Document Detail

Phase relation and breathing pattern during locomotor/respiratory coupling in uphill and downhill running.
MedLine Citation:
PMID:  7650857     Owner:  NLM     Status:  MEDLINE    
Differential effects of uphill and downhill running on phase relation between locomotor and respiratory cycles were studies in nine experienced runners who were instructed to run uphill and downhill on a sloped surface at comfortable and constant speeds (actually 1.7-4.4 m s-1). Timings of footstrike and onsets of inspiration and expiration were measured to compute respiratory cycle duration (Ttot), inspiratory time (Ti), duty cycle (Ti/Ttot), and stride time (Ts). Incidence of locomotor/respiratory coupling (LRC) was determined based on steadiness of Ttot and Ts (within +/- 0.1 s in SD) and Ttot/Ts (LRC ratio, integer or a half-integer multiples). Both in the uphill and downhill running, LRC ratio observed was 1:1, 2:1, and 2.5:1. Ti/Ttot during LRC was 0.41-0.49, which depended on the combinations of Ts and LRC ratio but not on the running conditions. In the uphill running, the onset of inspiration subsequent to footstrike was seen during the first half period (corresponding to the support phase) of the step interval (Ts/2, the time interval between the right and left footstrikes) in 7 of the 9 subjects, while in the downhill running it occurred during the last half period of the step interval (the floating phase) in all subjects. For onset of expiration, no consistent relation to footstrike was observed. These results suggest that the mechanical constraints of running on the respiratory system affect the phase relation between locomotor and respiratory cycles but not Ti/Ttot during LRC.
N Takano
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Japanese journal of physiology     Volume:  45     ISSN:  0021-521X     ISO Abbreviation:  Jpn. J. Physiol.     Publication Date:  1995  
Date Detail:
Created Date:  1995-09-26     Completed Date:  1995-09-26     Revised Date:  2007-03-21    
Medline Journal Info:
Nlm Unique ID:  2985184R     Medline TA:  Jpn J Physiol     Country:  JAPAN    
Other Details:
Languages:  eng     Pagination:  47-58     Citation Subset:  IM    
Department of School Health, Faculty of Education, Kanazawa University, Japan.
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MeSH Terms
Foot / physiology
Respiration / physiology*
Time Factors

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

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