-56

Copyright © 2009 EDIZIONI MINERVA MEDICA

lingua: Inglese

A perceptive individual time trial performed by triathletes to estimate the anaerobic threshold. A preliminary study

Groslambert A. 1, 2, Grappe F. 1, 2, Bertucci W. 1, 2, Perrey S. 1, 3, Girard A. J. 1, 2, Rouillon J. D. 1

1 Laboratory of Sports Sciences, Besançon, France 2 Laboratory of Applied Mechanics, Besançon, France 3 Laboratory of Health Sports Performance, Montpellier, France


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Aim. The aim of the ­study was to ­test the ­ability to esti­mate the ­power ­output (PO) and ­heart ­rate (HR) asso­ciated ­with “anaer­obic ­threshold” ­levels for tri­ath­letes by ­means of a 30-min per­cep­tive indi­vidual ­time ­trial (­PITT30).
­Methods. Thir­teen tri­ath­letes (8 ­males and 5 ­females) per­formed an incre­mental exer­cise ­test to esti­mate max­imal param­e­ters ­such as ­oxygen ­uptake, ­power ­output and ­heart ­rate. ­From ­this incre­mental exer­cise ­test, the indi­vidual anaer­obic ­threshold (IAT) and ven­til­a­tory ­threshold (VT) for all sub­jects ­were esti­mated. ­Then, the sub­jects com­pleted a ­PITT30 at ­self-­selected ­work inten­sity on a sta­tionary ergom­eter ­equipped ­with the SRM ­Training ­System. ­Mean ­values of PO, HR, and ped­alling ­cadence ­were ­recorded con­tin­u­ously ­between the 5th and the 30th min of the ­test.
­Results. Sig­nif­i­cant cor­re­la­tions ­were ­observed ­between the ­mean PO ­recorded ­during ­PITT30 and PO meas­ured at IAT (r=0.88; p<0.0001) and at VT (r=0.89; p<0.0001). Fur­ther­more, ­bias and ­limits of agree­ment con­firm the ­degree of asso­ci­a­tion ­between the 3 ­methods. How­ever, ­PITT30 ­over-esti­mated HR ­values com­pared to the ­values ­obtained at IAT and VT.
Con­clu­sion. It was con­cluded ­that, for tri­ath­letes, ­mean PO meas­ured ­with ­PITT30 ­allows a par­tial ­valid esti­ma­tion of PO asso­ciated ­with 2 ­known ­methods of “anaer­obic ­threshold” deter­mi­na­tion. The appli­ca­tion of ­PITT30 may ­offer a ­useful ­tool for ath­letes and ­coaches to esti­mate the “anaer­obic ­threshold” in ­order to con­trol accu­rately the ­training ­effects.

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