Biomedical Engineering Reference
In-Depth Information
The results, in general, have shown that PD models can be relied upon to real-
istically predict human walking motion and GRF. They also indicate the potential
of future contributions of these models to the area of human biomechanics.
9.6 Validation of box-lifting task
9.6.1 Lifting task description
Subjects were instructed to stand in a neutral position, referred to as the T-pose
( Figure 9.3 ), which corresponds to the initial joint angles and segment locations
of the skeleton. It is well known that subjects may use different lifting strategies
depending on their strength and their perception of the load ( Bartlett et al., 2007 ;
Li and Zhang, 2009 ). In this work, participants were aware of the weight of the
box (20 lb for males and 15 lb for females) and were shown proper material-
lifting strategies to avoid any unexpected harmful strategies. They were then
instructed to lift a box from the standing surface to shoulder height in their most
natural or comfortable way ( Burgess-Limerick et al., 1995 ). Adequate warm-up
and rest time was allotted. Figure 9.14 shows the initial (left picture) and final
(right picture) lifting postures.
FIGURE 9.14
Initial and final lifting postures and the input parameters for the predicted box-lifting task
(d1, d2, h1, and h2).
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