The effects of finger force and visual distractions on the measurement of thermal perception thresholds.
Smutz-WP; Schopper-AW; Welcome-DE; Dong-RG; Andrew-ME
10th International Conference on Hand-Arm-Vibration, June 2004, Las Vegas, Nevada. 2004 Jun; :149-150
The thermal perception threshold (TPT) test has been used by several investigators to measure the decreased sensitivity of the mechanoreceptors in persons exposed to hand-transmitted vibration. The measurement of increased TPT at the fingertips is considered an alternative approach for the objective early detection of vibration induced sensorineural disorders, which may be the first sign of hand-arm vibration syndrome. An aesthesiometer is usually used to measure the TPT. The finger force required to keep the fingertip in contact with the temperature-controlled plate for the test has been either totally uncontrolled or controlled via visual feedback to a test subject. It is unclear whether the finger force should be controlled. If controlled with visual feedback, the test subjects may become distracted by having to watch the force meter during the test and this might adversely affect the assessment of the thermal threshold. To improve the test method, the specific aim of this study was to test the hypotheses that (a) the method for controlling finger force during the test would affect the magnitude of the TPT's, and (b) that variation in finger force levels would affect the magnitudes of the TPTs.
Hand-injuries; Hand-protection; Vibration-exposure; Vibration-disease; Vibration-effects; Arm-injuries; Sensitivity-testing; Exposure-assessment
10th International Conference on Hand-Arm-Vibration, June 2004, Las Vegas, Nevada