The University of Southampton
University of Southampton Institutional Repository

Effect of muscle tension on non-linearities in the apparent masses of seated subjects exposed to vertical whole-body vibration

Record type: Conference or Workshop Item (Paper)

In subjects exposed to whole-body vibration, the cause of non-linear dynamic characteristics with changes in vibration magnitude is not understood. The effect of muscle tension on the non-linearity in apparent mass has been investigated in this study. Eight seated male subjects were exposed to random and sinusoidal vertical vibration at five magnitudes (035–14 m/s2 r.m.s.). The random vibration was presented for 60 s over the frequency range 20–20 Hz; the sinusoidal vibration was presented for 10 s at five frequencies (315, 40, 50, 63 and 80 Hz). Three sitting conditions were adopted such that, in two conditions, muscle tension in the buttocks and the abdomen was controlled. It was assumed that, in these two conditions, involuntary changes in muscle tension would be minimized. The force and acceleration at the seat surface were used to obtain apparent masses of subjects. With both sinusoidal and random vibration, there was statistical support for the hypothesis that non-linear characteristics were less clear when muscle tension in the buttocks and the abdomen was controlled. With increases in the magnitude of random vibration from 035 to 14 m/s2 r.m.s., the apparent mass resonance frequency decreased from 525 to 425 Hz with normal muscle tension, from 50 to 438 Hz with the buttocks muscles tensed, and from 513 to 45 Hz with the abdominal muscles tensed. Involuntary changes in muscle tension during whole-body vibration may be partly responsible for non-linear biodynamic responses.

Full text not available from this repository.

Citation

Matsumoto, Y. and Griffin, M.J. (2000) Effect of muscle tension on non-linearities in the apparent masses of seated subjects exposed to vertical whole-body vibration At 2nd International Conference on Whole-Body Vibration Injuries. 07 - 09 Nov 2000. , pp. 41-42.

More information

Published date: 2000
Venue - Dates: 2nd International Conference on Whole-Body Vibration Injuries, 2000-11-07 - 2000-11-09
Organisations: Human Sciences Group

Identifiers

Local EPrints ID: 10470
URI: http://eprints.soton.ac.uk/id/eprint/10470
PURE UUID: 084ddde8-3462-4ad3-a0bc-b5f18969ca2b

Catalogue record

Date deposited: 12 May 2005
Last modified: 17 Jul 2017 17:06

Export record

Contributors

Author: Y. Matsumoto
Author: M.J. Griffin

University divisions


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

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×