+publisher:"University of Texas – Austin" +contributor:("Sulzer, James S")

University of Texas – Austin

1. -0650-7377. Comparison of muscle coordination between individuals post-stroke and kinematically constrained walking.

Degree: MSin Engineering, Mechanical Engineering, 2019, University of Texas – Austin

URL: http://dx.doi.org/10.26153/tsw/5684

► Abnormal motor coordination affects motor function following stroke, yet we lack a complete characterization of how such abnormal coordination affects movements such as gait. Previous… (more)

▼ Abnormal motor coordination affects motor function following stroke, yet we lack a complete characterization of how such abnormal coordination affects movements such as gait. Previous research found that post-stroke gait exhibited fewer movement primitives, or muscle modules, than healthy individuals, suggesting abnormal coordination may affect gait function. However, aside from abnormal coordination, the reduced number of modules could also be due to compensations in response to other impairments such as increased muscle tone and spasticity. Our previous research compared gait in those with post-stroke Stiff-Knee Gait (SKG) to healthy individuals with kinematically constrained knee flexion. While healthy individuals compensated with pelvic obliquity, those with post-stroke SKG also exhibited greater hip abduction, suggesting the motion may be related to neural impairments such as abnormal coordination. We hypothesize that abnormal coordination, not the compensations due to restricted ranges of motion induced by other impairments, is associated with reduced gait function. In this experiment, we compared muscle coordination patterns emerging from healthy individuals with and without restricted knee kinematics to a cohort of individuals post-stroke, both with and without SKG. We predicted the number of muscle modules would be fewer than healthy individuals with similar gait kinematics and found that mechanical knee restriction reduced the number of modules similar to those with post-stroke SKG in walking. Constraining healthy motions resulted in similar muscular coordination patterns to unrestricted gait suggesting the robustness of muscle recruitment despite a kinematic perturbation. The composition of modules in the pre-swing phase between those with SKG and the mechanically restricted group differed (Spearman’s ρ = -0.024), whereas comparisons between post-stroke individuals without SKG (NSKG) and the healthy group were similar (Spearman’s ρ = 0.833). We found those with SKG relied less on hamstrings than healthy counterparts, suggesting an altered motor command beyond adaptation. Muscle coordination patterns in constrained motions during gait were not similar to SKG while the NSKG group showed greater similarity to normal walking. Thus, our data suggests that abnormal coordination may play a greater role in SKG than those without SKG. The results of this comparison will help develop more accurate interventions for clinical treatment. Advisors/Committee Members: Sulzer, James S. (advisor).

Subjects/Keywords: Stroke; Gait; Compensation; Stiff-Knee Gait; Abnormal coordination; Muscle coordination; Synergies; Biomechanics; Rehabilitation

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APA (6^th Edition):

-0650-7377. (2019). Comparison of muscle coordination between individuals post-stroke and kinematically constrained walking. (Masters Thesis). University of Texas – Austin. Retrieved from http://dx.doi.org/10.26153/tsw/5684

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Chicago Manual of Style (16^th Edition):

-0650-7377. “Comparison of muscle coordination between individuals post-stroke and kinematically constrained walking.” 2019. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021. http://dx.doi.org/10.26153/tsw/5684.

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MLA Handbook (7^th Edition):

-0650-7377. “Comparison of muscle coordination between individuals post-stroke and kinematically constrained walking.” 2019. Web. 13 Apr 2021.

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Vancouver:

-0650-7377. Comparison of muscle coordination between individuals post-stroke and kinematically constrained walking. [Internet] [Masters thesis]. University of Texas – Austin; 2019. [cited 2021 Apr 13]. Available from: http://dx.doi.org/10.26153/tsw/5684.

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Author name may be incomplete

Council of Science Editors:

-0650-7377. Comparison of muscle coordination between individuals post-stroke and kinematically constrained walking. [Masters Thesis]. University of Texas – Austin; 2019. Available from: http://dx.doi.org/10.26153/tsw/5684

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Author name may be incomplete

University of Texas – Austin

2. -1090-5095. Development of an upper-body robotic rehabilitation platform that furthers motor recovery after neuromuscular injuries.

