A colleague and I have been researching the effect of vibration training
on neuromuscular output (EMG and joint moments).

When vibration is applied to the body, for example through the feet when
someone stands on a vibrating platform, the vibration signal travels
through the body from the feet to the head. Previous research has
clearly shown that the vibration signal (amplitude and frequency) is
attenuated as it travels through the body by both muscle activity (Nigg
and Liu, 1999) and the viscoelastic nature of biological tissues (Fung,
1993).

We are interested in knowing if the vibration signal changes in any
other way as it travels through the body. **Do you know, for example, if
the signal becomes more noisy the more tissues it travels through, i.e
as it travels through the foot, through the lower leg, through the upper
leg etc?** Has anyone undertaken research that has addressed this
specific question, or is aware of any such research? We are interested
in this because the muscle spindle gamma gain (often inappropriately
referred to as muscle spindle sensitivity) is affected more by a noisy
vibration signal than a 'clean' vibration signal (Cordo et al. 1996,
Nature 383 p769-770).

Many thanks

Dr Kieran Moran

--
Dr Kieran Moran
Biomechanics Research Group
School of Health and Human Performance
Faculty of Science and Health
Dublin City University
Collins Avenue
Dublin 9

tel; 00 353 1 700 8011
fax: 00 353 1 700 8888

kieran.moran@dcu.ie