Dear Matt,
A safe load limit relative to body weight has not been established.It is
difficult as the number of variables is so great. However carrying over
40% of bodyweight is excessive even for short periods.
A recent article by Pascoe D. et al (1997) Influence of carrying book bags
on gait cycle and posture of youths in Ergonomics 24 , 1 , 1 - 14 may be a
useful starting point.
Hope this is of some help
Sara Dockrell
Lecturer in Physiotherapy
Trinity College
Dublin
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