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critical analysis of the report Case Study

Category: Logic & Programming Pages: 4 Type: Case Study Level: High School
8–second test; (2) Center frequency, which is the average frequency of acceleration in the test band, so that 50% of the energy that drives the tremor is produced at frequencies above the center frequency and 50% is produced below; (3) Tremor Index, calculated for each hand from five parameters (e.g., tremor intensity, center frequency, standard deviation of the center frequency, harmonic index, and standard deviation of the harmonic index.); and (4) Combined index for both hands (NIOSH Health Hazard Evaluation Report, Yellow Stone Park, 2001). This test measures the vibrations experienced by the rangers in riding the snowmobiles and the intensity of the vibration that will likely cause the musculoskeletal disorder. The third test used is the Vibroactile Sensitivity test. This test was selected to determine the effect of the hand–arm vibration produced by snowmobiles on vibration perception thresholds. The test device used was the Bruel & Kj?r Model 96–27 Vibrometry System. This fully automated system produces a mechanical stimulus (sinusoidal vibration) at a chosen frequency to the pulp of a finger tip; the participant indicates perception of the vibration by means of a hand–held button similar to that used in a hearing test. The software was configured to test vibration at four frequencies: 31.5 Hz, 125 Hz, 250 Hz, and 500 Hz. Participants placed their right arm on an ascending armrest with the palm lying open on a circular pad, allowing the fingers to hang freely above the vibrating post. The test finger was then placed on the vibrating post with the finger slightly curved and resting lightly on the post. Participants controlled the intensity of vibration with the hand–held button, tracking back and forth between levels of stimulus perception and