The journal of spinal cord medicine · 2012
Effects of compression stockings on sympathetic activity and heart rate variability in individuals with spinal cord injury.
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Rimaud Diana, Calmels Paul, Pichot Vincent, Bethoux Francois, Roche Frederic
Аннотация
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.
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.