Standing on wedges modifies side-specific postural control in the presence of lateral external perturbations

Lee, Yun Ju; Liang, Jing Nong; Chen, Bing; Ganesan, Mohan; Aruin, Alexander S.

doi:10.1016/j.jelekin.2017.06.005

Cited by 9 publications

(12 citation statements)

References 40 publications

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“…Therefore, the researchers claimed that the conditions of standing on the waged insole coped with less activity of the triceps surae muscles against disturbances and reduction in postural fluctuations (27). These findings indicate the importance of increasing the stiffness in the ankle joint as a result of using the wage (25). This mechanism is similar to the result of the present study.…”

Section: Discussionsupporting

confidence: 87%

“…Apparently, through balancing the subtalar joint and the ankle, the insole was able to prevent abnormal compensated movements in the joint and reduced postural fluctuations in a static state. According to some studies, standing on the wedge can also be associated with increased stiffness in the ankle joint (25,26). Lee et al showed that when individuals were placed on the 10-degree medial and lateral wedged insoles and the lateral perturbation occurred at the shoulder level, co-contraction of muscles in the trunk and thigh segments and the reciprocal activation in the shank muscles on the side of the perturbation were observed in both the anticipatory and compensatory postural adjustments.…”

Section: Discussionmentioning

confidence: 99%

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Comparing the effective interventions on plantar and ankle proprioception in balance control with and without fatigue

Yalfani

Asgarpour

Raeisi

2018

J Shahrekord Univ Med Sci

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Background and aims: The "postural control" is one of the important abilities to maintain body balance especially during upright stances which is a basic requirement in human life. The role of proprioception in the ankle joint function is essential to maintain balance and function correctly during gate and upright stances. Fatigue is one of the essential factors disrupting the proprioception. The purpose of the present study was to compare effective interventions on plantar and ankle proprioception in balance control with and without fatigue. Methods: Twenty female college students participated in this study. The participants taped the ankle or wore three types of insoles (i.e., normal, 10-degree lateral, and medial wedge) before and after using a fatigue protocol with and without visual information. Their static and dynamic balance was evaluated by the Biodex Balance System (BBS). Data analysis was performed employing the SPSS software. Besides, the significance level was considered at 0.05. Results: The results indicated that application of wedge insoles was associated with a significant reduction of postural sway during static balance position. In addition, the 10-degree lateral wedge insole had a greater effect for improving the balance of non-visual position after using the fatigue protocol. However, there were no significant differences between taping and insole types regarding improving the dynamic balance. Conclusion: Generally, it was inferred that wedge insoles could be used to improve the static balance with and without fatigue. However, Kinesio tape had no effect on static balance. Moreover, results regarding the effectiveness of the studied interventions in relation to the dynamic balance improvement were not significant.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Comparing the effective interventions on plantar and ankle proprioception in balance control with and without fatigue

Yalfani

Asgarpour

Raeisi

2018

J Shahrekord Univ Med Sci

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“…The lateral perturbation brought about by external impact causes side-specific postural control between the perturbed and contralateral side 13,14 . The correlated co-contraction and reciprocal activation of the trunk, thigh, and shank segments suggest that the CNS can modify postural muscle activation according to the perturbed and contralateral side of the body 13 , or a need to maintain body stability in the ML direction 14 . Corresponding postural control is also shown in the smaller COP displacements in the ML direction in response to the perturbation 14,15 .…”

Section: Introductionmentioning

confidence: 99%

“…The correlated co-contraction and reciprocal activation of the trunk, thigh, and shank segments suggest that the CNS can modify postural muscle activation according to the perturbed and contralateral side of the body 13 , or a need to maintain body stability in the ML direction 14 . Corresponding postural control is also shown in the smaller COP displacements in the ML direction in response to the perturbation 14,15 . Together, step initiation or the lateral perturbations of the previous studies were all imposed as a single perturbation to balance maintenance.…”

Section: Introductionmentioning

confidence: 99%

“…In spite of disturbed balance in the anterior-posterior direction, capacity of controlling ML postural stability has been associated with falls in older adults 19,20 . Step initiation 1,19 or the lateral perturbation 13,14 threatens postural stability in the ML direction and alters COP displacement. However, the external pulling system at the waist level could potentially improve step initiation in older adults 21 and Parkinson’s patients 22 .…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of medial-lateral postural control while exposed to the external perturbation in step initiation

Lee

Liang

Chen

et al. 2019

Sci Rep

Self Cite

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Controllability of posture in the medial-lateral direction is critical for balance maintenance, particularly in step initiation. The objective of the current study was to examine the effects of external perturbation and landing orientation on medial-lateral control stability in step initiation. Eleven young healthy participants stood on the force platform and waited for the instruction of taking a step while experiencing a pendulum perturbation applied at the lateral side of the right shoulder. Eight experimental conditions were conducted by two levels of step side (right or left), two levels of perturbation (with or without), and two levels of landing orientation (forward or diagonal). The center of pressure (COP), pelvic movements, and muscle activities were recorded and analyzed as the onset of COP and pelvic movement, the COP displacement, and cocontraction and reciprocal muscle activation pattern. The temporal events of COP and pelvic movement were not significantly different in all experimental conditions. However, COP and pelvic movement were significantly later in the diagonal condition. Most of the segments showed reciprocal muscle activation patterns in relation to the perturbation released time. Subsequently, all segments showed cocontraction muscle activation patterns, which was significantly affected by step side, perturbation, and orientation. The results suggest that how the CNS initiated a step was identical with the COP then pelvic movement. The outcome highlights the importance of external perturbation and foot landing orientation effects on postural adjustments, which may provide a different approach to help step initiation.

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Changes in the symmetry of external perturbations affect patterns of muscle activity during gait initiation

Lee

2019

Gait & Posture

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Standing on wedges modifies side-specific postural control in the presence of lateral external perturbations

Cited by 9 publications

References 40 publications

Comparing the effective interventions on plantar and ankle proprioception in balance control with and without fatigue

Comparing the effective interventions on plantar and ankle proprioception in balance control with and without fatigue

Characteristics of medial-lateral postural control while exposed to the external perturbation in step initiation

Changes in the symmetry of external perturbations affect patterns of muscle activity during gait initiation

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