Prediction sit-to-stand movement using trunk angle and lower limb EMG for assist system

Abstract Background Few studies examined interventions in frail elderly in China, while the awareness of applying interventions to prevent frailty in pre-frail elderly is still lacking. This study aimed to explore the effects of lower limb resistance exercise in pre-frail elderly in China. Methods This was a randomized controlled trial of patients with pre-frailty. The control group received routine care, while the exercise group received a 12-week lower limb resistance exercise based on routine care. The muscle strength in the lower limbs, physical fitness, and energy metabolism of the patients was evaluated at admission and after 12 weeks of intervention. Results A total of 60 pre-frail elderly were included in this study. The patients were divided into the exercise group (n = 30) and control group (n = 30) by random grouping. There were 17 men and 13 women aged 65.3 ± 13.4 in the exercise group, and 15 men and 15 women aged 67.6 ± 11.9 years in the control groups. The Barthel index was 80.3 ± 10.6 and 85.1 ± 11.6, respectively. The characteristics of the two groups were not significantly different before intervention (all p > 0.05). The results of repeated measurement ANOVA showed that there was statistically significant in crossover effect of group * time (all p < 0.05), that is, the differences of quadriceps femoris muscle strength, 6-min walking test, 30-s sit-to-stand test, 8-ft “up & go” test, daily activity energy expenditure and metabolic equivalent between the intervention group and the control group changed with time, and the variation ranges were different. The main effects of time were statistically significant (all p < 0.05), namely, femoris muscle strength, 6-min walking test, 30-s sit-to-stand test, 8-ft “up & go” test, daily activity energy expenditure and metabolic equivalent of the intervention group and the control group were significantly different before and after intervention. The main effects of groups were statistically significant (p < 0.05), namely, femoris muscle strength, 6-min walking test, 30-s sit-to-stand test, daily activity energy expenditure and metabolic equivalent before and after intervention were significantly different between the intervention group and the control group, while there was no significant differences in 8-ft “up & go” test between groups. Conclusion Lower limb resistance exercise used for the frailty intervention could improve muscle strength, physical fitness, and metabolism in pre-frail elderly. Trial registration ChiCTR, ChiCTR2000031099. Registered 22 March 2020, http://www.chictr.org.cn/edit.aspx?pid=51221&htm=4

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Improving sit-to-stand transition by the saddle-assistive device in the spinal cord injury: A case study

Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine ◽

10.1177/09544119211003370 ◽

2021 ◽

pp. 095441192110033

Author(s):

Akbar Hojjati Najafabadi ◽

Saeid Amini ◽

Farzam Farahmand

Keyword(s):

Spinal Cord ◽

Spinal Cord Injury ◽

Lower Limb ◽

Reaction Force ◽

Assistive Device ◽

Limb Weakness ◽

Sit To Stand ◽

Lower Limb Weakness ◽

Wide Range ◽

Cord Injury

Physical problems caused by fractures, aging, stroke, and accidents can reduce foot power; these, in the long term, can dwindle the muscles of the waist, thighs, and legs. These conditions provide the basis for the invalidism of the harmed people. In this study, a saddle-walker was designed and evaluated to help people suffering from spinal cord injury and patients with lower limb weakness. This S-AD works based on body weight support against the previously report designs. This saddle-walker consisted of a non-powered four-wheel walker helping to walk and a powered mechanism for the sit-to-stand (STS) transfer. A set of experiments were done on the STS in the use of the standard walker and the saddle-assistive device(S-AD). A comparison of the results showed that this device could reduce the vertical ground reaction force (GRF) of the legs up to 70%. Using this device could help a wide range of patients with lower limb weakness and SCI patients in changing from sitting to standing.

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Feedback Control Design for Robust Comfortable Sit-to-Stand Motions of 3D Lower-Limb Exoskeletons

IEEE Access ◽

10.1109/access.2020.3046446 ◽

2021 ◽

Vol 9 ◽

pp. 122-161

Author(s):

M. Eva Mungai ◽

Jessy W. Grizzle

Keyword(s):

Feedback Control ◽

Lower Limb ◽

Control Design ◽

Sit To Stand

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Application of Sit-To-Stand Assistive Device Based on Hip Support

Recent Patents on Mechanical Engineering ◽

10.2174/2212797614666210216110615 ◽

2021 ◽

Vol 14 ◽

Author(s):

Huaiqiang Zhang ◽

Qiang Xue ◽

Shuo Yang ◽

Tongtong Wang ◽

Binwei Zhou

Keyword(s):

