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Effects of compression stockings on sympathetic ac

Date:10/04/2014 20:00:52
Effects of compression stockings on sympathetic activity 
 
J Spinal Cord Med. 2012 Feb 4. [Epub ahead of print]
Effects of compression stockings on sympathetic activity and heart rate variability in individuals with spinal cord injury.
Diana R, Paul C, Vincent P, Francois B, Frederic R.
Abstract
OBJECTIVE:
To investigate whether wearing graduated compression stockings (GCS) could affect the sympatho-adrenergic and heart rate variability (HRV) responses at rest and after a strenuous wheelchair exercise in individuals with spinal cord injury (SCI).
DESIGN:
Crossover trial.
SETTING:
Department of Physical Medicine and Rehabilitation, Saint Etienne, France.
PARTICIPANTS:
Nine men with SCI (five with low paraplegia: LP, four with high paraplegia: HP).
INTERVENTIONS:
Two maximal wheelchair exercise tests: with and without GCS (21 mmHg).
MAIN OUTCOME MEASURES:
HRV measurements: high frequency (HF), low frequency (LF), and LF/HF ratio. Norepinephrine (NOR) and epinephrine (EPI), at rest and post-exercise. Secondary measures were: blood pressure, heart rate, maximal power output, oxygen uptake, stroke volume, cardiac output, at rest, during and after exercise.
RESULTS:
When wearing GCS: LFnu(wavelet-post) significantly increased and HFnu(wavelet-post) significantly decreased (P < 0.05) in SCI subjects, leading to an enhance ratio of LF(wavelet)/HF(wavelet) and a significantly increased in NOR(rest) (P < 0.05).
CONCLUSIONS:
GCS induces an enhanced sympathetic activity in individuals with paraplegia, regardless of the level of the injury. Enhanced post-exercise sympathetic activity with GCS may help prevent orthostatic hypotension or post-exercise hypotension.
 
 

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