[Vestibular nystagmus in rats after hypokinesia and prolonged rotation].

Changes in the latent period, number of beats, duration and frequency of the nystagmus were investigated in rats exposed to angular acceleration of an increasing value (10, 20, 30, and 40 degree/cm2) after a 21-day exposure to hypokinesia per se or hypokinesia in a rotating device (with a radius of 141 cm, rate of rotation of 33.3 rpm, and acceleration value of 2 g). The hypokinetic rats showed nystagmic changes only with the lowest acceleration used (10 degrees/cm2).

[Semicircular canal function following a flight aboard biosatellite "Cosmos-936"].

The nystagmic reflex, latent period, total and mean number of events, and their duration were measured in the rats flown for 18.5 days aboard the biosatellite Cosmos-936 under the conditions of weightlessness and artificial gravity. The studies demonstrated that prolonged weightlessness did not influence the receptor formations and centers of semi-circular canals.

[Characteristics of vestibular nystagmus in rats].

As a result of experiments on Wistar, Wistar-SPF and mongrel rats, the duration, number of beats and frequency of nystagmus in response to progressively increasing acceleration of 10, 20, 30 and 40 deg/sec2 for 3 sec at each step were determined. These parameters were found to increase with a rise in acceleration, the rate of increase being gradually slowed down (the slope of the curves decreased). The number of beats and the duration of the nystagmus in the Wistar and mongrel rats were identical and significantly higher (P less than 0.

[Human tolerance to Coriolis acceleration during exertion of different muscle groups].

The effect of an arbitrary loading of different muscle groups (shoulder, back, legs) and motor acts on the tolerance to Coriolis accelerations was investigated in 140 experiments in which 40 test subjects participated. The accelerations were cumulated and simulated by the Bryanov scheme. Muscle tension was accompanied by a less expressed vestibulo-vegetative reaction and shortening of the recovery period after the development of motion sickness symptoms.