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Effects of plantar stimulation on cardiovascular response to orthostatism

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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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Correspondence to Marc-Antoine Custaud.

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The authors declare that they have no conflict of interest.

Ethical approval

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.

Additional information

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

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