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KMID : 1142420220200010135
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PNF and Movement
2022 Volume.20 No. 1 p.135 ~ p.145
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Comparison of Lower Extremity Electromyography and Ground Reaction Force during Gait Termination according to the Performance of the Stop Signal Task
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Koo Dong-Kyun
Kwon Jung-Won
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Abstract
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Purpose: The purpose of this study was to investigate the association between cognitive and motor inhibition by comparingmuscle activity and ground reaction force during unplanned gait termination according to reaction time measured throughthe stop-signal task.
Methods: Sixteen young adults performed a stop-signal task and an unplanned gait termination separately. The subjectswere divided into fast and slow groups based on their stop-signal reaction time (SSRT), as measured by the stop-signaltask. Electromyography (EMG) and ground reaction force (GRF) were compared between the groups during unplannedgait termination. The data for gait termination were divided into three phases (Phase 1 to 3). The Mann?Whitney Utest was used to compare spatiotemporal gait parameters and EMG and GRF data between groups.
Results: The slow group had significantly higher activity of the tibialis anterior in Phase 2 and Phase 3 than the fastgroup (p <0.05). In Phase 1, the fast group had significantly shorter time to peak amplitude (TPA) of the soleus thanthe slow group (p <0.05). In Phase 2, the TPA of the tibialis anterior was significantly lower in the fast group thanthe slow group (p <0.05). In Phase 3, there was no significant difference in the GRF between the two groups (p >0.05).
There were no significant difference between the two groups in the spatiotemporal gait parameters (p >0.05).
Conclusion: Compared to the slow group, the fast group with cognitive inhibition suppressed muscle activity for unplannedgait termination. The association between SSRT and unplanned gait termination shows that a participant’s ability to suppressan incipient finger response is relevant to their ability to construct a corrective gait pattern in a choice-demanding environment.
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KEYWORD
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Gait termination, Stop signal task, Electromyography
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