Answer :

Final answer:

Heavy and tractor-trailer truck drivers have a high incidence of ergonomic injuries due to the demanding physical conditions of their work, including long hours of sitting and repetitive movement, exposure to noise and extreme weather conditions, and the physical stress caused by vehicle vibrations.

Explanation:

Heavy and tractor-trailer truck drivers have high incidence rates for ergonomic injury due to several factors. The demanding and monotonous nature of their work requires long hours of sitting in a fixed position, continuous exertion of pressure on the pedals, and repetitive movements of the arms and hands while steering, all factors highly related to ergonomic injuries. Additionally, the vibrations transmitted through the seats of these vehicles can induce musculoskeletal disorders.

Mechanized labor can take a toll on workers' health, and that is especially true for truck drivers. Injuries are common due to constant physical exertion in unfavorable circumstances. Similar to effects seen in factories, constant noise can also lead to hearing loss. In addition, long hours of work can cause fatigue and increase the risk of accidents.

Like laborers in factories, truck drivers are also constantly exposed to extreme weather conditions, both hot and cold, which can exacerbate health risks. For example, extended exposure to high summer temperatures, combined with the heat generated by the engine, can cause dehydration and heat exhaustion.

Thus, the physical demands and working conditions often related to jobs like heavy and tractor-trailer truck driving can lead to a higher incidence of ergonomic injuries.

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