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The Immediate Effect of Interferential Current Therapy on Muscle Tone and Stiffness in Chronic Stroke Patients
J Korean Soc Phys Med 2019;14(1):1-5
Published online February 28, 2019;
© 2019 Korean Society of Physical Medicine.

Shin-Jun Park, PT, PhD⋅Kyun-Hee Cho, PT, MS1⋅Soon-Hee Kim, PT, PhD2†

Department of Physical Therapy, GangDong University
1Department of Physical Therapy, Graduate School, Yongin University
2Department of Physical Therapy, Yongin University
Received August 24, 2018; Revised August 27, 2018; Accepted September 21, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Purpose: In chronic stroke patients, muscle tone and stiffness increase due to ankle spasticity. Electrotherapy may control the spasticity of patients with central nerve system damage via neurophysiological mechanisms. Therefore, this study was conducted to determine the immediate effects of interferential current therapy on gastrocnemius (GCM) muscle.
Methods: This study was a one-group pretest-posttest design and 20 stroke patients participated. The experimental group underwent interferential current therapy for GCM for 30 minutes. Muscle tone (MT) and stiffness were assessed using MYOTONEⓇ PRO. After 30 minutes of interferential current therapy, MT and stiffness of the affected side and unaffected side by GCM were measured.
Results: After interferential current therapy, the medial GCM MT (Hz) was significantly reduced in stroke patients. There was a significant difference in MT between affected GCM muscles and unaffected side medial GCM muscles before intervention, but there was no significant difference after interferential current therapy.
Conclusion: This study demonstrated that interferential current therapy had a positive effect, producing an immediate decrease in the medial GCM muscles tone of stroke patients. However, this study employed a one-group pretest-posttest design. Future studies will show differences in muscle tone compared to a control group or other electrical stimulation treatments.
Keywords : Asymmetrical muscle tone, Gastrocnemius muscle tone, Interferential current therapy, Stroke

February 2019, 14 (1)
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