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Effects of Knee Extension Exercise Using Blood Flow Restriction on the Thickness and Balance Ability of Tendons
J Kor Phys Ther 2018;30(2):41-46
Published online April 30, 2018;
© 2018 The Korea Society of Physical Therapy.

Jae-Cheol Park1, Yong-Nam Kim2

1Department of Physical Therapy, Graduate School, Nambu University, Gwangju, 2Department of Physical Therapy, Nambu University, Gwangju, Korea
Yong-Nam Kim
Received March 6, 2018; Revised April 16, 2018; Accepted April 23, 2018.
This is an Open Access article distribute 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 examined the effects of knee extension exercise using blood flow restriction on the changes in the thickness and static balance ability of the tendon of the rectus femoris muscle and achilles tendon.
Methods: A total of 30 subjects was were divided into two groups of 15 subjects each. The changes in the thickness and balance of their tendons were measured by ultrasonography and balance equipment. The measurements were taken three times: before the experiment, 4 weeks after, and 8 weeks after. The results were analyzed by repeated measure ANOVA, one-way ANOVA was conducted in cases where there were time-to-group interactions in the intra-individual effects test.
Results: Significant differences in the thickness of the tendon of the rectus femoris muscle and Achilles tendon were found between the groups, over time, and in the time-to-group interactions (p<0.05). The changes in balance in both feet when the supporting positions between eye-open and eye-closed states were significantly different in the time-to-group interactions (p<0.05), but were not different between the groups (p>0.05).
Conclusion: Knee extension exercise using blood flow restriction leads to significant differences in the increase in tendon thickness and changes in balance, indicating that the results of this study can be utilized as basic data for future studies and for rehabilitation treatment at clinics.
Keywords : Blood flow restriction, Tendon, Balance, Ultrasonography

April 2018, 30 (2)
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