It results from lack of input from the brain that quells muscle responses to stretch reflexes .
Spasticity , the uncontrollable tensing of muscles below the level of injury , occurs in 65 -- 78 % of chronic SCI .
level results from lack of input from the brain that quells muscle responses to stretch reflexes .
Spasticity , the uncontrollable tensing of muscles below the level of injury , occurs in 65 -- 78 % of chronic SCI .