PNF and Movement 2023; 21(3): 291-298
https://doi.org/10.21598/JKPNFA.2023.21.3.291
Comparing Dynamic Control Ratio and Lower Extremity Muscle Activity during Eccentric Hamstring Exercises
Dae-Woo Jeong, P.T., M.S.1⋅Du-Jin Park, P.T., Ph.D.2†
1Department of Physical Therapy, Gyeongbuk Regional Rehabilitation Hospital
2Department of Physical Therapy, College of Health Sciences, Catholic University of Pusan
Correspondence to: Du-Jin Park (djpark@cup.ac.kr)
Received: September 11, 2023; Revised: October 10, 2023; Accepted: October 18, 2023; Published online: December 31, 2023.
© Korea Proprioceptive Neuromuscular Facilitation Association. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Purpose: This study aimed to suggest an effective exercise for treating anterior cruciate ligament (ACL) and hamstring injuries based on the dynamic control ratio (DCR) for the hamstring and quadriceps during eccentric hamstring exercises.
Methods: Twenty-four healthy participants participated in this study. The participants performed three eccentric hamstring exercises, including the Nordic exercise, the supine leg curl, and single-leg deadlifts. During the eccentric hamstring exercises, the vastus medialis oblique (VMO), vastus lateralis (VL), biceps femoris (BF), and semitendinosus (ST) were measured using surface electromyography.
Results: The DCR was significantly lower during the supine leg curl and single-leg deadlift than during the Nordic exercise (p < 0.05). The activity of the VMO and VL was significantly greater during the supine leg curl than during the Nordic exercise and the single-leg deadlift (p < 0.05). VL activity was significantly higher during the single-leg deadlift than during the Nordic exercise (p < 0.05). ST activity was significantly higher during the supine leg curl and Nordic exercise than during the single-leg deadlift (p < 0.05). BF activity was significantly higher during the supine leg curl than during the Nordic exercise and single-leg deadlift (p < 0.05). Finally, the BF showed significantly higher activity during the Nordic exercise compared to during the single-leg deadlift (p < 0.05).
Conclusion: Based on the DCR ratio and quadriceps activity, the supine leg curl should be introduced early in rehabilitation for ACL injuries.
Keywords: Eccentric hamstring exercise, electromyography, dynamic control ratio


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