Journal of Applied Physiology
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J Appl Physiol (May 17, 2002). doi:10.1152/japplphysiol.00142.2002
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Articles in PresS, published online ahead of print May 17, 2002
J Appl Physiol, 10.1152/jap.00142.2002
Submitted on February 25, 2002
Accepted on May 14, 2002

Muscle activity damps the soft-tissue resonance which occurs in response to pulsed and continuous vibrations

James M Wakeling1*, Benno M Nigg1, and Antra I Rozitis1

1 Department of Kinesiology, University of Calgary, Calgary, Alberta, Canada

* To whom correspondence should be addressed. E-mail: wakeling{at}kin.ucalgary.ca.

This study tested the hypotheses that when the excitation frequency of mechanical stimuli to the foot was close to the natural frequency of the soft-tissues of the lower extremity then the muscle activity increases (i) the natural frequency and (ii) the damping in order to minimize resonance. Soft-tissue vibrations were measured with tri-axial accelerometers and muscle activity measured using surface EMG from the quadriceps, hamstrings, tibialis anterior and triceps surae groups from 20 subjects. Subjects were presented vibrations whilst standing on a vibrating platform. Both continuous vibrations and pulsed bursts of vibrations were presented, across the frequency range of 10 to 65 Hz. Elevated muscle activity and increased damping of vibration power occurred when the frequency of the input was close to the natural frequency of each soft-tissue. However, the natural frequency of the soft-tissues did not change in a manner that correlated with the frequency of the input. It is suggested that soft-tissue damping may be the mechanism by which resonance is minimized at heel-strike during running.




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