Analysis of brain and muscle activity in maintaining postural balance according to the ground conditions

This paper analyzed brain and muscle activity in maintaining postural balance according to various ground conditions. For this purpose, the ground environment for maintaining the posture balance was composed of three kinds of stable condition, unstable condition, and dynamic condition. To investigate the change of the biological signal related to maintaining posture balance, brain activity of the cerebral cortex, muscle activity of trunk and lower limb were analyzed. As a result, the three-dimensional dynamic state was analyzed as the tendency of alpha wave to be greatly activated with eyes open due to the comfort of pelvic fixation. On the other hand, gamma waves involved in postural balance control were the highest in the unstable state, which utilized the posture strategy to maintain balance. As a result of the trunk muscle analysis according to the change of the ground condition, it was analyzed that the stable state was the more tendency to use the abdominal muscles, which are the central muscles, and the unstable state was the external oblique muscles and the erector muscles. The muscles of the lower limbs were greatly activated due to the postural control strategy using dorsal flexion of the ankle under unstable ground conditions. In the future, EEG and muscle analysis results according to the ground conditions and vision for maintaining dynamic postural balance will be used in rehabilitation protocol for postural balance maintenance strategy of elderly and disabled.