Movement Time of Lower Trunk Muscles during Dynamic Postural Control in Response to a Sudden Visual Stimulus during Walking: A Pilot Study

Jaehyun Jung, Kewwan Kim, Sungjae Choi, Gwangyu Song, Young Ryu, Cholhee Kim and Chaegil Lim
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Jaehyun Jung: College of Medicine, Korea University, Seoul 02841, Korea
Kewwan Kim: Department of Physical Education, College of Arts and Physical Education, Incheon National University, Incheon 22012, Korea
Sungjae Choi: College of Medicine, Korea University, Seoul 02841, Korea
Gwangyu Song: College of Medicine, Korea University, Seoul 02841, Korea
Young Ryu: Department of Physical Education, Graduate School of Incheon National University, Incheon 22012, Korea
Cholhee Kim: Department of Physical Education, Graduate School of Incheon National University, Incheon 22012, Korea
Chaegil Lim: Department of Physical Therapy, Gachon University, Incheon 21936, Korea

IJERPH, 2021, vol. 18, issue 9, 1-8

Abstract: Postural control during walking is maintained by the combination of various factors. Among these factors, adjustment of trunk movement is essential for maintaining postural control, and the response of muscles to unpredictable stimuli affects postural control. Loss of balance while walking increases the risk of accidents, the frequency of which depends on age and sex. In this study, we investigated whether there was a difference in the movement time of trunk muscles to sudden stimulation while walking according to age and sex. Fourteen healthy individuals aged 20–30 years (6 men, 8 women) and 12 individuals aged 50–70 years (4 men, 8 women) were included in the study. Movement time of bilateral erector spinae and rectus abdominis muscles in response to visual stimulation during walking was examined using surface electromyography. Movement time was calculated as the total muscle activation time excluding the reaction time. This study revealed no significant differences in movement time of the erector spinae muscles according to sex or age. The role of the rectus abdominis muscles in maintaining posture during walking was insignificant. In conclusion, the movement time of trunk muscles in response to sudden visual stimulation during walking did not differ by age or sex, and the difference in accident frequency may be associated with deterioration of other factors required to maintain posture.

Keywords: dynamic postural control; walking; movement time; visual stimuli; lower trunk muscle (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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