Document Detail

Effects of a fast cable car ascent to an altitude of 2700 meters on EEG and ECG.
MedLine Citation:
PMID:  15722187     Owner:  NLM     Status:  MEDLINE    
In the Eastern Alps, the Dachstein massif with a height of almost 3000 m is an ideal location for investigating the effects of changes in altitude on the human body. Within a few minutes, a cable car facilitates an ascent from 1702 to 2700 m above sea level, where the partial pressure of oxygen is about 550 mmHg (as compared to 760 mmHg at sea level). In this study, 10 healthy subjects performed a reaction time task at 990 m and 2700 m in altitude. The subjects were instructed to perform a right hand index finger movement as fast as possible after a green light flashed (repeated 50 times). The corresponding electrocardiogram (ECG) and the electroencephalogram (EEG) were recorded. From the ECG heart rate and heart rate variability measures in the time and frequency domain were calculated. An event-related desynchronization/synchronization (ERD/ERS) analysis was performed with the EEG data. Finally, the EEG activity and the ECG parameters were correlated. The study showed that with the fast ascent to 2700 m the heart rate increased and the heart rate variability measures decreased. The correlation analysis indicated a close relationship between the EEG activity and the heart rate and heart rate variability. Furthermore it was shown for the first time that the beta ERS in the 14-18 Hz frequency range (post-movement beta ERS) was significantly reduced at high altitude. Very interesting also is the loss of correlation between EEG activity and cardiovascular measures during finger movement at high altitude. The suppressed post-movement beta ERS at the altitude of 2700 m may be interpreted as results of an increased cortical excitability level when compared with the reference altitude at 990 m above sea level.
Christoph Guger; Wolfgang Domej; Gerhard Lindner; K Pfurtscheller; Gert Pfurtscheller; Günter Edlinger
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-01-07
Journal Detail:
Title:  Neuroscience letters     Volume:  377     ISSN:  0304-3940     ISO Abbreviation:  Neurosci. Lett.     Publication Date:  2005 Mar 
Date Detail:
Created Date:  2005-02-21     Completed Date:  2005-04-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7600130     Medline TA:  Neurosci Lett     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  53-8     Citation Subset:  IM    
ARGE-Alpinmedizin, Austria.
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MeSH Terms
Electrocardiography* / methods,  statistics & numerical data
Electroencephalography* / methods,  statistics & numerical data
Heart Rate / physiology*
Middle Aged
Photic Stimulation / methods
Psychomotor Performance / physiology*
Reaction Time / physiology
Time Factors

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