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Strengthening programs can be used to strengthen weak antagonist muscles and the corresponding spastic agonists. In adolescents with cerebral palsy, 6 weeks of isokinetic exercise was shown to increase upper extremity movement time and torque.
The effects were greater for these patients than for a matched group of children who received repetitive practice with no resistive exercise and a control group with no intervention.
McCubbin JA, Shasby GB. Effects of isokinetic exercise on adolescents with cerebral palsy. Adapt Phys Act Q 1985;2:56-64.