ABSTRACT
Introduction ....................................................................................................................................488 Relevant Tasks ...........................................................................................................................488 Interpretation of Results ............................................................................................................488 How Detailed Should the Analysis Be? .................................................................................... 489 Equipment Required.................................................................................................................. 489 Human Variability .....................................................................................................................490
Principles of Biomechanical Calculations .....................................................................................490 Moments and Lever Arms .........................................................................................................490 A Simple Example with a 2D Low-Back Model ...................................................................... 491 Moments in 3D Space ............................................................................................................... 492 Moments in Dynamic Tasks ...................................................................................................... 496
Prediction of Strength and Task Feasibility Using Moments ........................................................ 497 Reliability of Maximum Joint Strength Data ............................................................................ 497 Dependence of Joint Strength with Joint Angles ...................................................................... 498 Interpretation of Results ............................................................................................................ 498
Forces on the Low Back .................................................................................................................500 Guidelines from Low-Back Forces ...........................................................................................500
