Document Detail

Ventilatory muscle training and the oxygen cost of sustained hyperpnea.
MedLine Citation:
PMID:  730593     Owner:  NLM     Status:  MEDLINE    
We measured the oxygen cost of breathing during sustained voluntary normocarbic hyperpnea in 12 subjects (4 endurance trainers, 4 strength trainers, and 4 controls) before and after a 5-wk training program limited to the ventilatory muscles (Leith, D. E., and M. E. Bradley. J. Appl. Physiol. 41: 508-516, 1976). "Steady-state" measurements of oxygen consumption were made at pulmonary ventilations ranging from 103 to 250 l/min. There were marked differences in the relationship between the metabolic cost of breathing and pulmonary ventilations between subjects. Spontaneously chosen respiratory frequencies ranged from 80 to 120 breaths/min and varied widely, even in a given subject, suggesting that the optima for frequency are broad or that optimization was imperfect. The subject group who performed endurance training increased by 19% the level of hyperpnea that they could sustain for 7--15 min, and increased their oxygen consumptions during this hyperpnea by an average of 67%. Following a 15-wk period of detraining, endurance trainers had lost 50% of their gains in the ventilations that they could sustain and in the accompanying oxygen consumptions. We conclude that ventilatory muscle endurance training can appreciably increase the aerobic endurance of the respiratory muscles.
M E Bradley; D E Leith
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology: respiratory, environmental and exercise physiology     Volume:  45     ISSN:  0161-7567     ISO Abbreviation:  J Appl Physiol Respir Environ Exerc Physiol     Publication Date:  1978 Dec 
Date Detail:
Created Date:  1979-03-24     Completed Date:  1979-03-24     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  7801242     Medline TA:  J Appl Physiol Respir Environ Exerc Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  885-92     Citation Subset:  IM    
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MeSH Terms
Muscles / metabolism*,  physiology
Oxygen Consumption*
Physical Education and Training*
Physical Endurance
Work of Breathing

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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