Document Detail

Effects of paraplegia on cardiac autonomic regulation during static exercise.
MedLine Citation:
PMID:  20855982     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: The aim of this study was to examine whether autonomic modulation of heart rate as measured by heart rate variability and heart rate complexity at rest and during static handgrip exercise differs between individuals with and without paraplegia. This study also examined the relationships between heart rate complexity and heart rate variability parameters. DESIGN: Heart rate variability and complexity were evaluated in 20 individuals with paraplegia and in 20 individuals without paraplegia during 3 mins of rest and 2 mins of static handgrip exercise at 30% of maximum isometric strength. Spectral decomposition of heart rate variability was used to obtain total power, power in low-frequency and high-frequency ranges, and the ratio of low- to high-frequency power. Heart rate complexity was quantified with sample entropy, a measure of irregularity of the beat-to-beat time series. RESULTS: Sample entropy was lower (P < 0.05) at rest and during exercise in participants with paraplegia. Total, high-, and low-frequency powers as well as the ratio of low- to high-frequency power did not differ between groups. Sample entropy did not significantly correlate with low- and high-frequency powers or their ratio. CONCLUSIONS: Individuals with paraplegia show lower heart rate complexity at rest and during static exercise. This finding may have implications for cardiovascular morbidity in persons with paraplegia. Heart rate complexity may provide unique information regarding cardiac autonomic modulation, different from that provided by traditional heart rate variability measures.
Stamatis Agiovlasitis; Kevin S Heffernan; Sae Young Jae; Sushant M Ranadive; Miyoung Lee; Mina C Mojtahedi; Bo Fernhall
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American journal of physical medicine & rehabilitation / Association of Academic Physiatrists     Volume:  89     ISSN:  1537-7385     ISO Abbreviation:  Am J Phys Med Rehabil     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-09-21     Completed Date:  2010-10-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8803677     Medline TA:  Am J Phys Med Rehabil     Country:  United States    
Other Details:
Languages:  eng     Pagination:  817-23     Citation Subset:  AIM; IM    
Department of Kinesiology, Mississippi State University, Mississippi, USA.
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MeSH Terms
Autonomic Nervous System / physiopathology*
Baroreflex / physiology
Case-Control Studies
Cohort Studies
Exercise / physiology*
Hand Strength / physiology
Heart Rate / physiology*
Isometric Contraction / physiology*
Lumbar Vertebrae
Paraplegia / etiology,  physiopathology*,  rehabilitation
Rest / physiology
Spinal Cord Injuries / complications,  physiopathology*,  rehabilitation
Thoracic Vertebrae
Young Adult

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

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