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Comparison of the Changes in the Range of Motion on the Knee Joint According to the Contraction Intensity During Evjenth-Hamberg Stretching in Healthy Subjects: A Cross-Sectional Pilot Study
J Korean Soc Phys Med 2019;14(3):1-11
Published online August 31, 2019;
© 2019 Journal of The Korean Society of Physical Medicine.

Do-Kwan Kim, PT, MSc⋅Chang-Yong Kim, PT, PhD1⋅Dong-Kwon Seo, PT, PhD2⋅ Byoung-Kwon Lee PT, PhD2†

SEOL Orthopedics Surgery
1Scientific Instruments Reliability Assessment Center, Korea Basic Science Institute
2Deptartment of Physical Therapy, Konyang University
Received March 29, 2019; Revised April 2, 2019; Accepted May 30, 2019.
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: This study compared the changes in the range of motion (ROM ) on the knee joint according to three different isometric contraction intensities when applying Evjenth- Hamberg stretching (EHS) to the hamstring muscles of healthy subjects.
METHODS: Forty eight healthy subjects aged between 20 and 39 years were allocated randomly to four groups; performing EHS at 10% maximum voluntary isometric contraction (MVIC) group, EHS at 50% MVIC group, EHS at 100% MVIC group, and control group (CG) pre-, and post-intervention. The flexibility of the hamstring muscles was evaluated using a digital goniometer for measuring the knee joint ROM motion. A Chattanooga stabilizer was used to adjust the MVIC intensity by 10%, 50%, and 100%, respectively.
RESULTS: These results show that the pre- and post- intervention knee joint ROM were significantly different in all four groups (p<.05). The post-intervention knee joint ROM showed a significant difference between the 100% MVIC group and non-MVIC group (p<.05). The knee joint ROM difference between the pre- and post-interventions was similar in the 10% MVIC and 50% MVIC groups but significant differences were observed among the other groups (p<.05).
CONCLUSION: EHS of the hamstring muscles was effective in improving the knee joint ROM with an isometric contraction intensity of 10%, 50%, or 100% MVIC, and of these, 100% MVIC was most effective.
Keywords : Evjenth-Hamberg stretching, Hamstring muscle, Isometric contraction intensity, Knee joint, Range of motion

August 2019, 14 (3)
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