Abstract
Purpose
Walking is a complex locomotor process that involves both spinal cord reflexes and cortical integration of peripheral nerve input. Maintaining an upright body position requires not only neuromuscular activity but also cardiovascular regulation. We postulated that plantar mechanical stimulation might modulate autonomic nervous system activity and, thereby, impact blood pressure adaptation during standing.
Methods
Twelve healthy subjects underwent three randomly ordered 45-min 70°-saddle tilt tests while the plantar surfaces of the feet were stimulated using specially engineered Korvit boots in the following modes: (1) no stimulation, (2) disrupted stimulation, and (3) walking mode. Orthostatic tolerance time was measured for each trial. During testing, we obtained an electrocardiogram and measured blood pressure, skin blood flow, and popliteal vein cross-sectional area. We estimated central hemodynamics, baroreflex sensitivity and heart rate variability.
Results
Orthostatic tolerance time was not found to differ significantly between test conditions (37.2 ± 10.4, 40.9 ± 7.6, and 41.8 ± 8.2 min, for no stimulation, disrupted stimulation, and walking mode, respectively). No significant differences between treatment groups were observed for stroke volume or cardiac baroreflex sensitivity, both of which decreased significantly from baseline during tilt testing in all groups. Cardiac sympathetic index and popliteal vein cross-sectional area increased at the end of the tilt period in all groups, without significant differences between treatments.
Conclusions
Plantar mechanical stimulation is insufficient for immediate modulation of cardiac sympathetic and parasympathetic activity under orthostatic stress.
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Abbreviations
- ANOVA:
-
Analysis of variance
- BP:
-
Blood pressure
- CNES:
-
French national centre for space studies
- CO:
-
Cardiac output
- DBP:
-
Diastolic blood pressure
- ECG:
-
Electrocardiogram
- fMRI:
-
Functional magnetic resonance imaging
- HF:
-
High-frequency band (0.15–0.4 Hz)
- HR:
-
Heart rate
- HRV:
-
Heart rate variability
- LDF:
-
Laser-Doppler flowmetry
- LDFc:
-
Laser-Doppler flowmetry at the calf level
- LDFt:
-
Laser-Doppler flowmetry at the temple of forehead
- LF:
-
Low-frequency band (0.04–0.15 Hz)
- MEDES:
-
Institute for space medicine and physiology
- POTS:
-
Postural orthostatic tachycardia syndrome
- SBP:
-
Systolic blood pressure
- SBRs :
-
Spontaneous cardiac baroreflex sensitivity
- SI:
-
Sympathetic index
- SV:
-
Stroke volume
- TPR:
-
Total peripheral resistance
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Acknowledgments
This work was supported by the French “Centre National des Etudes Spatiales” (CNES) for the protocol “OrthoBoots”. Liubov E. Amirova received a doctoral grant from CNES and from the Institute for Space Medicine and Physiology (MEDES).
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.
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Communicated by Massimo Pagani.
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Amirova, L.E., Navasiolava, N.M., Bareille, MP. et al. Effects of plantar stimulation on cardiovascular response to orthostatism. Eur J Appl Physiol 116, 2257–2266 (2016). https://doi.org/10.1007/s00421-016-3479-7
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DOI: https://doi.org/10.1007/s00421-016-3479-7