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Ergonomics may be considered a vast subject with several branches encompassing the field. The three types of ergonomics may be physical ergonomics, cognitive ergonomics and organizational ergonomics. Physical ergonomics may be focused on the human body's responses to physical and physiological loads. Physical ergonomics might be concerned about risk factors that involve repetition, vibration, force and awkward or static posture relating to musculoskeletal disorders. Cognitive ergonomic most likely is not an exact science based on assumption of an unqualified third party. Organizational ergonomics may fall into the same assumption of an unqualified third party based on theories never proved. Physical ergonomics may be the most reliable system of preventing permanent injury on the job.
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