Document Detail

Transient and steady-state cardiopulmonary responses to combined rhythmic and isometric exercise.
MedLine Citation:
PMID:  1425628     Owner:  NLM     Status:  MEDLINE    
The transient and steady-state cardiopulmonary responses to combined rhythmic (R) and isometric (I) exercise were examined in nine subjects. Isometric exercise at 30% maximal voluntary contraction (MVC) was started 1.5 min prior to either a 50% or 75% maximal oxygen uptake (VO2max) cycle ride and continued for 1.5 min into the 10-min R. Systolic (Pas) and diastolic (P(ad)) blood pressure, heart rate (fc), inspired ventilation volumes (VI), and oxygen uptake (VO2) were recorded every 30 s throughout each experiment. Responses to I effort alone were recorded for comparison with experiments in which the combined exercises were performed during the first 1.5 min when R had not yet begun. Pas responses in the first 1.5 min of I (no R) showed the typical rapid linear increase. Addition of the R effort further increased Pas to levels which remained nearly constant (steady state) throughout R. R alone produced a slower Pas increase to approximately the same steady-state levels as those of the combined R and I exercise. For P(ad), the linear increase which occurred during the first 1.5 min of I was attenuated with the superimposition of R. Following cessation of I, P(ad) fell rapidly during continued R to levels not different from experiments with R alone. The fc during I alone increased slightly. As I continued, the onset of the R induced a further rapid increase in fc to levels not different from R alone. The VI showed a similar response to fc. VO2 during I alone did not change significantly.(ABSTRACT TRUNCATED AT 250 WORDS)
D E McCoy; R L Wiley; R P Claytor; C L Dunn
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  65     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1992  
Date Detail:
Created Date:  1992-12-14     Completed Date:  1992-12-14     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  295-301     Citation Subset:  IM; S    
Department of Zoology, Miami University, Oxford, OH 45056.
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MeSH Terms
Blood Pressure / physiology
Exercise / physiology*
Heart Rate / physiology
Hemodynamics / physiology*
Lung / physiology*
Oxygen Consumption / physiology
Respiration / physiology
Respiratory Mechanics / physiology

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