The clinical measurement of strength

environment&dquo;, is an obvious prerequisite to normal human function. If the strength measurements used by clinicians are to be relevant to -practice, they must fulfil at least four criteria: (1) they must be sensitive enough to distinguish subnormal from normal muscle strength; (2) they should be precise enough to document both increases and decreases in strength; (3) they should be reliable; (4) they should be predictive of other variables of potentially greater importance. The purpose of this paper is to review existing knowledge relevant to clinical strength testing. Because only instrumented strength tests fulfil the above four criteria, they will be emphasised in this review. The precision, sensitivity and reliability of instrumented strength tests, the instruments used, the patients to whom the instruments have been applied, and the predictive value of instrumented strength tests will be considered.

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