3B06 A measurement of lower limb joint moments during the supporting sit-to-stand movement using assistance type handrail

2013 ◽  
Vol 2013.25 (0) ◽  
pp. 499-500
Author(s):  
Noriyuki OHBAYASHI ◽  
Hiromichi NAKADATE ◽  
Shigeru AOMURA ◽  
Osamu NITTA
Keyword(s):  
Lower Limb ◽  
Joint Moments ◽  
Sit To Stand

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

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.

Leg Dominance May Not Be a Predictor of Asymmetry in Peak Joint Moments and Ground Reaction Forces During Sit-to-Stand Movements

2014 ◽  
Vol 30 (1) ◽  
pp. 179-183 ◽  
Author(s):  
Jonathon S. Schofield ◽  
Eric Parent ◽  
Justin Lewicke ◽  
Jason P. Carey ◽  
Marwan El-Rich ◽  
...  
Keyword(s):  
Lower Limb ◽  
Inverse Dynamics ◽  
Bilateral Symmetry ◽  
Joint Moment ◽  
Ground Reaction Forces ◽  
Joint Moments ◽  
Sit To Stand ◽  
Reaction Forces ◽  
Three Body ◽  
Leg Dominance

Sit-to-stand transfer is a common prerequisite for many daily tasks. Literature often assumes symmetric behavior across the left and right side. Although this assumption of bilateral symmetry is prominent, few studies have validated this supposition. This pilot study uniquely quantifies peak joint moments and ground reaction forces (GRFs), using a Euclidian norm approach, to evaluate bilateral symmetry and its relation to lower limb motor-dominance during sit to stand in ten healthy males. Peak joint moments and GRFs were determined using a motion capture system and inverse dynamics. This analysis included joint moment contributions from all three body planes (sagittal, coronal, and axial) as well as vertical and shearing GRFs. A paired, one-tailedttest was used, suggesting asymmetrical joint moment development in all three lower extremity joints as well as GRFs (P< .05). Furthermore, using an unpaired two-tailedttest, asymmetry developed during these movements does not appear to be predictable by participants’ lower limb motor-dominance (P< .025). Consequently, when evaluating sit-to-stand it is suggested the effects of asymmetry be considered in the interpretation of data. The absence of a relationship between dominance and asymmetry prevents the suggestion that one side can be tested to infer behavior of the contralateral.

Correlations between residual limb length and joint moments during sitting and standing movements in transfemoral amputees

2015 ◽  
Vol 40 (4) ◽  
pp. 522-527 ◽  
Author(s):  
M Jason Highsmith ◽  
Derek J Lura ◽  
Stephanie L Carey ◽  
Larry J Mengelkoch ◽  
Seok Hun Kim ◽  
...  
Keyword(s):  
Knee Joint ◽  
Lower Limb ◽  
Clinical Relevance ◽  
Moment Magnitude ◽  
Limb Length ◽  
Residual Limb ◽  
Joint Moments ◽  
Sit To Stand ◽  
Transfemoral Amputees ◽  
Amputation Surgery

Background and aim: Longer residual limb lengths provide an increased lever arm. Longer residual limbs may produce increased joint moments; the two may be correlated. These correlations have not been evaluated in transfemoral amputees during transitional movements. Correlations between residual limb length and involved side joint moment could contribute to justification supporting maximal residual limb length preservation. This study investigated possible correlations between hip or knee moment and residual limb length. Technique: Hip and knee joint moments were determined while 21 transfemoral amputees performed sitting and standing movements and then evaluated for correlation with residual limb length. Discussion: Residual limb length was not correlated with either knee or involved side hip moments during sit to stand or stand to sit. Conversely, weak inverse correlations ( p < 0.05) existed between sound hip moment magnitude and residual limb length. These correlations suggest that in community ambulating transfemoral amputees, longer residual limb length could decrease sound hip kinetic burden during transitional movement. Beyond correlations between residual limb length and sound hip transitional movement kinetics, there are other considerations in determining residual limb length during amputation. Clinical relevance This study examines relationships between lower limb joint moments and residual limb length related to sit-to-stand and stand-to-sit activities. The results have implications for amputation surgery and rehabilitation.

scholarly journals Effects of lower limb resistance exercise on muscle strength, physical fitness, and metabolism in pre-frail elderly patients: a randomized controlled trial

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Xiaoxing Lai ◽  
Lin Bo ◽  
Hongwei Zhu ◽  
Baoyu Chen ◽  
Zhao Wu ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Resistance Exercise ◽  
Frail Elderly ◽  
Lower Limb ◽  
Intervention Group ◽  
Control Group ◽  
Walking Test ◽  
Sit To Stand ◽  
Femoris Muscle ◽  
Activity Energy

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

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

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.

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

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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