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Original articles  

The Journal of Sports Medicine and Physical Fitness 2001 December;41(4):470-8

language: English

Nostril dilatation increases capacity to sustain moderate exercise under nasal breathing condition

Tong T. K., Fu F. H., Chow B. C.

From the Department of Physical Education Hong Kong Baptist University, Hong Kong, China


Background. Effect of ­nasal breath­ing with­out and ­with nos­tril dil­a­ta­tion on sus­tain­abil­ity of mod­er­ate exer­cise (75% V.O2max) and select­ed res­pir­a­to­ry var­i­ables ­were exam­ined.
Methods. Experimental ­design: ­nine ­healthy ­male sub­jects com­plet­ed ­three ran­dom­ly ­assigned exhaus­tive tread­mill run­nings ­under ­three breath­ing con­di­tions: (i) oro­na­sal breath­ing (CON), (ii) ­nasal breath­ing ­with exter­nal ­nasal dila­tor ­strip (­NBENDS), and (iii) ­nasal breath­ing ­with ­fake ­nasal ­strip (­NBFNS).
Results. Pre-exer­cise ­peak ­nasal inspir­a­to­ry ­flow was ­increased ­with ­NBENDS but not ­with ­NBFNS. Pre-exer­cise ­nasal 12-sec max­i­mum vol­un­tary ven­ti­la­tion ­with ­NBENDS was great­er ­than ­that ­with ­NBFNS ­while ­both ­were ­less ­than oro­na­sal val­ue. Exercise ­time to exhaus­tion in ­NBFNS ­trial, ­which was 23.6±6.7% ­less ­than the CON val­ue, ­increased 31.9±12.3% ­under ­NBENDS con­di­tion. During exer­cise at exhaus­tion, ­although the dif­fer­ence in ven­ti­la­tion ­among all ­trials was not sig­nif­i­cant, low­er breath­ing fre­quen­cy in ­NBFNS and ­NBENDS exer­cis­es and high­er end-­tidal CO2 ten­sion in ­NBFNS ­trial ­were ­found in com­par­i­son to CON val­ues. Ratings of per­ceived mag­ni­tude of breath­ing ­effort (­RPMBE) and exer­tion (RPE) at exhaus­tion ­were sim­i­lar ­among all ­trials. However, ­RPMBE at exhaus­tion dur­ing ­NBFNS exer­cise was high­er ­than ­that at the iso-­time ­point dur­ing CON and ­NBENDS exer­cis­es. Similar ­result in RPE was ­found ­between ­NBFNS and CON exer­cis­es. After exer­cise, max­i­mum inspir­a­to­ry and expir­a­to­ry pres­sures ­reduced. The reduc­tion of ­each var­i­able was sim­i­lar ­among the ­three ­trials.
Conclusions. Nasal breath­ing reduc­es the sus­tain­abil­ity of mod­er­ate exer­cise meas­ured ­under oro­na­sal breath­ing con­di­tion. Nostril dil­a­ta­tion increas­es the capac­ity to sus­tain mod­er­ate exer­cise ­under ­nasal breath­ing con­di­tion.

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