CDC defines loading and unloading a truck as how many METS?

The correct answer is based on the classification of physical activities as defined by the CDC (Centers for Disease Control and Prevention) in terms of METs (Metabolic Equivalent of Task). Loading and unloading a truck involves a significant amount of physical exertion, which includes lifting, pushing, and maneuvering heavy items.

In this context, 6 METs indicates a moderate to vigorous level of physical activity. This classification reflects the energy expenditure associated with these tasks, considering factors such as the weight of the items handled, the frequency of lifting, and the overall intensity of the work involved. Activities at this MET level can elevate heart rate and engage multiple muscle groups, making it a representative estimate for the energy required in loading and unloading a truck.

While other MET values like 4 METs, 5 METs, and 8 METs also correspond to different levels of physical activities, they do not accurately reflect the intensity involved specifically in the tasks of loading and unloading. As such, the determination of 6 METs by the CDC aligns well with the physical demands of this work.