Abstract
Purpose
Impaired leg arterial stiffness (pulse wave velocity, PWV) and vasodilatory function are found after stroke. Acute passive vibration (PV) decreases leg PWV (legPWV) and pressure wave reflection (aortic augmentation index, aAIx) in healthy men. Our objective was to evaluate the effects of acute PV on aAIx and PWV in the paretic and non-paretic sides in stroke survivors.
Methods
Eleven stroke survivors (4 females) were randomized to either no-PV (control) or PV (25 Hz and 2 mm amplitude) trials on two separated visits. Following 20 min of supine rest with legs on a vibration platform, blood pressure, PWV, and aAIx were gathered before 10 continuous minutes of control or PV. Measurements were repeated at post-5, post-15, and post-30 min after control or PV.
Results
LegPWV and brachial-ankle PWV (baPWV, systemic stiffness) in paretic and non-paretic sides along with aAIx were significantly (P < 0.05) decreased from baseline at post-5 min after PV compared with control. At post-15 min, paretic and non-paretic legPWV remained significantly lower than baseline, but only non-paretic legPWV was different from control. We noted correlations between changes in paretic legPWV and changes in paretic baPWV (r = 0.47, P = 0.028) and aAIx (r = 0.51, P = 0.017) at post-5 min.
Conclusions
Acute PV applied to the legs of stroke survivors reduces systemic arterial stiffness and aortic wave reflection due to a reduction in leg arterial stiffness, which last longer in the non-paretic than in the paretic leg.
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Abbreviations
- PWV:
-
Pulse wave velocity
- baPWV:
-
Brachial-ankle pulse wave velocity
- aorticPWV:
-
Aortic pulse wave velocity
- legPWV:
-
Leg pulse wave velocity
- aAIx:
-
Aortic augmentation index
- AIx:
-
Augmentation index
- WBVE:
-
Whole-body vibration exercise
- PV:
-
Passive vibration
- BP:
-
Blood pressure
- DBP:
-
Diastolic blood pressure
- Control:
-
No passive vibration
- HR:
-
Heart rate
- ECG:
-
Electrocardiogram
- SBP:
-
Systolic blood pressure
- PP:
-
Pulse pressure
- P1:
-
Aortic pressure wave composed of a forward wave
- P2:
-
Aortic pressure wave composed of a reflected wave
- aAIx@75:
-
AIx normalized to a heart rate of 75 bpm
- Tr:
-
Time of reflection
- BMI:
-
Body mass index
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Acknowledgments
We thank Dr. Jacob VanLandingham, Sheree Porter, Tallahassee Memorial Hospital’s Stroke Wellness Group, Mrs. Nimmons, Aphasia Communication Group at FSU’s Department of Communication Disorders, Mary Gebel and Stroke Support Group for help with subject recruitment. We also thank Power Plate International for providing the vibrating platforms. We are grateful to our participants.
Conflict of interest
The authors declare no conflict of interest.
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Communicated by David C. Poole.
Clinicaltrial.gov register, NCT01841840.
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Koutnik, A.P., Wong, A., Kalfon, R. et al. Acute passive vibration reduces arterial stiffness and aortic wave reflection in stroke survivors. Eur J Appl Physiol 114, 105–111 (2014). https://doi.org/10.1007/s00421-013-2756-y
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DOI: https://doi.org/10.1007/s00421-013-2756-y