Medico-Legal Update

Abstract

Background/Objectives: This study was conducted to compare and analyze the muscle activity of vastus lateralis, muscle vastus medialis, spinal erector muscles and gluteus maximus muscle using the EMG measuring device and suggest effective results of the bridge exercise when conducting the bridge exercise with various bridge postures using resistance of Thera-band on the stable support surface.

Method/Statistical Analysis:In order to examine the difference in the muscle activity of vastus lateralis, vastus medialis, erector spinae and gluteus maximus, a total of 3 exercises were conducted by each different posture; the normal bridge posture, the hip adduction bridge posture using the resistance of Thera-band and the hip abduction bridge posture using the resistance of Thera-band. The measured results of the experiment was analyzed by repeated measure analysis of variance

Findings: The results showed that muscle activity was all higher when conducting the bridge exercise using the resistance of Thera-band for vastus lateralis, vastus medialis, erector spinae and gluteus maximus, In the hip adduction bridge posture, vastus lateralis and vastus medialis showed significant difference, and in the hip abduction posture, gluteus maximus showed significant difference compared to the normal bridge posture.

Improvements/Applications: It is considered that the hip abduction bridge exercise and the hip adduction bridge exercise using the resistance of Thera-band can help stabilize the body.

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Background/Objectives: The kettle bell exercise is effective in improving the strength and physical strength of the whole body as a popular exercise for modern people. The purpose of this study was to compare the muscle activity of Biceps femoris, Vastus medialis oblique, Erector spine and Anterior deltoid depending on shoulder joint flexion angle when conducting kettle bell swing.

Method/Statistical Analysis:The kettle bell exercise is effective in improving the strength and physical strength of the whole body as a popular exercise for modern people. The purpose of this study was to compare the muscle activity of Biceps femoris, Vastus medialis oblique, Erector spine and Anterior deltoid depending on shoulder joint A total of 30 healthy men and women who agreed to participate in the study were the subjects. All of the kettle bell swing starting positions were conducting with flexion knee about 50° and the whole body. The shoulder flexion angle was set 90°, 140°, 180° and the end position was the same as the starting position. For comparison of the muscle activity depending on shoulder joint angle, One-way Repeated ANOVA was used and Bonferroni method for post-test.

Findings: Biceps femoris showed significant differences at all degrees(P.05). There was no significant difference in the spinal erector muscle (p>.05).

Improvements/Applications: Therefore the muscle activity degree for each muscle was clearly different depending on the shoulder angle.

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Background/Objectives: In this study, four conditions of visual and noises were examined to determine the inferior limb muscle activity after walking for 10 minutes on a treadmill.

Method/Statistical Analysis:Nine males and nine females, who agreed to participate in the study, were recruited. Participants were asked to walk on a treadmill for 10 minutes on each of the four conditions (a), (b), (c), and (d) depending on visual acuity and noise. Electromyograph was used to measure and compare muscle activity.

Findings: There was no significant difference in biceps femoris muscle(p>.05). The comparison of the tibialis anterior muscle resulted in a significant difference between the conditions a-c, a-d, b-c and b-d (pc>b>a, followed by de-conditioned vision and dB was the highest when it was higher 90. The comparison of the lateral gastrocnemius muscle resulted in a significant difference between the a-c, b-c and b-d conditions (pc>b>a, followed by de-conditioned vision and dB was the highest when it was > 90. The comparison of the medial gastrocnemius muscle showed that not all four conditions differed significantly (p>.05).

Improvements/Applications: There was significant difference in muscle activity between TA, LGM than when vision was blocked, that the muscle activity has improved when walking over 90 dB than 60 dB

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Background/Objectives: This study was conducted to examine the distance of the subacromial space when conducting external rotation according to the shoulder joint abduction angle

Method/Statistical Analysis:The study subjects were 40 volunteer participants. The abduction angle of the shoulder joint was set 0°, 45°, 90° and 120° with 10 subjects per angle as a total of 4 groups and the examined changes the subacromial space when conducting external rotation before and after. Ultrasonography was used for the measurement, and the measurement part was the subacromial space.

Findings: 0° and 45° did not show any significant difference before and after exercise. But At 90 degree, there was significant difference, pre-exercise was 10.0±0.92 and post-exercise was 10.3±0.95 (p<0.05). And at 120 degree, there was significant difference, pre-exercise was 11.5±2.62 and post-exercise was 12.05±2.51 (p<0.05).

Improvements/Applications: The distance changes according to the posture cannot be found. Because it was conducted with normal subjects, it seems to have a heavy burden to apply to patients with shoulder injury. There is a limit to generalize toward all patients. Exercise period for muscles was short. Future studies may provide better results if intervention is conducted for a long period of time in various postures and patients.

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