Despite the positive effects of electrical stimulation proved on motor impairments of affected limb, the evidence is still not conclusive. There still remains a question mark regarding the effectiveness and optimal stimulation parameters of TENS. there has been conflict regarding the TENS parameters (frequency, duration, intensity) among different studies. To date TENS parameters used in different studies to reduce spasticity range from frequency of 1.7-100 Hz, duration from 15-60 minutes and sessions from 1-30. The use of different parameters may account for the contradictory results related to effectiveness of TENS.
study aims to evaluate the efficacy of high and low frequency TENS on spasticity, strength and functional status in stroke patients. It may provide further knowledge concerning the use of TENS for motor impairments in stroke patients and may clarify ambiguities to some extent.