Degree: PhD, Mechanical Engineering, 2018, University of Texas – Austin

URL: http://hdl.handle.net/2152/68010

► This dissertation presents the development of an upper-body exoskeleton and its control framework for robotic rehabilitation of the arm and shoulder after a neurological disorder… (more)

Subjects/Keywords: Robotic rehabilitation; Exoskeleton; Scapulohumeral rhythm; Neuromuscular injuries; Impedance control; Series elastic actuator; Motor learning; Stroke; Gravity support

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APA (6^th Edition):

-1090-5095. (2018). Development of an upper-body robotic rehabilitation platform that furthers motor recovery after neuromuscular injuries. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/68010

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Chicago Manual of Style (16^th Edition):

-1090-5095. “Development of an upper-body robotic rehabilitation platform that furthers motor recovery after neuromuscular injuries.” 2018. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021. http://hdl.handle.net/2152/68010.

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MLA Handbook (7^th Edition):

-1090-5095. “Development of an upper-body robotic rehabilitation platform that furthers motor recovery after neuromuscular injuries.” 2018. Web. 13 Apr 2021.

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Vancouver:

-1090-5095. Development of an upper-body robotic rehabilitation platform that furthers motor recovery after neuromuscular injuries. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2018. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/2152/68010.

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Council of Science Editors:

-1090-5095. Development of an upper-body robotic rehabilitation platform that furthers motor recovery after neuromuscular injuries. [Doctoral Dissertation]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/68010

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University of Texas – Austin

3. -5443-2090. Delineating abnormal coordination patterns in post-stroke gait : a multidisciplinary approach.

Degree: PhD, Mechanical Engineering, 2019, University of Texas – Austin

URL: http://dx.doi.org/10.26153/tsw/1373

► Stroke is the largest cause of long-term disability in U.S. where majority of the survivors experience impairments such as muscle weakness, spasticity and abnormal coordination.… (more)

▼ Stroke is the largest cause of long-term disability in U.S. where majority of the survivors experience impairments such as muscle weakness, spasticity and abnormal coordination. Stiff-Knee gait (SKG) is an incessant disability defined by the reduced knee flexion during swing. The abnormal neuromuscular mechanisms governing the interactions between impairments during SKG is still not clear. This work attempts to reveal the causal relationship between the specific influences of different impairments on post-stroke gait. Specifically, it delineates the underlying neuromuscular mechanisms behind observed increased hip abduction in SKG. The results indicate that hip abduction is part of an abnormal coordination pattern, instead of a presumed compensation for reduced knee flexion. This result is supported by previous work observing coupled knee flexion and hip abduction motions during SKG following pre-swing knee flexion torque perturbations. I hypothesized the underlying mechanism behind excessive hip abduction is due to an involuntary mechanism between quadriceps and abductor muscles which is initiated by quadriceps hyperreflexia. The results obtained from neuromusculoskeletal modeling and simulation suggest an involuntary coupled response between estimated rectus femoris (RF) and gluteus medius (GMed) activations following simulated peak RF fiber stretch velocity, suggesting an abnormal cross-planar reflex coupling initiated by excessive RF stretch reflex response. We have elicited RF reflex responses in SKG to identify the association between RF hyperreflexia and severity of the SKG excluding the influence of increased voluntary RF activity. Our results indicate a strong negative correlation between RF H-reflex response and reduced peak knee flexion angle in SKG, revealing the distinctive influence of spasticity in SKG. This novel framework delineates the abnormal neuromuscular mechanisms behind the excessive hip abduction in post-stroke gait using biomechanics, neuromusculoskeletal simulations and neurophysiological perturbations. The results obtained from this dissertation could improve lower-limb interventions for gait rehabilitation following stroke by introducing quantified measures of abnormal coordination in SKG and improve the development of subject-specific assistive technology targeting impairments to restore healthy gait. Advisors/Committee Members: Sulzer, James S. (advisor), Neptune, Richard R. (committee member), Deshpande, Ashish (committee member), Jones, Theresa (committee member), Djurdjanovic, Dragan (committee member).

