scholarly journals Postural Control Strategies and Balance-Related Factors in Individuals with Traumatic Transtibial Amputations

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7284
Author(s):  
Barbora Kolářová ◽  
Miroslav Janura ◽  
Zdeněk Svoboda ◽  
Petr Kolář ◽  
Dagmar Tečová ◽  
...  
Keyword(s):  
Postural Control ◽  
Control Strategy ◽  
Balance Control ◽  
Control Strategies ◽  
Weight Bearing ◽  
Control Test ◽  
Related Factors ◽  
Transtibial Amputation ◽  
Limits Of Stability ◽  
Postural Control Strategy

Mechanisms behind compromised balance control in people with transtibial amputation need to be further explored, as currently little is known specifically about postural control strategies in people with traumatic transtibial amputation (tTTA). The aim of this study is to assess automatic and voluntary postural control strategies in individuals with unilateral tTTA compared to those in control subjects and to define the effect of balance-related factors on these strategies. Automatic posture reactions and volitional motion toward given direction using standardized posturographic protocols (NeuroCom) of the Motor Control Test (MCT) and Limits of Stability (LOS) were assessed in eighteen participants with tTTA and eighteen age-matched controls. Compared to the controls, the participants with tTTA bore less weight on the prosthetic leg (p < 0.001) during the MCT and had reduced inclination toward the prosthetic leg (p < 0.001) within the LOS. In the tTTA group, the weight-bearing symmetry and the inclination toward the prosthetic leg (p < 0.05) was positively correlated with prosthesis use duration (p < 0.05). The current study indicates that decreased utilization of the prosthetic leg in tTTAs represents adaptive postural control strategy, but as prosthesis use duration increased, the engagement of the prosthetic leg improved.

scholarly journals Research on the control strategy of phase balance in H-bridge cascade SVG

2021 ◽  
Vol 243 ◽  
pp. 01005
Author(s):  
Anfei Xu ◽  
Linbo Gan ◽  
Ziqiang Xi ◽  
Xiaogang Du
Keyword(s):  
High Voltage ◽  
Control Strategy ◽  
Balance Control ◽  
Control Strategies ◽  
Influence Factors ◽  
Circuit Complexity ◽  
Time Performance ◽  
Phase Balance ◽  
Hardware Circuit ◽  
Selection Of

Based on the H-bridge cascaded SVG as one of the best solutions to effectively compensate reactive currents, this article focuses on the cascaded high-voltage H-bridge SVG phase balance problem. While analyzing the influence factors of the SVG DC side voltage, it summarizes and introduces 5 SVG phase balance control strategy ， Analyzed its real-time performance, stability, applicable occasions, algorithm and hardware circuit complexity, etc.Some control strategies have been simulated and verified, and the simulation results have reached the expected value, which provides a reference for the selection of balance control strategies for high-voltage SVG equipment.

scholarly journals Balance and postural control in basketball players

2017 ◽  
Vol 30 (2) ◽  
pp. 319-328 ◽  
Author(s):  
Murilo Curtolo ◽  
Helga Tatiana Tucci ◽  
Tayla P. Souza ◽  
Geiseane A. Gonçalves ◽  
Ana C. Lucato ◽  
...  
Keyword(s):  
Postural Control ◽  
Repeated Measures ◽  
Balance Control ◽  
Weight Bearing ◽  
Cross Sectional Study ◽  
Control Group ◽  
Basketball Players ◽  
Balance Test ◽  
Cross Sectional ◽  
Step Down

Abstract Introduction: Basketball is one of the most popular sports involving gestures and movements that require single-leg based support. Dorsiflexion range of motion (DROM), balance and postural control may influence the performance of this sport. Objective: To compare and correlate measures of balance, postural control and ankle DROM between amateur basketball athletes and non-athletes. Methods: Cross-sectional study, composed by 122 subjects allocated into one control group (CG = 61) and one basketball group (BG = 61). These groups were subdivided into two other groups by age: 12-14 years and 15-18 years. The participants were all tested for postural balance with the Star Excursion Balance Test (SEBT), postural control with the Step-down test and DROM with the Weight-bearing lunge test (WBLT). Between-groups differences were compared using repeated-measures multivariate analysis of variance. Normalized reaching distances were analyzed and correlated with the WBLT and Step-down test. Results: There was no difference in the scores of WBLT (P = .488) and Step-down test (P =. 916) between the groups. Scores for the anterior reach (P = .001) and total score of SEBT (P = .030) were higher in BG. The values for the posterolateral (P = .001) and posteromedial reach (P = .001) of SEBT were higher in BG at the age of 15-18. The correlation between the anterior reach of the SEBT and WBLT was significant in BG between 12-14 years (r = 0.578, P = .008), and in the CG between 15-18 years (r = 0.608, P=.001). Conclusion: The balance was better in the BG, although adolescents between 15-18 years have better balance control for the posteromedial and posterolateral reaches of the SEBT.

scholarly journals The influence of fear of falling on orthostatic postural control: a systematic review

