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  • Title: Evaluation of key points in the sit-to-stand movement using two force platforms.
    Author: Chang CS, Leung CY, Liou JJ, Tsai WW.
    Journal: Percept Mot Skills; 2010 Oct; 111(2):496-502. PubMed ID: 21162451.
    Abstract:
    Three key points of the sit-to-stand (STS) movement were confirmed as aspects of the ground reaction force (GRF): the onset, maximum GRF, and seat-off. 46 healthy subjects (M age = 22.2 yr., SD = 4.4) participated. During the STS movement, two vertical force platforms were used to measure the resultant GRF, defined as the whole-body force, and its two components, the buttock and leg GRFs. The onsets of the component GRFs identified the sequence of the important time points in the STS movement more precisely than the onset of the resultant GRF. Data showed that the maximum whole-body GRF, the maximum GRF of both legs, and seat-off appeared in sequence and not simultaneously.
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