Subjects/Keywords: Stroke; Gait; Movement disorder; Abnormal coordination; Rehabilitation robotics; Exoskeletons; Musculoskeletal simulation; Neurophysiology

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APA (6^th Edition):

-5443-2090. (2019). Delineating abnormal coordination patterns in post-stroke gait : a multidisciplinary approach. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://dx.doi.org/10.26153/tsw/1373

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Chicago Manual of Style (16^th Edition):

-5443-2090. “Delineating abnormal coordination patterns in post-stroke gait : a multidisciplinary approach.” 2019. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021. http://dx.doi.org/10.26153/tsw/1373.

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Author name may be incomplete

MLA Handbook (7^th Edition):

-5443-2090. “Delineating abnormal coordination patterns in post-stroke gait : a multidisciplinary approach.” 2019. Web. 13 Apr 2021.

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Author name may be incomplete

Vancouver:

-5443-2090. Delineating abnormal coordination patterns in post-stroke gait : a multidisciplinary approach. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2019. [cited 2021 Apr 13]. Available from: http://dx.doi.org/10.26153/tsw/1373.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-5443-2090. Delineating abnormal coordination patterns in post-stroke gait : a multidisciplinary approach. [Doctoral Dissertation]. University of Texas – Austin; 2019. Available from: http://dx.doi.org/10.26153/tsw/1373

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University of Texas – Austin

4. -3210-8417. Towards better assessment and training of kinematics in post-stroke gait therapy.

Degree: PhD, Mechanical Engineering, 2019, University of Texas – Austin

URL: http://dx.doi.org/10.26153/tsw/2179

► Gait impairment is common following neurological injury such as stroke. Therapists train patients based on restoring healthy motions, or kinematics, but evidence for training proper… (more)

▼ Gait impairment is common following neurological injury such as stroke. Therapists train patients based on restoring healthy motions, or kinematics, but evidence for training proper kinematics is not well-established. Because the dosage of therapy has not been well quantified, it is unclear what aspects of gait therapy are important, but simply that more therapy is likely better. However, cost restrictions prevent such intensive therapy, incentivizing value-based care. Robotic gait trainers that repetitively train a specific kinematic walking motions can potentially ease the burden on therapists and allow greater patient throughput, improving the value of therapy. Still, the cost of these trainers is only affordable to the wealthiest clinics, leaving them unavailable to the vast majority of stroke survivors. The overall goal of my research is twofold: to show the role of kinematics in gait recovery following stroke, and how these kinematics can be trained in an economical manner. My first aim focuses on design of an affordable robotic gait trainer that can adapt to an individual’s healthy gait pattern. Such a device could make robotic gait training more accessible to new markets including resource-limited hospitals and even patients’ homes. My second aim presents development of an online algorithm for producing speed-dependent reference joint trajectories that can be used for general robotic gait training applications. The goals of my third and fourth aims investigate the importance of gait kinematics using a novel longitudinal cohort approach in subacute stroke patients. I quantified the dosage of therapy using a wearable motion capture to find correlates of functional recovery, defined as gait speed. I then questioned whether gait speed was sufficient to define gait recovery, taking an innovative look at how gait quality during this subacute period changes as gait function improves. I expect these aims will justify the importance of kinematics and suggest that wearable sensors can become a valuable tool for monitoring detailed kinematic motion, providing insight for more effective therapy regimens. Advisors/Committee Members: Sulzer, James S. (advisor), Deshpande, Ashish D (committee member), Manella, Kathleen J (committee member), Neptune, Richard R (committee member), Jones, Theresa A (committee member).

Subjects/Keywords: Stroke; Gait; Kinematics; Dosage of therapy; Therapy; Gait quality; Robotic gait trainer; Rehabilitation robot

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APA (6^th Edition):

-3210-8417. (2019). Towards better assessment and training of kinematics in post-stroke gait therapy. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://dx.doi.org/10.26153/tsw/2179

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Chicago Manual of Style (16^th Edition):

-3210-8417. “Towards better assessment and training of kinematics in post-stroke gait therapy.” 2019. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021. http://dx.doi.org/10.26153/tsw/2179.

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MLA Handbook (7^th Edition):

-3210-8417. “Towards better assessment and training of kinematics in post-stroke gait therapy.” 2019. Web. 13 Apr 2021.

