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Lower limb kinematics

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https://www.readbyqxmd.com/read/28820857/kinematic-and-neuromuscular-measures-of-intensity-during-plyometric-jumps
#1
David Cristóbal Andrade, Oscar Manzo, Ana Rosa Beltrán, Cristian Álvarez, Rodrigo Del Rio, Camilo Toledo, Jason Moran, Rodrigo Ramirez-Campillo
The aim of this study was to assess jumping performance and neuromuscular activity in lower limb muscles after drop jumps (DJ) from different drop heights (intensity) and during continuous jumping (fatigue), using markers such as reactive strength, jump height, mechanical power and surface electromyography (sEMG). The eccentric (EC) and concentric (CON) sEMG from the medial gastrocnemius (MG), biceps femoris (BF) and rectus (R) muscles were assessed during all tests. In a cross-sectional, randomized study, eleven volleyball players (age 24...
August 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28816618/ground-reaction-forces-produced-by-two-different-hockey-skating-arm-swing-techniques
#2
Julie Hayward-Ellis, Marion J L Alexander, Cheryl M Glazebrook, Jeff Leiter
The arm swing in hockey skating can have a positive effect on the forces produced by each skate, and the resulting velocity from each push off. The main purpose of this study was to measure the differences in ground reaction forces (GRFs) produced from an anteroposterior versus a mediolateral style hockey skating arm swing. Twenty-four elite-level female hockey players performed each technique while standing on a ground-mounted force platform, and all trials were filmed using two video cameras. Force data was assessed for peak scaled GRFs in the frontal and sagittal planes, and resultant GRF magnitude and direction...
August 17, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28814000/preliminary-study-of-a-robotic-foot-ankle-prosthesis-with-active-alignment
#3
Andrew K LaPre, Ryan D Wedge, Brian R Umberger, Frank C Sup
Robotic prosthetic foot-ankle prostheses typically aim to replace the lost joint with revolute joints aimed at replicating normal joint biomechanics. In this paper, a previously developed robotic ankle prosthesis with active alignment is evaluated. It uses a four-bar mechanism to inject positive power into the gait cycle while altering the kinematics of the ankle joint and pylon segment to reduce loading on the residual limb. In a single-subject biomechanics analysis, there was a 10% reduction in peak limb pressures and evidence of greater gait symmetry in ground reaction forces when active alignment was implemented compared to walking with the daily use prosthesis...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813896/nonlinear-disturbance-observer-based-sliding-mode-control-of-a-cable-driven-rehabilitation-robot
#4
Jie Niu, Qianqian Yang, Guangtao Chen, Rong Song
This paper introduces a cable-driven robot for upper-limb rehabilitation. Kinematic and dynamic of this rehabilitation robot is analyzed. A sliding mode controller combined with a nonlinear disturbance observer is proposed to control this robot in the presence of disturbances. Simulation is carried out to prove the effectiveness of the proposed control scheme, and the results of the proposed controller is compared with a PID controller and a traditional sliding mode controller. Results show that the proposed controller can effectively improve the tracking performance as compared with the other two controllers and cause lower chattering as compared with a traditional sliding mode controller...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813860/design-and-evaluation-of-a-modular-lower-limb-exoskeleton-for-rehabilitation
#5
Wilian M Dos Santos, Samuel L Nogueira, Gustavo C de Oliveira, Guido G Pena, Adriano A G Siqueira
This paper deals with the evaluation of an exoskeleton designed for assisting individuals to rehabilitate compromised lower limb movements resulting from stroke or incomplete spinal cord injury. The exoskeleton is composed of lightweight tubular structures and six free joints that provide a modular feature to the system. This feature allows the exoskeleton to be adapted to assist the movement of one or more patient joints. The actuation of the exoskeleton is also modular, and can be performed passively, by means of springs and dampers, or actively through actuators...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813858/active-impedance-control-of-a-knee-joint-orthosis-during-swing-phase
#6
Fatima El Zahraa Wehbi, Weiguang Huo, Yacine Amirat, Maher El Rafei, Mohamad Khalil, Samer Mohammed
In this paper, an active impedance control strategy for a knee-joint orthosis is proposed to assist individuals suffering from lower-limb muscular weaknesses during the swing phase of walking activities. The goal of the proposed strategy is to decrease the human effort required for ensuring a successful knee joint movement during walking without sacrificing the wearer's control priority. In this study, a gait-phase based desired knee-joint admittance model is designed by analyzing the kinematic and kinetic characteristics of the wearer's shank-foot segment during walking...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813855/an-optimized-design-of-a-parallel-robot-for-gait-training
#7
Marco Maddalena, Mozafar Saadat, Alireza Rastegarpanah, Rui C V Loureiro
The guidelines for enhancing robot-assisted training for post-stroke survivors head towards increasing exercise realism and variability; in particular lower limb rehabilitation needs the patient to feel challenged to adapt his locomotion and dynamic balance capabilities to different virtual ground scenarios. This paper proposes a design for a robot whose end-effector acts as a footplate to be in permanent contact with the user's foot during practice: the structure is such that it enables the user's foot to rotate around three axis, differently from what is currently available in the research for gait training; the parallel kinematic structure and the dimensional synthesis allow a suitable range of motion and aim at limiting device mass, footprint and reaction forces on the actuators when rendering virtual ground...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813853/towards-human-knee-orthosis-interaction-based-on-adaptive-impedance-control-through-stiffness-adjustment
#8
Joana Figueiredo, Paulo Felix, Cristina P Santos, Juan C Moreno