2015 ◽  
Vol 7 (3) ◽  
Author(s):  
Nélio Silva De Souza ◽  
Ana Carolina Gomes Martins ◽  
Dângelo J.A. Alexandre ◽  
Marco Orsini ◽  
Victor Hugo Do Vale Bastos ◽  
...  
Keyword(s):  
Systematic Review ◽  
Postural Control ◽  
Control Strategy ◽  
Environmental Changes ◽  
Fear Of Falling ◽  
Motor Behavior ◽  
Center Of Pressure ◽  
Healthy Individuals ◽  
Physiological Mechanisms ◽  
Postural Control Strategy

Posture is a complex sensory-motor behavior that can be influenced by the fear of falling (FoF) during environmental changes. The aim of this paper is to investigate the influence of FoF on orthostatic postural control in healthy individuals by a systematic review. Thirteen articles were selected. Some other articles (31 references) were used to contextualize and discuss the topic. Studies in the environment made changes on the environment, in which participants were positioned in high hydraulic platforms at different heights, showed a decrease in the center of pressure in the anteroposterior oscillation where the platform was higher. This change in postural control strategy and the FoF are correlated. It can modulate the activity of the muscle spindle (H-reflex) and probably induce postural freezing phenomenon (anticipated postural anxiety). We can conclude that further studies are needed to understand the physiological mechanisms involved in FoF and its relation to changes in postural control strategy.

ZMP Tracking Control of an Android Robot Leg on Slope-Changing Ground Using Disturbance Observer and Dual Plant Models

2016 ◽  
Vol 13 (03) ◽  
pp. 1550043 ◽  
Author(s):  
Jung-Yup Kim ◽  
Young-Seog Kim
Keyword(s):  
Control Strategy ◽  
Tracking Control ◽  
Disturbance Observer ◽  
Balance Control ◽  
Control Strategies ◽  
Center Of Mass ◽  
Model Inversion ◽  
Slope Change ◽  
Ground Slope ◽  
Android Robot

This paper describes a novel zero moment point (ZMP) tracking control strategy using a disturbance observer (DOB) in the presence of ground slope change for balance control of an android robot. With regard to conventional ZMP controls, many researchers have studied ZMP tracking control strategies using an inverted pendulum model on flat level ground, and they have solved a slow response problem of nonminimum phase systems by using suitable feedforward motions called walking patterns. However, the conventional methods lead to ZMP offset errors in the presence of ground slope change; it is hence necessary to quickly eliminate the ZMP offset errors to realize robust balance control. In this paper, we rapidly eliminate the ZMP offset errors through a DOB using a model inversion for robust balance control in the presence of ground slope change. In particular, a dynamic model that uses the projected center of mass (CoM) position on the ground is additionally used as an output to solve a problem that generates an unstable pole during model inversion. Finally, the proposed control strategy is verified through MATLAB simulations and experiments using a real android leg.

scholarly journals Determinants of sport-specific postural control strategy and balance performance of amateur rugby players

2016 ◽  
Vol 19 (11) ◽  
pp. 946-950 ◽  
Author(s):  
Gary C.C. Chow ◽  
Shirley S.M. Fong ◽  
Joanne W.Y. Chung ◽  
Louisa M.Y. Chung ◽  
Ada W.W. Ma ◽  
...  
Keyword(s):  
Postural Control ◽  
Control Strategy ◽  
Balance Performance ◽  
Rugby Players ◽  
Postural Control Strategy

Postural control strategy during standing is altered in patients with multiple sclerosis

2012 ◽  
Vol 524 (2) ◽  
pp. 124-128 ◽  
Author(s):  
Jessie M. Huisinga ◽  
Jennifer M. Yentes ◽  
Mary L. Filipi ◽  
Nicholas Stergiou
Keyword(s):  
Multiple Sclerosis ◽  
Postural Control ◽  
Control Strategy ◽  
Postural Control Strategy

scholarly journals Balance control strategies during perturbed and unperturbed balance in standing and handstand

2017 ◽  
Vol 4 (7) ◽  
pp. 161018 ◽  
Author(s):  
Glen M. Blenkinsop ◽  
Matthew T. G. Pain ◽  
Michael J. Hiley
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Control Strategy ◽  
Inverted Pendulum ◽  
Mixed Strategy ◽  
Balance Control ◽  
Control Strategies ◽  
Ankle Strategy ◽  
The Central Nervous System ◽  
Fixed Orientation

Insights into sensorimotor control of balance were examined by the assessment of perturbed and unperturbed balance in standing and handstand postures. During perturbed and unperturbed balance in standing, the most prevalent control strategy was an ankle strategy, which was employed for more than 90% of the time in balance. During perturbed and unperturbed balance in handstand, the most prevalent control strategy was a wrist strategy, which was employed for more than 75% of the time in balance. In both postures, these strategies may be described as a single segment inverted pendulum control strategy, where the multi-segment system is controlled by torque about the most inferior joint with compensatory torques about all superior joints acting in the same direction to maintain a fixed orientation between superior segments. In contrast to previous literature, surprisingly little time was spent in a mixed strategy, representing less than 1% of time in standing balance and approximately 2% of time in handstand balance. Findings indicate that although the central nervous system may employ a number of control strategies during a trial, these strategies are employed individually rather than simultaneously.

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