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Author name may be incomplete

Vancouver:

-3210-8417. Towards better assessment and training of kinematics in post-stroke gait therapy. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2019. [cited 2021 Apr 13]. Available from: http://dx.doi.org/10.26153/tsw/2179.

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Author name may be incomplete

Council of Science Editors:

-3210-8417. Towards better assessment and training of kinematics in post-stroke gait therapy. [Doctoral Dissertation]. University of Texas – Austin; 2019. Available from: http://dx.doi.org/10.26153/tsw/2179

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University of Texas – Austin

5. Shell, Courtney Elyse. Tuning prosthetic foot stiffness to improve lower-limb amputee mobility.

Degree: PhD, Mechanical Engineering, 2016, University of Texas – Austin

URL: http://hdl.handle.net/2152/68400

► The foot, ankle and surrounding musculature play key roles in walking and maneuvering. They provide not only body support but also forward propulsion, terrain adaptation,… (more)

▼ The foot, ankle and surrounding musculature play key roles in walking and maneuvering. They provide not only body support but also forward propulsion, terrain adaptation, and contributions to mediolateral balance control. Prosthetic feet have previously been designed to provide body support and, to some degree, forward propulsion and sagittal-plane terrain adaptation. However, there has been little exploration of how prosthesis design affects performance in tasks that challenge mediolateral balance, such as turning and walking on cross-slopes. In Chapter 2, the effects of prosthetic foot stiffness on unilateral transtibial amputee gait during turning were explored. Changes found in sagittal-plane kinematics and kinetics caused by more compliant prostheses were similar to those seen previously in studies of straight-line walking. This included decreased body support, increased residual limb propulsion and greater limb flexion. Mediolateral balance, measured by peak-to-peak range of whole-body angular momentum, improved with decreasing stiffness, but adaptations in coronal-plane angles, work and ground reaction force impulses were less systematic. In Chapter 3, forward dynamics simulations of a unilateral transtibial amputee stepping on a cross-slope were used to identify optimal coronal-plane stiffness profiles that improved balance control by decreasing changes in coronal-plane whole-body angular momentum. Profiles that decreased these changes were identified for ankle-inverting and ankle-everting cross-slopes as well as level ground. The change in coronal-plane whole-body angular momentum decreased with an increase in stiffness for ankle-everting cross-slopes but with a decrease in stiffness for ankle-inverting cross-slopes and level ground. Stiffness profiles influenced mediolateral balance control through the medial GRF, but were specific to each surface type. These results highlight the need to identify the surface type encountered (level, ankle-inverting or ankle-everting cross-slope) so that the stiffness profile appropriate for the surface can be set. To that end, in Chapter 4, measurements from the residual limb useful for predicting a cross-slope with a pattern recognition algorithm were identified. Residual limb kinematics, especially measurements from the foot, shank and ankle, were found to successfully predict the surface type with high accuracy. These studies have provided rationale and foundation for designing prostheses that help maintain mediolateral balance control when encountering turning or uneven terrain. Advisors/Committee Members: Neptune, Richard R. (advisor), Barr, Ronald E (committee member), Fey, Nicholas P (committee member), Klute, Glenn K (committee member), Sulzer, James S (committee member).

Subjects/Keywords: Transtibial amputee; Turning; Cross-slope; Gait; Dynamic balance; Forward dynamics simulation; Pattern recognition; Terrain prediction; Kinematics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shell, C. E. (2016). Tuning prosthetic foot stiffness to improve lower-limb amputee mobility. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/68400

Chicago Manual of Style (16^th Edition):

Shell, Courtney Elyse. “Tuning prosthetic foot stiffness to improve lower-limb amputee mobility.” 2016. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021. http://hdl.handle.net/2152/68400.

MLA Handbook (7^th Edition):

Shell, Courtney Elyse. “Tuning prosthetic foot stiffness to improve lower-limb amputee mobility.” 2016. Web. 13 Apr 2021.

Vancouver:

Shell CE. Tuning prosthetic foot stiffness to improve lower-limb amputee mobility. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2016. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/2152/68400.

