Abbildung 1: Model demonstrating resistive exercise, with weighted backpack in place.
The exercise involves lifting a prescribed weight (10 repetitions with prescribed
weight), with each contraction lasting 5 seconds and followed by 5 seconds of rest.
Abbildung 2: Model showing positioning for measurement of maximum isometric
strength of the back extensors with use of a dynamometer and with the lumbar spine
in the neutral position to avoid lumbar flexion or hyperextension.