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The Journal of Sports Medicine and Physical Fitness 2004 March;44(1):63-70


language: English

Effects of successive running and cycling on the release of atrial natriuretic factor in highly trained triathletes

Galy O. 1, Hue O. 1, Peyreigne C. 2, Boussana A. 4, Chamari K. 3, Libicz S. 4, Couret I. 5, Le Gallais D. 4, Préfaut C. 2

1 ACTES Laboratory Unit of Technical Sciences Training and Research Physical and Sports Achivities of Antille-Guyana Point a Pitre, France 2 Laboratory of Physiology of Interachions Central Service of Clinical Phisiology Unit of Respiratory Exploration Arnaud de Villeneuve University Hospital, Montpellier, France 3 National Center of Sports Medicine, El Menzah, Tunisia 4 Laboratory of Sport, Performance and Health, Montpellier, France 5 Central Service of Nuclear Medicine, Lapeyronie Hospital Montpellier, France


Aim. To eval­u­ate the influ­ence of suc­ces­sive run­ning and ­cycling on ­both exer­cise-­induced arte­ri­al hypox­e­mia (­EIAH) and atri­al nat­riu­ret­ic fac­tor (ANF) ­release, 5 tri­ath­letes per­formed 2 sep­ar­ate exer­cise ­trials.
Methods. One ­trial con­sist­ed of a 20-min+20-min suc­ces­sive ­cycle-run exer­cise (C1-R2) and the oth­er con­sist­ed of a 20-min+20-min suc­ces­sive run-­cycle exer­cise (R1-C2). Arterial oxy­gen­a­tion (PaO2) and ANF ­were deter­mined at pre-exer­cise, at the end of ­each 20-min seg­ment of exer­cise and ­after 10 min of recov­ery.
Results. ­EIAH was not­ed dur­ing C1-R2 and R1-C2 ­trials. A high­er ­EIAH was ­observed dur­ing run­ning com­pared ­with ­cycling per­formed in the 1st posi­tion (R1 vs C1) in the suc­ces­sion. In con­trast, no dif­fer­ence was ­observed ­between suc­ces­sive run­ning and suc­ces­sive ­cycling (R2 vs C2), (-10.6±7.0 vs -15.6±4.0 mmHg for C1-R2 and -20.9±6.0 vs -16.2±2.4 mmHg for R1-C2). ANF ­showed no dif­fer­ence ­between ­cycling and run­ning per­formed in ­first posi­tion, where­as a sig­nif­i­cant­ly low­er ANF was ­observed dur­ing suc­ces­sive ­cycling com­pared ­with suc­ces­sive run­ning (C2 vs R2) (19.9±3.72 vs 36.2±6.4 ­pmol.l-1). During recov­ery, nei­ther PaO2 nor ANF plas­ma ­returned to base­line lev­el ­after ­either ­trial.
Conclusion. This ­study pro­vides new infor­ma­tion on ­some of the phys­io­log­i­cal mod­ifi­ca­tions ­that ­occur dur­ing mul­ti-­sports. Specifically, the ­impact of the modal­ity of the suc­ces­sive exer­cise on ANF ­release and ­body ­fluid reg­u­la­tion was ­observed. Cycling as the suc­ces­sive exer­cise ­seems to ­cause low­er ANF ­release ­than ­does run­ning.

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