Final answer:
Among the options provided, excessive vibration would likely be the incorrect choice for a back disorder risk factor, as it does not directly cause back disorders. Good posture and proper body mechanics are crucial in preventing back strain and related spinal disorders such as kyphosis, lordosis, and scoliosis. Therefore, the correct option is d.
Step-by-step explanation:
Among the listed choices, back disorder risk factors include all except Continued bending. This is a tricky question because continued bending is indeed a risk factor for back disorders, along with excessive vibration, prolonged sitting, and inappropriate body mechanics. However, if one option must be excluded, it should be remarked that 'continued bending' is commonly acknowledged as a risk factor, so if any one of these options is incorrect, it would likely be excessive vibration, since it is not directly related to causing a back disorder but more to overall body fatigue and injury. Good posture is key in preventing back strain because having the center of gravity (cg) directly above the pivot point in the hips and above the base of support at the feet minimizes the torque around the hips, thus reducing strain on the muscles. Issues like kyphosis, lordosis, and scoliosis are disorders related to abnormal curvatures of the spine and are often associated with poor posture over time. To prevent back disorders, it's recommended to maintain proper posture, avoid excessive bending, and use proper body mechanics, especially when lifting heavy objects.