Document Detail

Modulation of the ventilatory increase at the onset of exercise in humans.
MedLine Citation:
PMID:  9342799     Owner:  NLM     Status:  MEDLINE    
The fast initial increase in ventilation at the start of exercise is generally assumed to be of reflex origin (exercising limbs) and/or caused by a 'feedforward' mechanism increasing breathing via brainstem respiratory centres or cortical areas controlling respiratory muscles. We wanted to test whether this ventilatory increase is in part a learned response which can be modified. Eleven subjects did two 20 min low-intensity arm-cranking exercise bouts on eight different days. Seven subjects were assigned to the experimental group which performed exercise paired with an 1.5 L external dead space. Before and after their eight exercise 'training'-days, these subjects did the same exercise without dead space. At the beginning of the first post-training exercise test (without dead space), the ventilatory increase at the start of exercise (sum of the first four breaths) was significantly increased (31.1 +/- 4.1 L . min-1) compared to the pre-training test session (24.4 +/- 3.9 L . min-1). No significant change was observed in the control group. We conclude that part of the ventilatory increase at the start of exercise can be modulated and might possibly be a learned response.
D Helbling; U Boutellier; C M Spengler
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Respiration physiology     Volume:  109     ISSN:  0034-5687     ISO Abbreviation:  Respir Physiol     Publication Date:  1997 Sep 
Date Detail:
Created Date:  1997-12-05     Completed Date:  1997-12-05     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0047142     Medline TA:  Respir Physiol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  219-29     Citation Subset:  IM; S    
Swiss Federal Institute of Technology Zurich, Switzerland.
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MeSH Terms
Carbon Dioxide / physiology
Heart Rate / physiology
Oxygen / physiology
Physical Exertion / physiology*
Respiration / physiology*
Respiratory Dead Space
Respiratory Function Tests
Tidal Volume / physiology
Reg. No./Substance:
124-38-9/Carbon Dioxide; 7782-44-7/Oxygen

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

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