Council of Science Editors:

Shell CE. Tuning prosthetic foot stiffness to improve lower-limb amputee mobility. [Doctoral Dissertation]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/68400

University of Texas – Austin

6. Ranz, Ellyn Cymbre. Mobility in individuals with traumatic lower-limb injuries : implications for device design, surgical intervention and rehabilitation therapies.

Degree: PhD, Mechanical engineering, 2016, University of Texas – Austin

URL: http://hdl.handle.net/2152/39695

► Traumatic injuries to the extremities are commonly observed in emergency room patients and military personnel in combat. Restoring high mobility and functionality is a primary… (more)

▼ Traumatic injuries to the extremities are commonly observed in emergency room patients and military personnel in combat. Restoring high mobility and functionality is a primary goal post-injury, which may require the use of rehabilitative devices, surgical interventions, and rehabilitation therapies. The research detailed in this dissertation investigates specific elements of these approaches through the use of experimental study and modeling and simulation. In the first study, the influence of passive-dynamic ankle-foot orthosis bending axis on the gait performance of limb salvage subjects was investigated. Bending axis location was altered by fabricating customized orthosis components using additive manufacturing and was tested in a gait laboratory. Altering bending axis location did not result in large or consistent changes in gait measures, however subjects expressed strong preferences for bending axis condition and preference was strongly related to specific gait measures. This suggests that preference and comfort are important factors guiding the prescription of bending axis location. In the second study, musculoskeletal modeling was used to examine the influence of transfemoral amputation surgical techniques on muscle capacity to generate forces and moments about the hip. Muscle reattachment tension and stabilization were shown to be critical parameters for post-amputation capacity, which supports the use of myodesis stabilization (muscle is reattached directly to bone) in amputation procedures. In the third study, a forward dynamics simulation of transfemoral amputee gait was developed and used to examine individual muscle and prosthesis contributions to walking subtasks. The residual hip muscles, and intact ankle, knee, and hip muscles worked synergistically to provide body support, anteroposterior propulsion, mediolateral control, and leg swing. Increased contributions of contralateral muscles to ipsilateral subtasks as well as increased duration of specific muscle contributions were observed in comparison to non-amputee and transtibial amputee walking. These findings can be used to help develop targeted rehabilitation therapies and improve transfemoral amputee locomotion. Through elucidating the influence of PD-AFO bending axis on gait performance as well as the influence of transfemoral amputation surgical techniques on muscle capacity and function, this research provides a foundation for improved rehabilitation outcomes, and thus mobility for individuals who have experienced traumatic lower-limb injuries. Advisors/Committee Members: Neptune, Richard R. (advisor), Barr, Ronald E (committee member), Crawford, Richard H (committee member), Sulzer, James S (committee member), Wilken, Jason M (committee member).

Subjects/Keywords: Biomechanics; Limb salvage; Transfemoral amputee; Additive manufacturing; Musculoskeletal modeling; Forward dynamics simulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ranz, E. C. (2016). Mobility in individuals with traumatic lower-limb injuries : implications for device design, surgical intervention and rehabilitation therapies. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/39695

Chicago Manual of Style (16^th Edition):

Ranz, Ellyn Cymbre. “Mobility in individuals with traumatic lower-limb injuries : implications for device design, surgical intervention and rehabilitation therapies.” 2016. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021. http://hdl.handle.net/2152/39695.

MLA Handbook (7^th Edition):

Ranz, Ellyn Cymbre. “Mobility in individuals with traumatic lower-limb injuries : implications for device design, surgical intervention and rehabilitation therapies.” 2016. Web. 13 Apr 2021.

Vancouver:

Ranz EC. Mobility in individuals with traumatic lower-limb injuries : implications for device design, surgical intervention and rehabilitation therapies. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2016. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/2152/39695.

