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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


The Journal of Sports Medicine and Physical Fitness 2002 Settembre;42(3):295-9

lingua: Inglese

Influence of changes in nasal ventilation on estimated workload during submaximal field running

Bourdin M., Sallet P., Dufour A.-B. *, Lacour J.-R.

From the Labor­a­toire de Phys­io­log­ie de ­l’Exercice GIP Exer­cice, ­Faculté de ­Médecine ­Lyon-Sud Oul­lins Ced­ex, ­France
*Labor­a­toire de ­Biométrie, ­Génétique et Bio­log­ie des Pop­u­la­tions, Université ­Claude Ber­nard ­Lyon 1 Vil­leur­banne Ced­ex, ­France


PDF  ESTRATTI


Back­ground. ­Breathe ­Right® (BR) exter­nal ­nasal dila­tor ­have ­become increas­ing­ly pop­u­lar ­over the ­past few ­years, how­ev­er, the phys­io­log­i­cal ­basis for ­using BR ­remains ­unclear. We ­have exam­ined wheth­er alter­a­tion in ­nasal ven­ti­la­tion ­would influ­ence the meta­bol­ic ­cost of sub­max­i­mal run­ning.
Meth­ods. Meta­bol­ic ­cost was esti­mat­ed in 10 ­male endu­rance tri­ath­letes by meas­ur­ing ­heart ­rate (HR) and exer­cise per­cep­tion by meas­ur­ing the ­rate of per­ceived exer­tion (RPE) dur­ing sub­max­i­mal ­field run­ning. The pro­to­col con­sist­ed of 5 min of run­ning at 80% of ­their max­i­mal aero­bic veloc­ity (­MAVf, pre­vi­ous­ly deter­mined ­under ­field con­di­tions) for ­three ran­dom­ised experi­men­tal con­di­tions, sep­ar­at­ed by a 10 min ­rest. The con­di­tions ­were nor­mal ­nasal ven­ti­la­tion (N), no ­nasal ven­ti­la­tion (­using a ­nose ­clip) (NC) and ­with a BR.
­Results. Run­ning ­with the BR or ­with NC did not sig­nif­i­cant­ly influ­ence HR (N: 173±7, BR: 173±8, NC: 172±7 ­beat·min-1; F=0.01, p=0.99) or RPE (N: 12.1±1.7, BR: 11.8±1.9, NC: 13.2±0.8; F=1.88, p=0.18). We con­clude ­that alter­a­tion in ­nasal ven­ti­la­tion pro­duced by ­using BR or NC do not influ­ence HR or RPE in a ­group of tri­ath­letes run­ning 5 min at 80% of ­MAVf.
Con­clu­sions. The ­present ­study tend­ed to dem­on­strate ­that ­both ­nasal ven­ti­la­tion ­would not influ­ence the ­total meta­bol­ic ­cost, and ­that the BR ­device is not advan­ta­geous dur­ing ­high inten­sity exer­cise.

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