Rehabilitation interventions involving powered, wearable lower limb orthoses that can provide high-challenging locomotor tasks for repetitive training sessions, mainly when assist-as-needed strategies, such as adaptive impedance control, are designed. In this study, the adaptive behavior was ensured by software control of the robotic stiffness involved in the human-knee orthosis interaction in function of the gait cycle and speed. To estimate the stiffness, we analyzed the interaction torque-angle characteristics with experimental data...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813848/preliminary-assessment-of-a-lower-limb-exoskeleton-controller-for-guiding-leg-movement-in-overground-walking
#9
Andres Martinez, Brian Lawson, Michael Goldfarb
This paper describes the design, implementation, and preliminary validation of a controller for a powered lower-limb exoskeleton that reshapes a user's leg movement during over-ground walking. The intended application of the controller is to facilitate gait training for individuals suffering from post-stroke hemiparesis. The controller mimics a kinematic constraint between the knee and hip joints during the swing phase of gait, such that movement is not dependent on time (i.e., step time is determined entirely by the user)...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813838/developing-safe-fall-strategies-for-lower-limb-exoskeletons
#10
Mahsa Khalili, Jaimie F Borisoff, H F Machiel Van der Loos
One of the main challenges in the use of a powered lower limb exoskeleton (LLE) is to ensure that balance is maintained throughout the operation of the device. Since no control strategy has yet been implemented that prevents falls in the case of a loss of balance, head or other serious injuries may occur during independent use of LLEs in the event of a fall. These safety concerns limit LLEs in the community to supervised use only. Using the backward fall as a model, we used optimization techniques to develop safe fall control strategies in order to avoid head impact and mitigate the impact velocity of the hips...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813836/development-of-new-rehabilitation-robot-device-that-can-be-attached-to-the-conventional-knee-ankle-foot-orthosis-for-controlling-the-knee-in-individuals-after-stroke
#11
Kawasaki Shihomi, Ohata Koji, Tsuboyama Tadao, Sawada Yuichi, Higashi Yoshiyuki
This research developed a device that can be attached to the conventional Knee-Ankle-Foot-Orthosis for controlling the knee in individuals after stroke. The device automatically assists the flexion and extension movements of the knee joint at the appropriate timing. We aimed to clarify the effect of this device on gait performance, kinematic pattern and muscle activation during gait. Seventeen participants after stroke were recruited in this study. They walked with this device for 3 minutes, and we measured the 10m gait time, number of steps, knee motion using electric goniometer and muscle activities of lower limbs during gait...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813831/the-influence-of-the-re-link-trainer-on-gait-symmetry-in-healthy-adults
#12
Sarah Ward, Lukas Wiedemann, Cathy Stinear, James Stinear, Andrew McDaid
Walking function post-stroke is characterized by asymmetries in gait cycle parameters and joint kinematics. The Re-Link Trainer is designed to provide kinematic constraint to the paretic lower limb, to guide a physiologically normal and symmetrical gait pattern. The purpose of this pilot study was to assess the immediate influence of the Re-Link Trainer on measures of gait symmetry in healthy adults. Participants demonstrated a significantly lower cadence and a 62% reduction in walking speed in the Re-Link Trainer compared to normal walking...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813827/biomechanical-effects-of-robot-assisted-walking-on-knee-joint-kinematics-and-muscle-activation-pattern
#13
Pavithra Thangavel, S Vidhya, Junhua Li, Effie Chew, Anastasios Bezerianos, Haoyong Yu
Since manual rehabilitation therapy can be taxing for both the patient and the physiotherapist, a gait rehabilitation robot has been built to reduce the physical strain and increase the efficacy of the rehabilitation therapy. The prototype of the gait rehabilitation robot is designed to provide assistance while walking for patients with abnormal gait pattern and it can also be used for rehabilitation therapy to restore an individual's normal gait pattern by aiding motor recovery. The Gait Rehabilitation Robot uses gait event based synchronization, which enables the exoskeleton to provide synchronous assistance during walking that aims to reduce the lower-limb muscle activation...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813813/therapeutic-effects-of-an-anti-gravity-treadmill-alterg-training-on-gait-and-lower-limbs-kinematics-and-kinetics-in-children-with-cerebral-palsy
#14
M Lotfian, M R Kharazi, A Mirbagheri, F Dadashi, R Nourian, M M Mirbagheri
We aimed to investigate the effects of the lower body weight support treadmill (AlterG) training on kinetics and kinematics of the lower extremities in children with cerebral palsy (CP). We provided a 45-minute training program, 3 times a week for 8 weeks. AlterG can support the subject's weight up to 70% so that the subject will be able to walk more comfortably to reach a more correct walking pattern. The kinematics and kinetics were evaluated using an isokinetic dynamometer. The locomotion parameters were assessed in the gait laboratory...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28812396/the-influence-of-lower-limb-prostheses-technology-on-paracanoeing-time-trial-performance
#15
Shelley Ellis, Andrew Callaway, Bryce Dyer
Within the Paracanoeing discipline, it is important to ensure that appropriate control is achieved by a paddler with a disability. However, this Paralympic Games discipline has seen very little attention to date. The aims of this study were to understand the kinematic impact to a paracanoeist when not utilizing the use of a prosthetic lower-limb. A kayaker with a uni-lateral transfemoral amputation completed several 200 m maximal efforts both with and without their prosthesis. When the prosthetic limb was removed, there were significant differences found in stroke rate, stroke speed, stroke length and overall power output...
