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ULTIMO FASCICOLOTHE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

Rivista di Medicina, Traumatologia e Psicologia dello Sport

Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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Periodicità: Mensile

ISSN 0022-4707

Online ISSN 1827-1928

 

The Journal of Sports Medicine and Physical Fitness 2001 Dicembre;41(4):441-7

 Original articles

DLCO response to experimental cycle-run succession in triathletes

Hue O., Le Gallais D. *, Boussana A. *, Prefaut C. **

From the Laboratoire ­ACTE UFR-­STAPS des Antilles et de la Guyane, Campus de Fouil­lole, Pointe à Pitre, France (Guadeloupe)
* Laboratoire Sport, Performance, Santé, ­UPRES-EA, UFR-­STAPS Montpellier, France
** Laboratoire de Physiologie des Interactions Service Central de Physiologie Clinique Unité d’Exploration Respiratoire Centre Hospitalier Universitaire Arnaud de illeneuve
Montpellier, France

Background. We ­still ­know rel­a­tive­ly lit­tle ­about the fac­tors ­that ­define the abil­ity to per­form a ­good run ­after ­cycling in tri­ath­lon, how­ev­er, and the per­cep­tion of dis­com­fort dur­ing the ­first min­utes of ­this ­post-­cycling run­ning has yet to be sat­is­fac­tor­i­ly ­explained. The pul­mo­nary dif­fu­sion capac­ity for car­bon monox­ide (­DLCO) has ­been dem­on­strat­ed to be ­impaired ­after the ­cycle-run suc­ces­sion. Numerous caus­es ­have ­been sug­gest­ed to ­explain ­this phe­nom­e­non, but the ­exact mech­a­nism has not yet ­been deter­mined.
Methods. Thirteen ­young ­male tri­ath­letes par­tic­i­pat­ed in ­four dif­fer­ent exer­cise ­trials: 30 min of ­cycling fol­lowed by 20 min of run­ning (C-R, 1 min ­rest ­between C and R), 30 min of run­ning fol­lowed by 20 min of run­ning (R-R, 1 min ­rest ­between R and R), 30 min of ­cycling (C), and 30 min of run­ning (R). ­DLCO and alveo­lar vol­ume ­were simul­ta­ne­ous­ly meas­ured dur­ing 9 sec of ­breath-hold­ing ­before and 10 min ­after exer­cise. The trans­fer coef­fi­cient (KCO=­DLCO/VA) was ­then cal­cu­lat­ed. During all ­trials, ven­til­a­to­ry ­data ­were col­lect­ed eve­ry min­ute ­using an auto­mat­ed ­breath-by-­breath ­system.
Results. The ­results ­showed ­that 1) C-R and C ­induced sig­nif­i­cant and iden­ti­cal decreas­es in ­DLCO and KCO in ­post-­trial com­pared ­with pre-­trial meas­ure­ment (40.41±2.24 vs 43.49±2.36 ml·min-1·mm·Hg-1, p<0.01, and 39.37±2.16 vs 42.99±2.38 ml·min-1·mm·Hg-1, p<0.02, for C-R and C, respec­tive­ly) and 2) ­there ­were no ­DLCO decreas­es in ­post-­trial com­pared ­with pre-­trial meas­ure­ment in R-R and R.
Conclusions. We con­clud­ed ­that ­cycling exer­cise in ­itself ­seems to ­increase the imme­di­ate ­post-exer­cise ­DLCO impair­ment.

lingua: Inglese


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