[Reaction to physical load in persons with a varying vestibular-autonomic resistance]

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.