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Omar Mian
06-26-2006, 07:36 PM
Dear Biomch-L subscribers,

During the sit-to-stand movement, the instant of lift off from the chair
(when the buttocks lose contact with the seat) is a key event. In the
absence of reaction force data obtained from the seat or beneath the chair,
kinematic data must be used to locate time of lift off. Can anyone alert me
to a study that has validated the use of a kinematic detection method
against a force based method?

I am aware that a number of (logical but arbitrary) kinematic methods have
been used by various researchers (e.g. instant when hip marker has risen 1cm
vertically, instant when thigh segment has rotated 2 degrees) but am yet to
come across a study that has demonstrated the accuracy of these kind of
approaches.

Thank you

Omar

Omar Mian PhD
Institute for Biophysical and Clinical Research into Human Movement,
Manchester Metropolitan University,
Hassall Road,
Alsager,
ST7 2HL,
United Kingdom

E-mail: O.Mian@mmu.ac.uk
Tel: +44 (0)161 247 5515
Fax: +44 (0)161 247 6375
Web: http://www.irm.mmu.ac.uk/

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