Involved limbs may experience a temporary increase in tone after resistance training the affected (spastic) or non-affected side. This should dissipate soon after the exercise session is completed.
Occasionally, the person may experience muscle spasms. These are often transient and should not present a problem in resistance training routines unless they are occurring often. They can often be stopped by placing the limb (arm or leg) in an extended position.
Avoid quick movements that may increase spasticity or cause a muscle spasm. Slow, controlled movements are often best in avoiding increases in spasticity or muscle spasms.
Most experts recommend that high-intensity training be avoided in spastic muscle groups.
When training spastic muscle groups, emphasize slow and fluid movements within the person's capability. It may be impossible for some clients to move the limb in a completely smooth fashion due to high levels of spasticity.
To improve or maintain muscle balance between flexors and extensors, strengthen muscle groups that oppose the spastic muscle. For example, if the biceps have a high level of spasticity, work on strengthening the triceps.
Remember: tight muscle groups (spastic) are not necessarily strong and also need to be strengthened.