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http://dx.doi.org/10.12674/ptk.2012.19.1.037

The Effect of Changes in Patellar Height Using Infra-Patellar Strap on the EMG Activity of Quadriceps Muscles During a Squat Exercise in Adults With Patellar Baja  

Kang, Min-Hyeok (Dept. of Physical Therapy, The Graduate School, Inje University)
Kim, Ji-Won (Dept. of Rehabilitation Science, The Graduate School, Inje University)
Yoon, Ji-Yeon (Dept. of Rehabilitation Science, The Graduate School, Inje University)
Jang, Jun-Hyeok (Dept. of Physical Therapy, Haeundae Jaseng Hospital of Oriental Medicine)
Oh, Jae-Seop (Dept. of Physical Therapy, College of Biomedical Science and Engineering, Inje University)
Publication Information
Physical Therapy Korea / v.19, no.1, 2012 , pp. 37-45 More about this Journal
Abstract
The purpose of this study was to assess the influence of patellar height on quadriceps muscles' electromyography (EMG) activity during a squat exercise in adults with patella baja. For the study, we recruited 15 volunteers who had patella baja on the right side. We measured the EMG activity of the right rectus femoris, vastus medialis oblique, and vastus lateralis muscles during squat exercises under two conditions, specifically with and without an infra-patellar strap. The infra-patellar strap was applied below the tested patella to elevate the patella to a normal height. A paired t-test was used to compare the effects of patella height on EMG activity of the quadriceps muscles. The EMG activity of the rectus femoris (RF), vastus medialis oblique (VMO), and vastus lateralis (VL) muscles were significantly decreased during the squat exercise with the infra-patellar strap compared to the same exercise without the infra-patellar strap (p<.05), while the VMO/VL ratio was not different significantly between two conditions (p>.05). The findings of this study suggest that an infra-patellar strap may benefit people with patellar baja, as changes in patellar height could improve the efficiency of the quadriceps muscles.
Keywords
Electromyography; Infra-patellar strap; Patellar baja; Quadriceps muscles;
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