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Therefore, the observed changes in the DL, vibration sense in both feet bilaterally, Benton visual memory test score, and depression and fatigue in the POMS test that were noted in 1999 workers are considered to be due to exposure to 1-BP.
(b) One worker felt no vibration sense in the right foot.
For variables with right skewed distributions: vibration sense, proprioception, vestibular function (as measured by all three tests), quadriceps strength, reaction time and sway, logs of the variables were analysed.
All four visual measures, touch, vibration sense, performance in the Vestibular X Writing Test, quadriceps and ankle dorsiflexion strength and reaction time were significantly associated with all five gait parameters.
Examination showed that 52% had absent ankle reflexes, 44.0% had reduced or absent vibration sense and 4% were clinically normal in the study group.
The sensory and motor tests included three visual tests: high and low contrast visual acuity and contrast sensitivity; three tests of sensation in the leg - touch thresholds at the ankle, vibration sense at the knee and a test of proprioception; two tests of vestibular function - the vertical X writing test and a test of vestibular optical stability; and quadriceps strength.
Vibration sense was measured using an clectronic device capable of generating a 200 Hz vibration of varying intensity.
In any case, resolution of motor blockade should occur when vibration sense returns to the baseline after neuraxial blockade.
Evaluation of vibration sense was traditionally done by a non-graduated 64 Hz tuning fork, but unfortunately it does not provide the degree of dysfunction quantitatively.
Compared with those still residing at the hostel, those transferred to a nursing home had reduced visual contrast sensitivity, reduced touch and vibration sense in the lower limbs, weak quadriceps and ankle dorsiflexion strength, slow reaction times, and reduced stability as indicated by increased sway in all four test conditions and poor performances in the tests of static and dynamic balance (partial [X.sup.2] = 10.9, df = 2, p = 0.004 and partial [X.sup.2] = 12.6, df = 4, p = 0.014, respectively).
Table 4 After 30 minutes of administration of epidural block vibration sense was assessed over medial malleolus by tuning fork.