[논문]Effects of Isometric Upper Limb Contraction on Trunk and Leg Muscles During Sit-to-stand Activity in Healthy Elderly Females

Jang, Eun-Mi; Oh, Jae-Seop; Kim, Mi-Hyun

doi:10.13066/kspm.2017.12.1.61

Effects of Isometric Upper Limb Contraction on Trunk and Leg Muscles During Sit-to-stand Activity in Healthy Elderly Females 원문보기

대한물리의학회지 = Journal of the korean society of physical medicine, v.12 no.1, 2017년, pp.61 - 66

Jang, Eun-Mi (Dept. of Rehabilitation Science, Graduate School, Inje University) , Oh, Jae-Seop (Dept. of Physical Therapy, Inje University) , Kim, Mi-Hyun (Dept. of Physical Therapy, Inje University)

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PURPOSE: The purpose of this study was to investigate the effects of isometric upper limb contraction on the trunk and lower extremity muscles during the sit-to-stand activity in elderly females. METHODS: Eighteen healthy elderly females performed three directional isometric upper extremity contractions (flexion, extension, and horizontal abduction movements) using an elastic band during sit-to-stand activity. Electromyography signals were collected from the internal oblique, erector spinae, rectus femoris, and biceps femoris muscles. RESULTS: Internal oblique activity was greater in bilateral shoulder flexion and bilateral shoulder horizontal abduction than in neutral position (p<.05). Erector spinae and rectus femoris muscle activities in bilateral shoulder flexion was greater than in neutral position and bilateral shoulder extension (p<.05). Biceps femoris activity was significantly greater in bilateral shoulder flexion than in bilateral shoulder extension and horizontal abduction, and in neutral position compared to bilateral shoulder extension (p<.05). CONCLUSION: These results suggest that incorporating isometric upper limb contraction may be beneficial for enhancing the contribution of trunk and lower extremity muscle activities to trunk stabilization during sit-to-stand activity. Therefore, isometric upper limb contraction during sit-to-stand tasks, especially in flexion, may be used to elicit contraction of the lumbopelvic region muscles within a tolerable range, for developing endurance and strength in the elderly.

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문제 정의

The goal of this study was to investigate electromyography activities of trunk and lower limb muscles during STS with isometric upper limb contraction. Overall, the result of this study was increased muscle activities of the IO, ES, RF, and BF in Flex condition compared to N, Ext, and H-Abd conditions.
There are no studies on effects of the resistance direction of upper extremity on trunk and leg muscles during a dynamic movement such as STS. Therefore, the purpose of this study was to quantify and compare how isometric contractions of upper extremity affect trunk and lower extremity electromyography activity during STS in healthy old adults.
This study investigated the effect of the resistance direction of upper limb on trunk and lower extremity muscle activity during STS. With isometric upper limb Flex condition, most subjects appeared to respond during STS with strong co-contractions of trunk and lower extremity muscles.

대상 데이터

The electrodes were positioned on four sites on the right side of the subjects’ bodies: internal oblique (IO), erector spinae (ES), rectus femoris (RF), and biceps femoris (BF) muscles.

데이터처리

Significant differences among the four conditions (neutral, extension, horizontal abduction, and flexion) were examined using a repeated-measures analysis of variance (ANOVA). If a significant difference was found, post hoc Fisher’s Least Significant Difference (LSD) correction was performed to determine differences in pair-wise comparison.

성능/효과

EMG activity of RF was significantly greater for the Flex condition compared to N and Ext conditions (p<.05), and EMG activity of BF was significantly greater for the Flex condition compared to Ext and H-Abd condition, and for N condition compared to Ext condition (p<.05, respectively).
The goal of this study was to investigate electromyography activities of trunk and lower limb muscles during STS with isometric upper limb contraction. Overall, the result of this study was increased muscle activities of the IO, ES, RF, and BF in Flex condition compared to N, Ext, and H-Abd conditions. Our study was the first to examine trunk and lower extremity muscle activation on isometric upper limb contractions during an STS activity.
In this study, we also investigated the effects of resistance direction using an elastic band on trunk and hip muscle activities during STS with isometric upper limb contraction. The results indicate that the direction of resistance on the upper limb appeared to affect the activation patterns of the IO, ES, RF, and BF muscles. When a limb is moved, the body reacts with forces that are equal in magnitude, but in the opposite direction to the limb movement.

후속연구

These results will be helpful in developing strategies for successful STS task performance in training programs for older women with muscle weakness. Further studies are needed to measure the control of resistance amount by applying in the individually. Measuring strength of the upper and lower limb muscles by an objective method and investigating whether these results have implications for the rehabilitation of patients is also a topic for further research.
Second, we did not control of resistance amount by applying in the individually. Further studies are needed to measure the strength of the arm muscles by an objective method and to investigate whether these results have implications for patient rehabilitation.

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Effects of Isometric Upper Limb Contraction on Trunk and Leg Muscles During Sit-to-stand Activity in Healthy Elderly Females 원문보기

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Effects of Isometric Upper Limb Contraction on Trunk and Leg Muscles During Sit-to-stand Activity in Healthy Elderly Females 원문보기

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