Document Detail

Haemodynamic responses following intermittent supramaximal exercise in athletes.
MedLine Citation:
PMID:  15328308     Owner:  NLM     Status:  MEDLINE    
We aimed to investigate haemodynamics during active and passive recovery following repeated bouts of supramaximal exercise. Seven male athletes underwent two sessions of supramaximal exercise which consisted of a warm-up and of five bouts of cycling at the maximum speed possible for 30 s against a resistance equivalent to 150% of the maximum workload achieved in a previous incremental test. Bouts were separated by 1 min of recovery and followed by 10 min of recovery which was either active (pedalling at 40 W) or passive (completely rest seated on the cycle). Haemodynamic variables were evaluated by means of impedance cardiography. Heart rate (HR), stroke volume (SV), cardiac output (CO), mean blood pressure (MBP), thoracic electrical impedance (Z0) as an inverse index of central blood volume, and systemic vascular resistance (SVR) were assessed. The main findings were that active recovery, with respect to passive recovery, induced higher changes from baseline in HR (+29.1 +/- 4.5 versus +15.6 +/- 2.9 beats min(-1) at the 10th minute of recovery, P < 0.05), SV (+19.9 +/- 5.6 versus -6.4 +/- 3.3 ml, P < 0.01) and CO (+3.8 +/- 1.2 versus +0.4 +/- 0.2 l min(-1), P < 0.01). Furthermore, MBP was similar between the two kinds of recovery despite an increase in Z0 during passive compared to active recovery. These results suggest that the faster haemodynamic recovery towards baseline and the decrease in cardiac preload during passive recovery may be successfully prevented by cardiovascular regulatory mechanisms which include an increase in SVR, thus avoiding a drop in blood pressure.
Antonio Crisafulli; Celestino Carta; Franco Melis; Filippo Tocco; Francesco Frongia; Uberto M Santoboni; Pasquale Pagliaro; Alberto Concu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-08-24
Journal Detail:
Title:  Experimental physiology     Volume:  89     ISSN:  0958-0670     ISO Abbreviation:  Exp. Physiol.     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-11-05     Completed Date:  2005-03-15     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  9002940     Medline TA:  Exp Physiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  665-74     Citation Subset:  IM    
Department of Sciences applied to Biological Systems, Section of Human Physiology, University of Cagliari, Via Porcell 4, 09124 Cagliari, Italy.
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MeSH Terms
Blood Pressure
Cardiac Output
Exercise / physiology*
Exercise Test
Heart Rate
Physical Endurance*
Stroke Volume
Time Factors

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

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