Effect of hand-transmitted vibration on finger blood flow
Effect of hand-transmitted vibration on finger blood flow
Method: Three experiments were designed to examine variables likely to affect the accuracy of measuring FBF by venous occlusion plethysmography. In a further four experiments, FBF was measured before, during and after the application of a 2 N force and vibration at 16, 31.5, 63, 125, 250, and 315 Hz at acceleration magnitudes from 0 to 15 ms-2 r.m.s. Healthy male subjects were used in all experiments.
Results: In the first experiment in Chapter 4, FBF was found to be similar whether measured on a single finger or simultaneously on all five fingers of a hand.
Differences in FBF between two plethysmographs (Medimatic Digitmatic DM2000 and HVLab multi-channel plethysmograph) found in the second experiment in Chapter 4, were partially explained by the compensation for the resistances of the cables connected to the strain gauges.
The third experiment, in Appendix B, found no effect on FBF of whole-body vibration (1.0 ms-2 r.m.s. at 8 Hz or 4 ms-2 r.m.s. at 63 Hz) during or after vibration.
The experiments in Chapters 5 and 6 found that a 2 N push force applied to the finger reduced FBF in the exposed finger, compared to pre-exposure blood flow. However, a 2 N push force applied to one or two palms did not affect FBF in either hand.
With the effect of push force minimised in the experiments in Chapters 6 to 8 there was no difference in FBF between the exposed and the unexposed hand during or after exposure to vibration. Also, there was vasoconstriction without preliminary strong vasodilation after the end of exposure.
Vibration of two hands generally caused a similar vasoconstriction as vibration of one hand in Chapter 8.
The results are consistent with vibration activating centrally mediated vasoconstriction in both hands during and after vibration exposure. The mechanism controlling the vasoconstriction is dependent on the frequency and the magnitude of the vibration.
University of Southampton
Welsh, Alexandra Jane Lawson
fa82348b-ea7c-4e62-bd2b-3d0a8ff05759
2007
Welsh, Alexandra Jane Lawson
fa82348b-ea7c-4e62-bd2b-3d0a8ff05759
Welsh, Alexandra Jane Lawson
(2007)
Effect of hand-transmitted vibration on finger blood flow.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Method: Three experiments were designed to examine variables likely to affect the accuracy of measuring FBF by venous occlusion plethysmography. In a further four experiments, FBF was measured before, during and after the application of a 2 N force and vibration at 16, 31.5, 63, 125, 250, and 315 Hz at acceleration magnitudes from 0 to 15 ms-2 r.m.s. Healthy male subjects were used in all experiments.
Results: In the first experiment in Chapter 4, FBF was found to be similar whether measured on a single finger or simultaneously on all five fingers of a hand.
Differences in FBF between two plethysmographs (Medimatic Digitmatic DM2000 and HVLab multi-channel plethysmograph) found in the second experiment in Chapter 4, were partially explained by the compensation for the resistances of the cables connected to the strain gauges.
The third experiment, in Appendix B, found no effect on FBF of whole-body vibration (1.0 ms-2 r.m.s. at 8 Hz or 4 ms-2 r.m.s. at 63 Hz) during or after vibration.
The experiments in Chapters 5 and 6 found that a 2 N push force applied to the finger reduced FBF in the exposed finger, compared to pre-exposure blood flow. However, a 2 N push force applied to one or two palms did not affect FBF in either hand.
With the effect of push force minimised in the experiments in Chapters 6 to 8 there was no difference in FBF between the exposed and the unexposed hand during or after exposure to vibration. Also, there was vasoconstriction without preliminary strong vasodilation after the end of exposure.
Vibration of two hands generally caused a similar vasoconstriction as vibration of one hand in Chapter 8.
The results are consistent with vibration activating centrally mediated vasoconstriction in both hands during and after vibration exposure. The mechanism controlling the vasoconstriction is dependent on the frequency and the magnitude of the vibration.
Text
1069880.pdf
- Version of Record
More information
Published date: 2007
Identifiers
Local EPrints ID: 466238
URI: http://eprints.soton.ac.uk/id/eprint/466238
PURE UUID: 3f084fde-750c-43a6-b4ef-5fc01f6206a5
Catalogue record
Date deposited: 05 Jul 2022 04:54
Last modified: 16 Mar 2024 20:35
Export record
Contributors
Author:
Alexandra Jane Lawson Welsh
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics