Final answer:
Repetition is not an exception; it is a confirmed risk factor for Cumulative Trauma Disorder. Carpal tunnel syndrome is the disorder most likely caused by the repeated use of a jackhammer. Padding a strained muscle is part of standard treatment because it supports the muscle and reduces further injury.
Step-by-step explanation:
The common job risk factors for the development of Cumulative Trauma Disorder (CTD) include repetitive motions, abnormal postures, excessive force, and mechanical compression. However, repetition is not an exception; it is one of the main risk factors for CTD. Therefore, all of the provided options (Excessive force, Abnormal postures, Mechanical compression, Repetition) are actual risk factors for the development of CTD.
The phrase 'repeated use of a jackhammer' suggests that the disorder likely to be caused by such activity is one that stems from repetitive motion and mechanical stress on the hands and arms. Of the provided options, Carpal tunnel syndrome would be the most likely disorder caused by this activity, as it is a condition that can occur with repetitive motions of the wrist, leading to nerve compression.
Padding of a strained muscle is a typical treatment because it provides support and reduces additional strain. This can help to minimize further injury and inflammation, allowing the muscle to heal more effectively.