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gait variability

Steven van Andel, Michael H Cole, Gert-Jan Pepping
INTRODUCTION: The regulation of one's step length by placing one's foot at a specific position within gait, otherwise known as 'locomotor pointing', is well understood in walking and running gait. The current study was the first to broaden this understanding to a larger cohort and to describe the influence of age on the regulation of locomotor pointing when walking up to and stepping onto a curb-like platform. METHODS: Younger (n = 17, mean age: 25.35 years, range: 19-33) and older adults (n = 105, mean age: 71...
2018: PloS One
Roland Zügner, Roy Tranberg, Vera Lisovskaja, Johan Kärrholm
BACKGROUND: The gait pattern varies within the population and between patient groups with different musculoskeletal diseases. It also varies over time due to various reasons. Three-dimensional gait analysis (3DGA) is frequently used to measure these changes, but the precision of this methodology may vary. METHODS: We primarily aimed to study the repeatability of hip motion measurements in patients with unilateral osteoarthritis (OA), patients with unilateral total hip arthroplasty (THA) and healthy controls...
July 18, 2018: BMC Musculoskeletal Disorders
Carmen Ridao-Fernández, Gema Chamorro-Moriana, Joaquín Ojeda
BACKGROUND: Assisted gait with forearm crutches is frequently performed during the recovery of musculoskeletal injuries of the lower limb. The amount of body weight applied to the crutch or crutches depends on the pathology and the treatment phase. The transition from assisted gait with two crutches to a single crutch is usually recommended when the subject is able to load the 50% of the body weight upon the affected member. An altered assisted gait will cause biomechanic alterations and, therefore, longer treatments and relapses...
July 18, 2018: Biomedical Engineering Online
Jacob J Capin, Ashutosh Khandha, Ryan Zarzycki, Kurt Manal, Thomas S Buchanan, Lynn Snyder-Mackler
BACKGROUND: Knee osteoarthritis risk is high after anterior cruciate ligament reconstruction (ACLR) and arthroscopic meniscal surgery, and higher among individuals who undergo both. Although osteoarthritis development is multifactorial, altered walking mechanics may influence osteoarthritis progression. The purpose of this study was to compare gait mechanics after ACLR among participants who had undergone no medial meniscal surgery, partial medial meniscectomy, or medial meniscal repair...
July 18, 2018: Journal of Bone and Joint Surgery. American Volume
Martin Thaler, Ricarda Lechner, David Putzer, Eckart Mayr, Dèbora Coraça Huber, Michael C Liebensteiner, Michael Nogler
BACKGROUND: The purpose of the study was to determine the long-term functional outcome of two hip approaches by gait analysis. Patients were selected by prospective randomization, and operated on either by the anterolateral approach or by a minimally invasive direct anterior approach. METHODS: 33 patients (17 anterolateral approach; 16 direct anterior approach) were analyzed using a Vicon 870 system. Gait analysis was performed two years after total hip arthroplasty...
June 28, 2018: Clinical Biomechanics
Yu Tian, Yifei Huang, Jibo He, Kunlin Wei
Texting on a cell phone disrupts walkers' gait performance. The performance decrement has been attributed to increased motor demand, decreased visual information and increased cognitive load. However, relative contributions of motor, visual and cognitive factors are poorly understood. Here we quantitatively estimated the relative contributions of these factors by comparing multiple walking conditions. Thirty-two adults walked for 20m, with or without a dual task on the phone. The dual task was either a cognitively-demanding digit ordering task or a casual tapping task...
July 16, 2018: Ergonomics
David Quintero, Dario J Villarreal, Daniel J Lambert, Susan Kapp, Robert D Gregg
Control systems for powered prosthetic legs typically divide the gait cycle into several periods with distinct controllers, resulting in dozens of control parameters that must be tuned across users and activities. To address this challenge, this paper presents a control approach that unifies the gait cycle of a powered knee-ankle prosthesis using a continuous, user-synchronized sense of phase. Virtual constraints characterize the desired periodic joint trajectories as functions of a phase variable across the entire stride...
