Abstract
The specific role of autonomic vascular control in determining non-linear behaviour of RR intervals is not clear. In 10 T12-L4 paraplegic subjects (light vascular autonomic impairment), 12 T 5-T11 paraplegic subjects (moderate vascular autonomic impairment), and 24 controls RR time series were recorded (10 min): 1) in resting supine position; 2) sitting on the wheelchair and 3) during a light (5W) arm exercise. Fractal Dimension (FD), Approximate Entropy (ApEn) and the a scaling exponent (α-DFA, Detrended Fluctuation Analysis) were calculated. The lesional level significantly affected ApEn (p=0.004), FD (p=0.007) and α-DFA (p=0.002). Autonomic activation did not influence FD and α-DFA, but significantly affected ApEn (p=0.03S). It seems that FD and α-DFA are influenced by the changes in nonlinear RR dynamics due to vascular autonomic impairment but not to autonomic activation, whereas ApEn may be equally responsive to either condition.
Original language | English |
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Title of host publication | Computers in Cardiology |
Editors | A. Murray |
Pages | 713-716 |
Number of pages | 4 |
Volume | 30 |
Publication status | Published - 2003 |
Event | Computers in Cardiology 2003 - Thessaloniki Chalkidiki, Greece Duration: Sep 21 2003 → Sep 24 2003 |
Other
Other | Computers in Cardiology 2003 |
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Country/Territory | Greece |
City | Thessaloniki Chalkidiki |
Period | 9/21/03 → 9/24/03 |
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine
- Software