What is a common limitation of manual strength testing?

• A. Findings largely subjective; the examination can have limited value if you are relatively small in stature and are testing a large muscle group in a tall, strong athlete.
• B. It is not affected by tester strength.
• C. It always provides objective data.
• D. It is unaffected by body size.

Answer: (A)

Manual strength testing relies on the examiner’s judgment about how much resistance a patient can overcome, so the results are inherently subjective. The tester must apply force and gauge the patient’s effort, which means the findings can vary with who is performing the test. This becomes especially limiting when the tester is smaller or weaker than the person being tested or when a large muscle group is tested in a tall, strong athlete—the tester may not be able to provide enough resistance, leading to underestimation or inconsistent results. Because of this, manual testing isn’t fully objective and body size or the tester’s strength can influence the outcome. In practice, clinicians recognize this limitation and may use comparison with the other limb, standardized techniques, or objective devices when available to improve reliability.