Document Detail

Changes in carotid blood flow and electrocardiogram in humans during and after walking on a treadmill.
MedLine Citation:
PMID:  8149926     Owner:  NLM     Status:  MEDLINE    
Blood flow velocity in the common carotid artery and the electrocardiogram were measured simultaneously by telemetry in seven male subjects during 20-min walking on a treadmill at an exercise intensity corresponding to a mean oxygen uptake of 26.0 (SD 2.9) The mean cardiac cycle was shortened from 0.814 (SD 0.103) s to 0.452 (SD 0.054) s during this exercise. Of this shortening, 73% was due to shortening of the diastolic period and 27% to shortening of the systolic period. In the relatively small shortening of the mean systolic period [from 0.377 (SD 0.043) s to 0.268 (SD 0.029) s], the isovolumetric contraction time was shortened by 56%. During exercise, the heart rate (fc) increased by 79.4% [from 74.3 (SD 9.3) beats.min-1 to 133.3 (SD 14.8) beats.min-1], and the peak blood velocity (S1) in the common carotid artery increased by 56.1% [from 0.82 (SD 0.10) m.s-1 to 1.28 (SD 0.11) m.s-1]. After exercise, the S1 decreased rapidly to the resting level. The fc decreased more slowly, still being higher than the initial resting level 5 min after exercise. The diastolic velocity wave and the end-diastolic foot decreased during exercise. The blood flow rate in the carotid artery increased transiently by 13.5% at the beginning of exercise [from 5.62 (SD 0.63) ml.s-1 to 6.38 (SD 0.85) ml.s-1] and by 26.5% at the end of the exercise period [from 5.62 (SD 0.63) ml.s-1 to 7.11 (SD 1.34) ml.s-1].(ABSTRACT TRUNCATED AT 250 WORDS)
J He; Z L Jiang; H Tanaka; T Ikehara; A Takahashi; H Yamaguchi; H Miyamoto; T Iritani; Y Kinouchi
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  67     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1993  
Date Detail:
Created Date:  1994-05-06     Completed Date:  1994-05-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  486-91     Citation Subset:  IM    
Department of Physiology, School of Medicine, University of Tokushima, Japan.
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MeSH Terms
Blood Pressure / physiology
Carotid Artery, Common / physiology*
Exercise / physiology
Exercise Test
Heart Rate / physiology
Oxygen Consumption / physiology
Regional Blood Flow / physiology
Time Factors
Walking / physiology*

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