Document Detail


Hemodynamics during active and passive recovery from a single bout of supramaximal exercise.
MedLine Citation:
PMID:  12665987     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The aim of this work was to study the differences in cardiovascular response during two modes of recovery [active (AR): pedalling at 40 W; and passive (PR): complete rest seated] from a single bout of supramaximal exercise. Eight male amateur soccer players underwent two supramaximal cycle-ergometer tests, each consisting of pedalling against a resistance equivalent to 150% of the maximum workload achieved in a previous incremental test, followed by randomly assigned AR or PR. Cardiodynamic variables were obtained using an impedance cardiograph. Subjects were also connected to a sphygmomanometer, for systolic and diastolic blood pressure, and to a metabolimeter for oxygen uptake (VO(2)) assessments. We measured: heart rate (HR), stroke volume (SV), cardiac output (CO), the inverse of myocardial contractility calculated as pre-ejection period/left ventricular ejection time ratio (PEP/LVET), mean blood pressure (MBP), thoracic electrical impedance ( Z(0)) as an index of central blood volume, and arterio-venous oxygen difference (A-V O(2) Diff.). PR caused a lower CO compared to AR [mean (SE): 7 (0.7) vs. 10.4 (0.6) l.min(-1 )at the 5th min of recovery] due to lower HR [106.2 (3.6) vs. 121.8 (4.5) bpm at the 5th min of recovery], SV [67.1 (5) vs. 86.1 (4.8) ml at the 5th min of recovery], and PEP/VET values [0.44 (0.007) vs. 0.39 (0.015) at the 5th min of recovery]. No differences were found in MBP and Z(0) between PR and AR [95.1 (1.9) vs. 92.3 (2.7) mmHg and 26.2 (1.1) vs. 26.6 (1) Omega respectively at the 5th min of recovery], while A-V O(2) Diff. values were higher during AR than during PR [108.8 (4.3) vs. 75.2 (5.4) ml.l(-1) at the 5th min of recovery]. Thus, although after a single bout of supramaximal exercise SV and CO are lower during PR than during AR, these differences are not due to an impairment of cardiovascular function, but are fully explained by the lesser muscular engagement that leads to a reduction in stimuli deriving from mechanoreceptors and central commands, thus causing a faster return of myocardial contractility and HR to resting values.
Authors:
Antonio Crisafulli; Valentina Orrù; Franco Melis; Filippo Tocco; Alberto Concu
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Publication Detail:
Type:  Journal Article     Date:  2003-03-04
Journal Detail:
Title:  European journal of applied physiology     Volume:  89     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2003 Apr 
Date Detail:
Created Date:  2003-03-31     Completed Date:  2003-07-29     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  209-16     Citation Subset:  IM; S    
Affiliation:
Dipartimento di Scienze Cliniche e Biologiche, Università degli Studi di Torino, Italy.
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MeSH Terms
Descriptor/Qualifier:
Adult
Arteries
Bicycling / physiology
Blood Pressure
Blood Volume
Cardiac Output
Cardiovascular Physiological Phenomena
Electric Impedance
Exercise / physiology*
Heart Rate
Hemodynamics*
Humans
Leg / physiology
Male
Movement / physiology
Myocardial Contraction
Oxygen / blood
Oxygen Consumption
Physical Endurance*
Stroke Volume
Thorax / physiology
Veins
Chemical
Reg. No./Substance:
7782-44-7/Oxygen

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