![]() A number of grading systems exist for manual muscle testing (Table 1). Following the manual muscle test, the muscle tested is said to be "weak" or "strong" based upon the muscle's ability to resist the externally applied force over time. ![]() Whichever testing method is used, the resistance should be applied and released gradually to give the patient sufficient time to offer resistance. The handheld devices used in dynamometry can help quantify the "breaking force" necessary to depress a limb held in a specific position by the patient. The isometric hold (break test) shows the muscle to have a higher test grade than the resistance given throughout the range (make test). The results of the strength testing differ depending on the method used. Resistance applied throughout the range is termed a 'make test'. ![]() Resistance applied at the end of the tested range is termed a 'break test'. When performing strength testing a particular muscle or muscle group is first isolated, then an external force is applied.
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