Document Detail


Cerebral autoregulation is temporarily disturbed in the early recovery phase after dynamic resistance exercise.
MedLine Citation:
PMID:  15834764     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
AIM: To determine cerebral blood-flow velocity (CBFV) and parameters of dynamic cerebral autoregulation (CA) during and after exhausting resistance exercise. METHODS: Strength endurance (23 repetitions) and maximal strength training (8 repetitions) in 16 female and 16 male athletes on a leg curler (m. quadriceps training; approx. 2 s contraction) in the upright position. Registration of ECG, blood pressure by Finapres, CBFV by transcranial Doppler (TCD), and breathing by a Zak breathing-belt. Additional repetitive ergospirometry (O2-uptake, CO2-elimination, ventilation) and blood gas analyses were performed in a subgroup of seven athletes. From BP and CBFV cerebrovascular resistance (CVR), pulsatility index (PI) as well as LF-power, gain and phase-angle (frequency analysis) were derived. RESULTS: All athletes showed significant (p<0.01) 15 % to 30 % increases in CBFV during both training sets without signs of flow depression due to Valsalva maneuvers. In the early recovery, when blood pressure rapidly decreased, CBFV amplitude significantly (p<0.01) increased for 60-80 seconds with mean flow (Vm) at the exercise level, while CVR and PI showed conflicting results, similar to a presyncopal reaction. Ergospirometry and blood gas analyses revealed no evidence of major changes in pCO2, but phase angle was reduced (p<0.001) after exercise, together with an LF power increase (p<0.001). CONCLUSION: An unexpected increase in CBFV amplitude and in Vm occurs directly after dynamic resistance exercise without increased pCO2, which is comparable to a maximum leg press with hypercapnia. CVR and PI results as well as data from frequency analysis show similarities to presyncopal reactions, on the one hand, and point towards a temporarily disturbed cerebral autoregulation, on the other.
Authors:
Andreas Koch; M Ivers; A Gehrt; P Schnoor; A Rump; H Rieckert
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Clinical autonomic research : official journal of the Clinical Autonomic Research Society     Volume:  15     ISSN:  0959-9851     ISO Abbreviation:  Clin. Auton. Res.     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-04-18     Completed Date:  2005-07-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9106549     Medline TA:  Clin Auton Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  83-91     Citation Subset:  IM    
Affiliation:
Dept. III, German Naval Medical Institute, Kopperpahler Allee 120, 24119, Kiel-Kronshagen, Germany. koch@email.uni-kiel.de
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MeSH Terms
Descriptor/Qualifier:
Adult
Blood Gas Analysis
Blood Pressure / physiology
Carbon Dioxide / blood,  metabolism
Cerebrovascular Circulation / physiology*
Electrocardiography
Exercise / physiology*
Exercise Test
Female
Fourier Analysis
Heart Rate / physiology
Homeostasis / physiology*
Humans
Male
Oxygen Consumption / physiology
Respiratory Function Tests
Rest / physiology
Spirometry
Vascular Resistance / physiology
Weight Lifting / physiology*
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide

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


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