1. Old adults often show heightened antagonist muscle coactivation during goal directed movement. 2. If a motion is reversed, agonist and antagonist muscles switch roles. 3. This excitatory interneuron innervates the alpha motor neuron that controls the antagonist muscle . 4. When the agonist muscle is inhibited from contracting, the antagonist muscle contracts. 5. There are co-contractions of antagonist muscles . 6. Electrical stimulation to the antagonist muscles or vibrations has also been used with some success. 7. A small device that can help in developing the antagonist muscles to those used while gripping with the hand. 8. In others, a botulinum toxin injection into an extraocular muscle is accompanied by a bupivacaine injection into the antagonist muscle . 9. The interposed nucleus is responsible for coordinating agonist / antagonist muscle pairs, and therefore a lesion in this area causes tremor. 10. If bupivacaine injection is combined with a small dose of botulinum toxin in the antagonist muscle , eye deviation during regeneration is minimized.
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