A great difference in muscle strength between muscles being tested (e.g. right and left deltoids) may indicate a current or past injury to the weaker deltoid muscle.
Muscle testing started in the United States during the early 1900s. It was first used on patients with infantile paralysis or polio. Since then, many studies have been conducted on the reliability and validity of manual muscle testing.
Successful muscle testing depends on the skill of the clinician. It is not enough that you learn about the procedures. You must master the techniques!
More on Manual Muscle Testing
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