Lower Limb ◽

Independent Living ◽

Structural Characteristics ◽

Assistive Devices ◽

Assistive Device ◽

Technology Application ◽

Assist Devices ◽

Advantages And Disadvantages ◽

Sit To Stand

Background: Completing the transition from a sitting position to a standing position is a basic skill in people’s daily lives and is crucial for independent living. Lower limb dysfunction will bring many inconveniences into a person’s life and greatly affect their quality of life. Patients with lower limb dysfunction are a specialized group, and nursing problems for this group are becoming increasingly serious. Helping patients with lower limb dysfunction restore their lower limb mobility or assisting them to walk is a social problem necessary to be solved. Objective: : To review the recent sit-to-stand assistive devices based on hip support, classify them systematically and introduce their characteristics, including the mechanisms and the types of patients for which such mechanisms are applicable; to help patients with lower limb dysfunction or doctors (therapists) understand and choose a reasonable sit-to-stand assist device based on hip support. Methods: This paper summarizes literatures and patents about sit-to-stand assistive devices. From the aspects of structural characteristics, drive type and support modes based on the hip and applications situation, the advantages and disadvantages of the typical sit-to-stand assist devices are represented. Results: Current and future development trends on the structural characteristics, drive type and support modes based on the hip and applications situation of sit-to-stand assist devices are discussed to improve the humanization, modularization and applicability of sit-to-stand assist devices. Conclusion: Sit-to-stand assistive devices based on hip support can help patients improve the quality of their life, assist patients carrying out rehabilitation training, and delay the decline of lower limb function. However, the existing sit-to-stand assistive devices based on hip support need further improvement in the aspects of motion mechanism, new technology application and ergonomics design.

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Reliability and Agreement of 3D Trunk and Lower Extremity Movement Analysis by Means of Inertial Sensor Technology for Unipodal and Bipodal Tasks

Sensors ◽

10.3390/s19010141 ◽

2019 ◽

Vol 19 (1) ◽

pp. 141 ◽

Cited By ~ 5

Author(s):

Rob Van der Straaten ◽

Amber K. B. D. Bruijnes ◽

Benedicte Vanwanseele ◽

Ilse Jonkers ◽

Liesbet De Baets ◽

...

Keyword(s):

Lower Limb ◽

Sagittal Plane ◽

Inertial Sensor ◽

Movement Analysis ◽

Sensor Technology ◽

Inertial Measurement ◽

Sit To Stand ◽

Movement Strategies ◽

Measurement Units ◽

Healthy Participants

This study evaluates the reliability and agreement of the 3D range of motion (ROM) of trunk and lower limb joints, measured by inertial measurement units (MVN BIOMECH Awinda, Xsens Technologies), during a single leg squat (SLS) and sit to stand (STS) task. Furthermore, distinction was made between movement phases, to discuss the reliability and agreement for different phases of both movement tasks. Twenty healthy participants were measured on two testing days. On day one, measurements were conducted by two operators to determine the within-session and between-operator reliability and agreement. On day two, measurements were conducted by the same operator, to determine the between-session reliability and agreement. The SLS task had lower within-session reliability and agreement compared with between-session and between-operator reliability and agreement. The reliability and agreement of the hip, knee, and ankle ROM in the sagittal plane were good for both phases of the SLS task. For both phases of STS task, within-session reliability and agreement were good, and between-session and between-operator reliability and agreement were lower in all planes. As both tasks are physically demanding, differences may be explained by inconsistent movement strategies. These results show that inertial sensor systems show promise for use in further research to investigate (mal)adaptive movement strategies.

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Robust nonsingular fast terminal sliding-mode control for Sit-to-Stand task using a mobile lower limb exoskeleton

Control Engineering Practice ◽

10.1016/j.conengprac.2020.104496 ◽

2020 ◽

Vol 101 ◽

pp. 104496 ◽

Cited By ~ 2

Author(s):

Joel Hernández Hernández ◽

Sergio Salazar Cruz ◽

Ricardo López-Gutiérrez ◽

Arturo González-Mendoza ◽

Rogelio Lozano

Keyword(s):

Sliding Mode Control ◽

Lower Limb ◽

Sliding Mode ◽

Terminal Sliding Mode Control ◽

Terminal Sliding Mode ◽

Lower Limb Exoskeleton ◽

Mode Control ◽

Sit To Stand ◽

Fast Terminal Sliding Mode

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Research on the Rehabilitation Robot Control Methods for Analysis of Lower Limb Kinetics during Sit to Stand Process

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.742.535 ◽

2015 ◽

Vol 742 ◽

pp. 535-539

Author(s):

Kun Liu ◽

Jian Chen Zhao ◽

En Guo Cao ◽

Xuan Han

Keyword(s):

Lower Limb ◽

Control Method ◽

Center Of Pressure ◽

Rehabilitation Robot ◽

Control Methods ◽

Real Time Control ◽

Joint Moments ◽

Kinetics Parameters ◽

Movement Trajectories ◽

Sit To Stand

A new method for analyzing lower limb kinetics during sit to stand process is presented, and a trajectory control method (TCM) and an impedance control method (ICM) for a rehabilitation robot are developed. During the sit to stand process (SSP), body segment rotational angles, movement trajectories, ground reaction forces (GRF), center of pressure (COP) and rope tensile forces are measured by the robot sensor system, and the joint moments of ankle, knee and hip are calculated in real-time control program. Test experiments were performed on six volunteers. The experimental results validate the theory that the control methods can assure the accomplishment of the sit to stand process in comfortable postures, and improve the condition of joint moments. The control methods are suitable for self-supported home training, and can be applied to assess kinetics parameters during the sit to stand process and improve the rehabilitation of patients.

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