Original articles  CARDIOVASCULAR SYSTEM 

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

Copyright © 2009 EDIZIONI MINERVA MEDICA

lingua: Inglese

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.