August 16, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/28802220/comparison-of-lower-limb-muscle-strength-between-diabetic-neuropathic-and-healthy-subjects-using-opensim
#16
Alessandra Scarton, Ilse Jonkers, Annamaria Guiotto, Fabiola Spolaor, Gabriella Guarneri, Angelo Avogaro, Claudio Cobelli, Zimi Sawacha
Diabetes neuropathy and vasculopathy are the two major complications of diabetes mellitus, leading to diabetic foot disease, of which the worst consequences are plantar ulcers and amputations. Motor impairments like joint stiffness and loss of balance are distinctive effects of diabetes and they have been extensively explored. However, while altered muscle function has been also assessed through experimentally measured surface electromyography, little is known about muscle forces. The objective of this study was to estimate muscle forces in subjects with diabetes and to use these data to identify differences with respect to a population of healthy subjects matched for age and BMI...
July 31, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28800252/progressive-changes-in-walking-kinematics-and-kinetics-after-anterior-cruciate-ligament-injury-and-reconstruction-a-review-and-meta-analysis
#17
Lindsay V Slater, Joseph M Hart, Adam R Kelly, Christopher M Kuenze
CONTEXT:   Anterior cruciate ligament (ACL) injury and ACL reconstruction (ACLR) result in persistent alterations in lower extremity movement patterns. The progression of lower extremity biomechanics from the time of injury has not been described. OBJECTIVE:   To compare the 3-dimensional (3D) lower extremity kinematics and kinetics of walking among individuals with ACL deficiency (ACLD), individuals with ACLR, and healthy control participants from 3 to 64 months after ACLR...
August 11, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28790799/bilateral-misalignment-compensating-full-dof-hip-exoskeleton-design-and-kinematic-validation
#18
Karen Junius, Marc Degelaen, Nina Lefeber, Eva Swinnen, Bram Vanderborght, Dirk Lefeber
A shared design goal for most robotic lower limb exoskeletons is to reduce the metabolic cost of locomotion for the user. Despite this, only a limited amount of devices was able to actually reduce user metabolic consumption. Preservation of the natural motion kinematics was defined as an important requirement for a device to be metabolically beneficial. This requires the inclusion of all human degrees of freedom (DOF) in a design, as well as perfect alignment of the rotation axes. As perfect alignment is impossible, compensation for misalignment effects should be provided...
2017: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/28783473/heel-rise-height-deficit-1-year-after-achilles-tendon-rupture-relates-to-changes-in-ankle-biomechanics-6-years-after-injury
#19
Annelie Brorsson, Richard W Willy, Roy Tranberg, Karin Grävare Silbernagel
BACKGROUND: It is unknown whether the height of a heel-rise performed in the single-leg standing heel-rise test 1 year after an Achilles tendon rupture (ATR) correlates with ankle biomechanics during walking, jogging, and jumping in the long-term. PURPOSE: To explore the differences in ankle biomechanics, tendon length, calf muscle recovery, and patient-reported outcomes at a mean of 6 years after ATR between 2 groups that, at 1-year follow-up, had less than 15% versus greater than 30% differences in heel-rise height...
August 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28780886/reliability-of-unipodal-and-bipodal-counter-movement-jump-landings-in-a-recreational-male-population
#20
Cédric Schwartz, Bénédicte Forthomme, Julien Paulus, Jean-François Kaux, Olivier Brüls, Vincent Denoël, Jean-Louis Croisier
Movement patterns during landing have been suggested to be related to injury risk. The purpose of this study was to determine the inter-session reliability of kinematic variables and ground reaction forces during landing in a population of male recreational athletes after a counter movement jump. Both unipodal and bipodal landings were evaluated. Furthermore, the possibility to improve landing reliability with a verbal instruction was also studied. Twenty-four male volunteers with no history of lower extremity trauma were randomly assigned to two groups (with and without verbal landing instruction)...
August 6, 2017: European Journal of Sport Science
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