[Characteristics of motion sickness during prolonged otolith stimulation in anti-orthostatic position]. / Osobennosti techeniia bolezni dvizheniia pri dlitel'noi otolitovoi stimuliatsii v antiortostaticheskom polozhenii.

Thirty healthy volunteers were tested for an extended period of time (up to 4 hours) on modified parallel swings during a head-down tilt (-8 degrees) study. The pattern of motion sickness that developed in this situation was evaluated in terms of physiological parameters (electrocardiography, rheoencephalography, arterial pressure, respiration rate electrooculography, etc.), hormonal status, fluid-electrolyte balance, sensory function. The test subjects developed a vestibulo-hemodynamic syndrome that included vestibular disorders, spatial illusions, fluid displacement in the cranial direction, excitation of the hypothalamic-pituitary-adrenal system, changes in fluid-electrolyte balance. The resulting data may help better understand mechanisms underlying motion sickness.

[Effect of the orientation of the head in the gravitational field on the intensity of caloric nystagmus]. / Vliianie orientatsii golovy v gravitatsionnom pole na intensivnost' kaloricheskogo nistagma.

The relationship between the intensity of the vertical and horizontal caloric nystagmus and the head orientation in the gravity field was studied experimentally. The positions in which the nystagmus reached the highest intensity were identified. The experimental results showed that during caloric stimulation the major contribution to the excitation of semi-circular canals was made by the convective flow of the endolymph which was dependent on the head orientation relative to the acceleration vector. The caloric tests can induce stimulation of vertical semi-circular canals which is comparable to that of horizontal canals in its strength.