Abstract
We assessed the influence of vestibular stimulation by whole-body oscillation in the yaw plane on the cardiorespiratory responses after a change of posture from sitting to standing. Eighteen healthy subjects (21–70 years old) and six patients with bilateral vestibular loss (46–59 years old) were tested. For comparison, a subgroup, age matched to the patients, was created from the healthy group. After a 10-min rest, subjects who were sitting, back unsupported, stood on a platform affording en bloc head and body support. The platform was either static or oscillated at 0.1 Hz and 0.5 Hz (20° amplitude) for 2 min. Presentation of the three conditions was counterbalanced. Respiration, ECG, blood pressure and head position were recorded. During oscillation at 0.5 Hz, the respiratory responses were different between groups; healthy subjects showed a significant increase of the respiratory frequency (1.75±2.1 breaths/min), which was not observed in the patients (0.16±0.7 breaths/min) (p<0.05, ANOVA). Absolute changes of heart rate and blood pressure were similar for the three conditions in all the subjects. However, healthy subjects showed a decrease of power spectrum density of the high-frequency ('respiratory') component of heart rate variability on standing during all three conditions. This response was variable among the patients and the age-matched group. The study shows that semicircular canal activation influences the respiratory rhythm during movements in the yaw plane in standing subjects. In addition, we observed that changes of the respiratory influence on heart rate variability during orthostatic stress are not affected by yaw oscillation or chronic vestibular loss, but may be affected by factors related to age.
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K.J.R. was supported by grants from the Instituto Mexicano del Seguro Social and Fundación Aventis.
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Thurrell, A., Jáuregui-Renaud, K., Gresty, M.A. et al. Vestibular influence on the cardiorespiratory responses to whole-body oscillation after standing. Exp Brain Res 150, 325–331 (2003). https://doi.org/10.1007/s00221-003-1422-8
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DOI: https://doi.org/10.1007/s00221-003-1422-8