How accurate is muscle strength testing?

Manual muscle testing is considered to be of “good reliability” with “good external and internal validity” (1).  These screens are semi-quantitative with each test receiving a score from 0-100+.

Muscle strength testing is available using sophisticated equipment that is substantially more accurate and gives strength measurements in pounds of force at each arc of the joints range of motion.  While this type of testing is more accurate, it is limited on the number of muscles that can be tested and takes substantially more time and money to perform.

1 – http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1847521/

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