Romberg balance test

Divided attention psychophysical tests. Four tests that measure motor control, balance, and the ability to count and estimate time. The tests include (a) walk-and-tum test, in which the subject has to walk heel-to-toe along a line, 9 steps in each direction (b) one-leg-stand test, in which the subject has to stand on one leg, keep both arms at the sides of the body, and coimt for 30 seconds, and then repeat the process while standing on the other leg (c) Romberg balance test, in which the subject has to stand straight with the eyes closed for an estimated 30 sseconds and (d) finger-to-nose test, in which the subject has to touch the nose widi a finger six times while the eyes are closed and the two hands are outstretched to the sides. 

Human volunteers exposed to PGDN at various concentrations of also exhibited central nervous system effects (Stewart et al. 1974). At 0.35 ppm, the VER was altered, particularly at 8 h. This effect became more pronounced at 0.5 ppm and 1.5 ppm, after 45-90 min at the latter concentration. After 6.25 h of exposure at 0.5 ppm, two subjects had abnormal heel-to-toe balance tests with their eyes closed, and after 8 h, all three subjects had abnormal modified Romberg tests as well as abnormal heel-to-toe tests with eyes closed. At this time, one subject was unable to perform the heel-to-toe test with open eyes. 

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