Lifting and Carrying Objects The weight to be lifted from the ground should be located close to the lifters spread feet; the lifter squats, keeping the trunk as erect as possible. The actual lifting should be accomplished by the legs rather than the spine or arms. Proper lifting is begun by moving the trunk to a position as perpendicular to the floor as possible and then tilting the pelvis backward and keeping the abdominal muscles activated; the knee extensors along with the hip extensors then act concentrically. The lift should be slow, not jerky. Insufficient leg strength can result in incorrect lifting. The weight should be carried close to the body, with the trunk assuming a position that allows the line of gravity to fall well within the area of the base. The trunk lateral flexors are more active when the weight is carried on one side, the extensors are more active when the weight is in front, and the abdominals are more active when the weight is carried across the top of the back, as in backpacking.
Posted on: Tue, 08 Oct 2013 05:46:47 +0000
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