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Proceedings Paper

High speed ultrasound monitoring in the field of sports biomechanics
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Paper Abstract

Ultrasonic monitoring allowing the evaluation of the performance of muscles under training has been developed. The monitoring scheme is suitable to determine muscle movement and is based on the measurement of the transit time of longitudinally polarized ultrasound propagating across the observed muscle. Variations of the length of the muscle lead to variations of the lateral extension since the volume of the muscle is conserved. The corresponding variations of the observed time-of-flight result dominantly from the variation of the path length. This allows the time-resolved detection of the movement of the muscles in the path of the ultrasonic beam. In this way not only the degree of contraction or relaxation, but also the speed of these processes can be quantitatively monitored. The muscle thickness has been determined with a resolution of ± 0.02 mm corresponding to about ± 0.2 % of the thickness of the relaxed muscle. This resolution is already in the range of unavoidable uncertainties caused by the surface structure of the individual muscles. Similarly, the already obtained resolution in time corresponds to a fraction 1/750 of the time of the fastest known human muscle movement of 7.5 ms, observed for the full contraction of the eye lid muscle. The time of flight is measured along a line between two electro-acoustic transducers positioned on the skin on opposite sides of the monitored muscle. The transducers can be placed at any desired position but should be positioned such, that no bones or intestines are obstructing the path between them. The time-of-flight from which all other data is derived is observed with the aid of a computer-controlled arbitrary function generator and a synchronized transient recorder. Even in the demonstrated developmental state the equipment is already rather compact (lap-top size) and can be battery operated.

Paper Details

Date Published: 21 April 2008
PDF: 8 pages
Proc. SPIE 6935, Health Monitoring of Structural and Biological Systems 2008, 693523 (21 April 2008);
Show Author Affiliations
M. Zakir Hossain, Univ. of Leipzig (Germany)
Bangladesh Sports Education Institute (Bangladesh)
E. Twerdowski, Univ. of Leipzig (Germany)
W. Grill, Univ. of Leipzig (Germany)

Published in SPIE Proceedings Vol. 6935:
Health Monitoring of Structural and Biological Systems 2008
Tribikram Kundu, Editor(s)

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