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Exerc Sci > Volume 21(4); 2012 > Article
Exercise Science 2012;21(4): 425-433. doi: https://doi.org/10.15857/ksep.2012.21.4.425
노화가 평형성 유지 시 운동조절 기능 및 근활성도에 미치는 영향
송상협1, 박우영2, 이호성2
The effect of aging on motor control function and the muscle activation during maintain postural stability.
The purpose of this study is to examine the effect of aging on motor control function and the muscle activation during maintain postural stability. Twenty one healthy subjects in young group(21 females; 20.47±2.27 yrs) and 18 healthy subjects in elderly group(18 females; 68.57±4.65 yrs) volunteered for the study. All subjects had no history of musculoskeletal injury or neurological or vestibular disorder, or concussions. Subjects reported to the laboratory for one testing session to measure the motor control functions such as reaction time and adaptation by Dynamic Posturography while the muscle activation patterns were collected through EMG. A statistically significant decrease was observed in large backward translation(p<.05) reaction time in elderly group. Also, there were significantly decrease in adaptation A1, A2(p<.05) in elderly group. The muscle activation in elderly group thigh, gastrocnemius, and hamstring, were higher than subjects in young group during backward translation(p<.01). Also, the muscle activation on thigh(p<.01), hamstring(p<.01), tibialis anterior(p<.05), and gastrocnemius(p<.01) were significantly high in senior group. Significantly higher muscle activation in thigh, hamstring, and gastrocnemius was found during toe-up and toe-down phase in elderly women than young women. Tibialis anterior is the main muscle to keep the balance in both young and elderly women. However, elderly women have much more tibialis anterior muscle activation than young women. These results indicate that the higher level of muscle activation in the elderly woman can be explained not only by decreasing motor control function but also increasing muscle activation to maintain postural stability.
Key words: aging, reaction time, adaptation, EMG
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