[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.

[Reaction to decreased circulating blood volume in persons subject and resistant to motion sickness (airsickness)]. / Reaktsiia na umen'shenie ob"ema tsirkuliruiushchei krovi u liudei, podverzhennykh i rezistentnykh k bolezni dvizheniia (ukachivaniiu).

The study of 54 healthy male test subjects demonstrated significantly different responses of motion sickness susceptible and resistant people to 10-minute occlusion of their femoral veins. The changes in limb rheograms, as well as heart rate and stroke volume indicated that in motion sickness susceptible subjects the circulating blood volume in the upper body decreased, whereas in motion sickness resistant subjects it remained unaltered or increased in response to the occlusion.

[Reaction to physical load in persons with a varying vestibular-autonomic resistance]. / Reaktsiia na fizicheskuiu nagruzku u liudei s razlichnoi vestibulo-vegetativnoi ustoichivost'iu.

The level of vestibular stability (tolerance to the double rotation test according to I. I. Bryanov) was compared with the pattern of changes in the heart rate and arterial pressure during exercise tests (20 squatting per 30 sec). The test subjects were 136 healthy male volunteers--representatives of different professions, aged 21--40. The subjects with high vestibular stability showed greater changes in heart rate (+29%) and a relatively stable diastolic pressure. The subjects with low vestibular stability displayed, on the contrary, greater changes in the diastolic (-9%) and pulse (+71%) pressure and a relatively low increase in heart rate. The time of recovery of the pressure level was significantly longer in the susceptible people. The possibility of predicting vestibular tolerance on the basis of responses to exercise tests was explored. Mathematical formulas of the theory of image recognition were used to develop a rule that makes it possible to identify 84.4% subjects with low vestibular stability in a given group.