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Table 1 Medical research council grading of muscle strength

From: Physiotherapy for poliomyelitis: a descriptive study in the Republic of Congo

Grade 0 No movement is observed
Grade 1 Only a trace or flicker of movement is seen or felt in the muscle, or fasciculation is observed
Grade 2 Movement is possible only if the resistance of gravity is removed
Grade 3 Movement against gravity is possible but not against resistance of the examiner
Grade 4 Muscle strength is reduced but muscle contraction can move joint against gravity and resistance
Grade 5 Muscle contracts normally against full resistance