Council of Science Editors:

Ranz EC. Mobility in individuals with traumatic lower-limb injuries : implications for device design, surgical intervention and rehabilitation therapies. [Doctoral Dissertation]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/39695

University of Texas – Austin

7. Harper, Nicole Guckert. Muscle function and coordination of amputee and non-amputee stair ascent.

Degree: PhD, Mechanical engineering, 2015, University of Texas – Austin

URL: http://hdl.handle.net/2152/31547

► Stair ascent is a common activity of daily living and is necessary for maintaining independence in a variety of community environments. However, it can be… (more)

▼ Stair ascent is a common activity of daily living and is necessary for maintaining independence in a variety of community environments. However, it can be a biomechanically challenging task. For example, for transtibial amputees the loss of the ankle plantarflexors coupled with the task demands of stair ascent require amputees to develop compensatory mechanisms that utilize the prosthesis and remaining musculature. The overall goal of this research was to use advanced musculoskeletal modeling and simulation techniques in a series of studies to understand how individual muscles contribute to stair ascent in non-amputees and how unilateral transtibial amputees compensate with the prosthesis and remaining musculature during stair ascent. In the first study, a simulation of non-amputee stair ascent was developed to elucidate the contributions of individual muscles and the biomechanical mechanisms by which they accomplish stair ascent. The hip abductors, hip extensors, knee extensors and plantarflexors were found to work synergistically to generate, absorb and/or transfer mechanical power to accomplish stair ascent. In the second study, a simulation of transtibial amputee stair ascent was generated to identify functional deficits and compensations necessary for amputees to ascend stairs. The passive prosthesis was able to emulate the role of the uniarticular plantarflexors, but was unable to replicate the role of the biarticular plantarflexors. As a result, compensations from other muscles were necessary. In the final study, simulations of non-amputee and amputee stair ascent were used to determine the contributions of individual muscles and the prosthesis to dynamic balance control, which was quantified using whole-body angular momentum. The prosthesis was able to replicate the role of the plantarflexors in the regulation of sagittal-plane and, to a lesser extent, transverse-plane angular momentum. However, while the non-amputee plantarflexors contributed minimally to frontal-plane angular momentum, the prosthesis acted to rotate the body towards the contralateral leg, which required additional muscle compensations. By understanding the role of the individual muscles and prosthesis in achieving stair ascent and identifying the compensations used by amputees, this research provides a foundation for designing refined prostheses and targeted rehabilitation programs that improve an individual’s ability to ascend stairs. Advisors/Committee Members: Neptune, Richard R. (advisor), Barr, Ronald E (committee member), Deshpande, Ashish D (committee member), Sulzer, James S (committee member), Wilken, Jason M (committee member).

Subjects/Keywords: Stair ascent; Amputee; Forward dynamics; Modeling and simulation; Muscle contributions; Whole-body angular momentum

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APA (6^th Edition):

Harper, N. G. (2015). Muscle function and coordination of amputee and non-amputee stair ascent. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/31547

Chicago Manual of Style (16^th Edition):

Harper, Nicole Guckert. “Muscle function and coordination of amputee and non-amputee stair ascent.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021. http://hdl.handle.net/2152/31547.

MLA Handbook (7^th Edition):

Harper, Nicole Guckert. “Muscle function and coordination of amputee and non-amputee stair ascent.” 2015. Web. 13 Apr 2021.

Vancouver:

Harper NG. Muscle function and coordination of amputee and non-amputee stair ascent. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/2152/31547.

Council of Science Editors:

Harper NG. Muscle function and coordination of amputee and non-amputee stair ascent. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/31547

8. -1102-0624. Adaptive controller for improved real-time neurofeedback with functional near-infrared spectroscopy.

Degree: MSin Engineering, Electrical and Computer Engineering, 2018, University of Texas – Austin

URL: http://hdl.handle.net/2152/68222

► Stroke is one of the most common neurological diseases and the leading cause of long-term disability in the United States. Rehabilitation after stroke can have… (more)

Subjects/Keywords: Neurofeedback; fNIRS; Functional near infrared spectroscopy; Iterative learning controller; Real-time neurofeedback; Stroke therapy; Stroke rehabilitation; Adaptive controller; Adaptive neural control

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APA (6^th Edition):

-1102-0624. (2018). Adaptive controller for improved real-time neurofeedback with functional near-infrared spectroscopy. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/68222

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Chicago Manual of Style (16^th Edition):

-1102-0624. “Adaptive controller for improved real-time neurofeedback with functional near-infrared spectroscopy.” 2018. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021. http://hdl.handle.net/2152/68222.

