[논문]Influence of Tibial Rotation on EMG Activities of Medial and Lateral Hamstrings During Maximal Isometric Knee Flexion

Lim, Woo-taek

doi:10.12674/ptk.2018.25.4.046

Influence of Tibial Rotation on EMG Activities of Medial and Lateral Hamstrings During Maximal Isometric Knee Flexion 원문보기

한국전문물리치료학회지 = Physical Therapy Korea, v.25 no.4, 2018년, pp.46 - 52

Lim, Woo-taek (Dept. of Physical Therapy, College of Health and Welfare, Woosong University)

Abstract ▼ AI-Helper

Background: The hamstring muscles in the lower extremity are highly important for knee joint stability and can be classified into medial and lateral hamstrings according to the anatomical position, which have some different functions. To measure the strength of the individual hamstring muscles, manual muscle testing is clinically performed by dividing rotation postures into internal and external postures. However, this has no sufficient scientific background. Objects: This study aimed to test the difference that the tibial rotation would cause in the muscle activity of the medial and lateral hamstrings. Methods: The muscle activities of the biceps femoris, semitendinosus, and semimembranosus were measured in a total of three different postures (neutral position and internal and external rotations) with 3 replications. During the maximal isometric contraction, resistance was constantly provided by the string attached to the strap, not by manual resistance of the examiner. Before and after electromyography measurements, the participants underwent hamstring flexibility measurement using the active knee extension test in the supine position on the treatment table. Results: The semitendinosus had a 12.56% reduction in muscle activity in external rotation as compared with that in neutral position. The biceps femoris and semimembranosus showed reduced muscle activities in both external and internal rotations as compared with those in neutral position. Only the women showed significant decreases in the comparison between pre and post-active knee extension. Conclusion: Only the semitendinosus muscle was consistent with the anatomical speculation. However, the reduction in the muscle activity of the semitendinosus as compared with that in neutral position was only 12.56%, the clinical value of which may be difficult to justify.

주제어

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문제 정의

Despite the anatomical difference between the muscles, only few studies have examined the performance of individual muscles. This study examined how the muscle activities of the medial and lateral hamstrings change in external and internal rotations in comparison with the changes in the neutral position.

제안 방법

The MVIC was measured 3 times per posture (5 sec/time, 15 sec in total), and the mean value was used. Before and after the EMG measurements, the participants were also subjected to the hamstring flexibility measurement in the supine position on the treatment table using the active knee extension test (AKE). The AKE defined by the longitudinal axes of the tibia and femur was recorded at maximal knee extension and was subtracted from 180˚.

대상 데이터

, Boston, MA, USA). The EMG data were collected from the selected Hamstrings. Delsys EMGworks® Acquisition and Analysis software was used for the analysis.
Thirty-five young and healthy college students participated in the study (Table 1). They had no injury or disease in the hip and knee joints and were given a full explanation about the study.

데이터처리

, Armonk, NY, USA). One-sample t-test was performed to test the difference in %MVIC depending on the tibial torsion within individual muscles (internal or external rotation), and the Bonferroni correction was applied. Pre- and post-AKE were compared using the paired sample t-test.
One-sample t-test was performed to test the difference in %MVIC depending on the tibial torsion within individual muscles (internal or external rotation), and the Bonferroni correction was applied. Pre- and post-AKE were compared using the paired sample t-test. Statistical significance was set at p values of <.

이론/모형

For the SM, the electrodes were attached laterally to the ST tendon in the apex of the “V” between ST tendon and the biceps femoris. Sensor was placed in accordance with SENIAM (surface EMG for non-invasive assessment of muscles) guidelines and the text book of Anatomical guide for the electromyopgapher (Perotto, 2011). Before EMG attachment, the skin was fully shaved.

성능/효과

However, the present study found that the anatomical characteristics of the muscles except the ST were not consistent with the corresponding prediction of their muscle activities. As for the ST, which showed similar results with the theoretical prediction, the ST and SM, a medial compartment, showed a reduction in muscle activity of 12.56% in external rotation as compared with that in neutral position. However, it was not statistically significant in internal rotation as compared with that in neutral position.
First, the BF showed a significant decrease in %MVIC in both external (p=.006) and internal rotations (p<.001) as compared with that measured in neutral position, with greater MVIC reduction in internal rotation (Table 2).
Second, the ST showed a significant reduction in %MVIC measured in external rotation (p<.001) in comparison with that in neutral position, while the %MVIC measured in internal rotation had no significant difference (p=.033).

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