Attachments are only available to registered users.
As you relisted this question I would like to try to help you here. Body mechanics in lifting is a HUGE issue for nurses and nurses aides.
As for the weight, the weight of the patient isn't changed if you lift with improper body mechanics, but you will, by lifting improperly, feel that weight far more in places that may be damaged. Thats why lifting with your legs and not your back is taught; if you use your back to lift a patient, that places allot of strain on the spine. The muscles of the legs and thighs, however, can absorb this weight and work with it far more readily and with less risk of injury.
Using lifts such as a hoyer lift takes away lots of the risk to you as the lift does the heavier work. If poor body mechanics are used, it can make the weight seem heavier. And the muscles that bear that weight would be affected. Poor body mechanics place more weight on muscles and areas that carry a greater risk for damage; good body mechanics place that weight and stress on areas that are better suited for lifting, carrying, pushing and pulling.
I hope I was able to help and clarify,