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MLA Handbook (7^th Edition):

-1102-0624. “Adaptive controller for improved real-time neurofeedback with functional near-infrared spectroscopy.” 2018. Web. 13 Apr 2021.

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Vancouver:

-1102-0624. Adaptive controller for improved real-time neurofeedback with functional near-infrared spectroscopy. [Internet] [Masters thesis]. University of Texas – Austin; 2018. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/2152/68222.

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Council of Science Editors:

-1102-0624. Adaptive controller for improved real-time neurofeedback with functional near-infrared spectroscopy. [Masters Thesis]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/68222

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9. -3509-804X. Accuracy, repeatability and sensitivity of IMU based motion capture systems.

Degree: MSin Engineering, Mechanical Engineering, 2018, University of Texas – Austin

URL: http://hdl.handle.net/2152/64117

► This study aims to evaluate an inertial measurement unit (IMU)-based motion capture system for lower body gait analysis on treadmills in terms of its accuracy,… (more)

▼ This study aims to evaluate an inertial measurement unit (IMU)-based motion capture system for lower body gait analysis on treadmills in terms of its accuracy, repeatability and sensitivity. The Xsens MVN BIOMECH is a popular inertial sensor-based motion capture system widely used by the gait community. However, there is insufficient information regarding its validation for use in gait. Accuracy of pelvic and lower body segments was evaluated with respect to a PhaseSpace Motion Capture System with a thirteen-camera setup. RMS errors for joint angles were evaluated at gait speeds of 1 m/s and 0.5 m/s. Repeatability was evaluated using the Coefficient of Multiple Correlation (CMC) on two different days. Sensitivity of the IMU-based motion capture (mo-cap) system was analyzed based on its ability to distinguish between gait for 1 m/s (symmetric) and 0.95 m/s, 0.9 m/s, 0.85 m/s and 0.8 m/s (asymmetric) conditions. Data from 10 healthy, young individuals were collected and analyzed. We found that the IMU-based system demonstrates reasonably high accuracy when measuring joint angles (0.47 to 3.9 degrees). Accuracy was affected by speed with higher accuracy at lower speeds, especially for Ankle dorsi/plantarflexion. Repeatability was established, with high CMC values (0.76 to 0.98), lower than similar previous studies. Gait cycles were treated as coherent entities and the ability to distinguish between small changes (0.05 m/s) was demonstrated. Sensitivity of gait cycles were compared using High Dimensional Analysis of Variance and the Adaptive Neyman test both for groups and individuals. Smaller differences can be detected at the individual level since gait can vary considerably across individuals. A representative case demonstrated significant differences (p<0.001) for Ankle dorsi/plantarflexion and Hip abduction/adduction on a comparison between 1 m/s (symmetric) and 0.95 m/s (asymmetric). These comparisons are strongly affected by calibration repeatability and more research in this domain is recommended. The IMU motion capture system demonstrates high sensitivity with the ability to differentiate small changes (0.05 m/s at 99.75% confidence) in gait. Advisors/Committee Members: Sulzer, James S. (advisor), Deshpande, Ashish (committee member).

Subjects/Keywords: IMU; Gait; Motion capture; HANOVA; Adaptive Neyman test

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APA (6^th Edition):

-3509-804X. (2018). Accuracy, repeatability and sensitivity of IMU based motion capture systems. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/64117

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Chicago Manual of Style (16^th Edition):

-3509-804X. “Accuracy, repeatability and sensitivity of IMU based motion capture systems.” 2018. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021. http://hdl.handle.net/2152/64117.

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MLA Handbook (7^th Edition):

-3509-804X. “Accuracy, repeatability and sensitivity of IMU based motion capture systems.” 2018. Web. 13 Apr 2021.

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Vancouver:

-3509-804X. Accuracy, repeatability and sensitivity of IMU based motion capture systems. [Internet] [Masters thesis]. University of Texas – Austin; 2018. [cited 2021 Apr 13]. Available from: http://hdl.handle.net/2152/64117.

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Council of Science Editors:

-3509-804X. Accuracy, repeatability and sensitivity of IMU based motion capture systems. [Masters Thesis]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/64117

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