OBJECTIVES Anticipatory postural adjustments (APA) are used by humans to counteract the perturbation caused by the initiation of walking. Many previous studies have shown that APA can be improved through sensorimotor interventions. Therefore, the purpose of this study is to investigate the effectiveness of sensorimotor intervention strategies for improving APA in the elderly.METHODS 20 healthy elderly participants were recruited and divided into two groups according to the diagnostic criteria for sarcopenia. Sensorimotor synchronization training (SMSt) utilizing auditory signals was used as intervention to improve the APA. APA was measured during the performance of lifting the foot and narrow walking tasks to compare the continuity of movement, and walking speed was measured to assess task performance. In order to compare the change of APA, we compared the displacement of center of pressure (COP) and torque before the movement occurred.RESULTS The results showed that the inter limb transfer effect was observed in all tasks. Although no difference between the group was observed in the foot raising task, there were significant increase in the foot speed, the magnitude and torque of the APA. Such changes are considered as a strategy for offsetting an increased perturbation of the faster foot after SMSt. Unlike the raising foot task, different aspects were observed in the narrow stride walking task. In the narrow stride walking task, although the foot speed increased, there was no increase in the magnitude and torque of APA. Furthermore, the group with low muscle function showed a decrease in static.CONCLUSIONS The differences in the continuity of motor tasks observed in this study support the hypothesis that SMSt can enhance motor control and improve postural function.
OBJECTIVES This study aims to compare the change of motor control of distal joint while badminton hitting on novice in accordance with visual feedback type.METHODS We offered digitized graph and 3D animation of upper limb to quantitative feedback(QN) group, and qualitative feedback(QL) group respectively. Dependent variables are kinematic variable of wrist joint. 27 young men were recruited into three groups, asked to perform forehand-underclear. 20trials for pre-test, 150trials for practice, each 20trials for post-test and retention-test were progressed. After each 10trials in practice step, we offered each feedbacks to each groups. Two-way repeated ANOVA was used to investigate the results.RESULTS Maximum extension angle and Maximum flexion angular velocity of wrist joint improved faster than QN in early phase, but in Maximum flexion angular velocity QL improved more than QN on late phase.CONCLUSIONS Finding showed that QN improves motor control of distal joint during badminton stroke on early phase but QL may improve more on late phase. In conclusion, this study presents a new direction for the mechanism of motor control and cognitive structure for the distal joint of motor skills forming proximaldistal coordination patterns.
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