[논문]The Effect of the Change in Neck Position on Muscle Activity during Arm Flexion Exercise

Cho, Sung-Hak; Kim, Chi-Hwan

doi:10.13066/kspm.2021.16.1.9

The Effect of the Change in Neck Position on Muscle Activity during Arm Flexion Exercise 원문보기

대한물리의학회지 = Journal of the korean society of physical medicine, v.16 no.1, 2021년, pp.9 - 16

Cho, Sung-Hak (Department of Physical Therapy, Kaya University) , Kim, Chi-Hwan (Department of Physical Therapy, Jaseng Hospital of Korean Medicine)

Abstract ▼ AI-Helper

PURPOSE: This study was to investigate the effect of applying neck flexion during elbow flexion exercise on muscle activity of the biceps brachii, the anterior deltoid and the sternocleidomastoid (SCM). METHODS: Twenty healthy adults participated in this study. The subjects measured %MVIC (Maximal volumetric control) and collected the maximum electromyography (EMG) values in the biceps brachii, anterior deltoid, SCM. The first action was to sit in a sitting position with the eyes facing front and maintained the weight of each section by performing elbow flexion using a tension gauge. The second action was to sit in a sitting position with the head down and maintained the weight of each section by performing elbow flexion using a tension gauge. Paired T-test was used for comparison of the before-and-after neck flexion to analyze the muscle activity of the Biceps brachii of next flexion and extension, the SCM, and the Anterior deltoid during elbow flexion exercise. The Repeated measured ANOVA was used for comparing %MVIC in each muscle. The significance level (?) was set at .05. RESULTS: Neck flexion during elbow flexion increased the muscle activity of the Biceps brachii and Anterior Deltoid muscle in the maximal muscle strength 50 ~ 60%, 70 ~ 80% and decreased the muscle activity of the SCM (p < .05). CONCLUSION: The applic has been confirmed to reduce the mobilization of the SCM and increase the mobilization of the Biceps brachii and Anterior Deltoid to increase the mobilization. Therefore, it seems effective to apply neck flexion when elbow flexion exercise.

주제어

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문제 정의

The purpose of this study was to determine the effect of applying neck flexion during elbow flexion exercise on muscle activity of the Biceps brachii, the Anterior deltoid and the SCM. However, the Anterior deltoid showed the highest EMG compared to other muscles in all sections.
In the result of EMG of middle Deltoid in flexion and standing posture, the muscle activity of middle Deltoid was significantly higher in the flexion posture rather than standing posture. This showed the result consistent with the study of researcher that the flexion and extension exercise of trunk have an effect on the shoulder muscles. Also, in the research applied the Maitland Manual technique the patient who has a chronic pain reported that the patient's pain was reduced and isometric muscular strength of the Biceps brachii was increased [18, 19].
However, data on how neck flexion affects during elbow flexion exercise is insufficient. This study was to search the effect of applying neck flexion during elbow flexion exercise on muscle activity of the Biceps brachii, the Anterior deltoid and the SCM.

제안 방법

To minimize muscle fatigue, five minute rest was provided after intervention. During the exercise, %MVIC measurement were collected for 10 seconds and used for data analysis for 8 seconds in the middle except the first and last 1 seconds. Sequence of exercise was randomly selected.
To maintain an accurate posture during performing the action, the subject conducted this experiment after twice preliminary exercise. %MVIC measurement was repeated three times, holding each action for 10 seconds with the notice “Start” and one minute of rest was taken between each action.
Twenty selected men and women subjects performed this study and every participant were based on dominant arm for measurement. This study was approved by Bioethics committee of Kaya University (Kaya IRM-265).

대상 데이터

The subjects participating in this study were total twenty adults; 15 men and 5 women, attending K university in Gyeongsangnam-do. The average age is 23.
To measure the muscle activity of the SCM and Upper limb flexors, a wireless EMG system (MA, Delsys Inc. USA) composed of 4 channels and a 4DMT-2EM.3.3 software analysis version of data analysis MG works were used for the experiment (Fig. 1). EMG electrodes were attached on the surface of the Biceps brachii, SCM, and the Anterior deltoid.

데이터처리

The Repeated measured ANOVA was used for comparing %MVIC in each muscle. The significance level (?) was set at .

성능/효과

In the result of comparing the muscle activity according to neck flexion or not, EMG of the Biceps brachii were 36.19 ± 12.13 in maximal muscle strength 50~60% section, 35.50 ± 13.83 in maximal muscle strength 60~70% section, and 34.06 ± 12.81 in maximal muscle strength 70~80% section when neck was in a neutral position. During neck flexion, EMG were 39.

참고문헌 (20)

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The Effect of the Change in Neck Position on Muscle Activity during Arm Flexion Exercise 원문보기

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The Effect of the Change in Neck Position on Muscle Activity during Arm Flexion Exercise 원문보기

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