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Start Over Author "Griffin, Michael" Journal international archives of occupational and environmental health
35 results on '"Griffin, Michael"'

34. Reduction in finger blood flow induced by hand-transmitted vibration: effect of hand elevation

Author

Michael J. Griffin, Marcella Mauro, Massimo Bovenzi, Ying Ye, Ye, Ying, Mauro, Marcella, Bovenzi, Massimo, and Griffin, Michael J. Griffin

Subjects
Adult, Male, medicine.medical_specialty, hand-transmitted vibration, Vibration, Fingers, Young Adult, hand elevation, Hand transmitted vibration, Internal medicine, hand-transmitted vibration, vibration-induced white finger, hand-arm vibration syndrome, finger blood flow, hand elevation, medicine, Humans, Hand-Arm Vibration Syndrome, finger blood flow, business.industry, Public Health, Environmental and Occupational Health, Elevation, Percentage reduction, Blood flow, Hand, Healthy Volunteers, Surgery, body regions, Regional Blood Flow, Cardiology, vibration-induced white finger, business
Abstract

Objectives This study investigated the effect of hand elevation on reductions in finger blood flow (FBF) induced by hand-transmitted vibration. Methods Fourteen males attended six sessions on six separate days, with a control sessions and a vibration session (125-Hz vibration at 44 ms 2 r.m.s.) with the right hand supported at each of three elevations: 20 cm below heart level (HL), at HL, and 20 cm above HL. Finger blood flow on the left and right hand was measured every 30 s during each 25-minute session comprised of five periods: (i) no force and no vibration (5 minutes), (ii) 2-N force and no vibration (5 minutes), (iii) 2-N force and vibration (5 minutes), (iv) 2-N force and no vibration (5 minutes), and (v) no force and no vibration (5 minutes). Results Without vibration, FBF decreased with increasing elevation of the hand. During vibration of the right hand, FBF reduced on both hands. With elevation of the right hand, the percentage reduction in FBF due to vibration (relative to FBF on the same finger at the same elevation before exposure to vibration) was similar on the middle and little fingers of both hands. After cessation of vibration, there was delayed return of FBF with all three hand heights. Conclusions Vibration of one hand reduces finger blood flow on both exposed and unexposed hands, with the reduction dependent on the elevation of the hand. The mechanisms responsible for vibration-induced reductions in FBF seem to reduce blood flow as a percentage of the blood flow without vibration. Tasks requiring the elevation of the hands will be associated with lower FBF, and the FBF will be reduced further if there is exposure to hand-transmitted vibration.

Published
2014

35. Assessment of thermotactile and vibrotactile thresholds for detecting sensorineural components of the hand-arm vibration syndrome (HAVS).

Author

Ye Y and Griffin MJ

Subjects
Adult, Aged, Fingers physiopathology, Hand-Arm Vibration Syndrome physiopathology, Humans, Male, Middle Aged, Occupational Diseases diagnosis, Temperature, Vibration, Hand-Arm Vibration Syndrome diagnosis, Mechanoreceptors pathology, Sensory Thresholds physiology, Thermoreceptors physiopathology
Abstract

Background: Thermotactile thresholds and vibrotactile thresholds are measured to assist the diagnosis of the sensorineural component of the hand-arm vibration syndrome (HAVS)., Objectives: This study investigates whether thermotactile and vibrotactile thresholds distinguish between fingers with and without numbness and tingling., Methods: In 60 males reporting symptoms of the hand-arm vibration syndrome, thermotactile thresholds for detecting hot and cold temperatures and vibrotactile thresholds at 31.5 and 125 Hz were measured on the index and little fingers of both hands., Results: In fingers reported to suffer numbness or tingling, hot thresholds increased, cold thresholds decreased, and vibrotactile thresholds at both 31.5 and 125 Hz increased. With sensorineural symptoms on all three phalanges (i.e. numbness or tingling scores of 6), both thermotactile thresholds and both vibrotactile thresholds had sensitivities greater than 80% and specificities around 90%, with areas under the receiver operating characteristic curves around 0.9. There were correlations between all four thresholds, but cold thresholds had greater sensitivity and greater specificity on fingers with numbness or tingling on only the distal phalanx (i.e. numbness or tingling scores of 1) suggesting cold thresholds provide better indications of early sensorineural disorder., Conclusions: Thermotactile thresholds and vibrotactile thresholds can provide useful indications of sensorineural function in patients reporting symptoms of the sensorineural component of HAVS.

Published
2018
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