June 2018: IEEE Transactions on Robotics: a Publication of the IEEE Robotics and Automation Society
Holly Stock, Richard van Emmerik, Cassie Wilson, Ezio Preatoni
BACKGROUND: Coordination variability is thought to provide meaningful insights into motor learning, skill level and injury prevention. Current analytical techniques, based on vector coding (VC) methods, use calculations from circular statistics. However a statistical artefact associated with the application of circular statistics may artificially increase the estimated coordination variability, especially when VC vectors are short. RESEARCH QUESTION: Are two popular methods for calculating vector coding coordination variability susceptible to contamination by statistical artefacts and if so, how can coordination variability be calculated without statistical artefact? METHODS: A combination of simulated and experimental data was used to prove the existence of the statistical artefact and to understand the extent to which it may affect experimental running gait data, respectively...
June 28, 2018: Gait & Posture
Vanessa Ade, Dale Schalkwijk, Michael Psarakis, Michael D Laporte, Timothy J Faras, Remi Sandoval, Fadi Najjar, Peter W Stubbs
The objective of the current study was to determine the test-retest reliability of heel-to-toe progression measures in the stance phase of gait using intraclass correlation coefficient (ICC) analysis. It has been proposed that heel-to-toe progression could be used as a functional measure of ankle muscle contracture/weakness in clinical populations. This was the first study to investigate the test-retest reliability of this measure. Eighteen healthy subjects walked over the GAITRite® mat three times at a comfortable speed on two sessions (≥ 48 hours apart)...
2018: PloS One
Lousin Moumdjian, Jeska Buhmann, Iris Willems, Peter Feys, Marc Leman
Background: Interdisciplinary work is needed for scientific progress, and with this review, our interest is in the scientific progress toward understanding the underlying mechanisms of auditory-motor coupling, and how this can be applied to gait rehabilitation. Specifically we look into the process of entrainment and synchronization; where entrainment is the process that governs the dynamic alignments of the auditory and motor domains based on error-prediction correction, whereas synchronization is the stable maintenance of timing during auditory-motor alignment...
2018: Frontiers in Human Neuroscience
Andrew Sawers, Tanvi Bhatt
Is there a neuromuscular basis for falls? If so it may provide new insight into falls, their assessment and treatment. We hypothesized that falls and recoveries from a laboratory-induced slip would be characterized by differences in multi-muscle coordination patterns. Using muscle synergy analysis we identified different multi-muscle coordination patterns between older adults who fell and those who recovered from a laboratory-induced "feet-forward" slip. Participants who fell recruited fewer muscle synergies than participants who recovered...
July 11, 2018: Journal of Neurophysiology
Peng Ren, Shiang Hu, Zhenfeng Han, Qing Wang, Shuxia Yao, Zhao Gao, Jiangming Jin, Maria L Bringas, Dezhong Yao, Bharat Biswal, Pedro A Valdes-Sosa
OBJECTIVE: A new approach, named bilateral motion data fusion, was proposed for the analysis of movement symmetry, which takes advantage of cross-information between both sides of the body and processes the unilateral motion data at the same time. METHODS: This was accomplished using canonical correlation analysis and joint independent component analysis. It should be noted that human movements include many categories, that cannot be enumerated one by one. Therefore, the gait rhythm fluctuations of the healthy subjects and patients with neurodegenerative diseases were employed as an example for method illustration...
April 24, 2018: IEEE Transactions on Bio-medical Engineering
Xueyi Zhang, Goeran Fiedler, Zhe Cao, Zhicheng Liu
BACKGROUND: Prosthetists conventionally evaluate alignment based on visual interpretation of patients' gait, which is convenient, but largely subjective and depends on prosthetists' experience. OBJECTIVE: In this paper, we explore the feasibility of using a support vector machine (SVM) approach to automatically detect misalignment of trans-tibial prostheses through ground reaction force (GRF). METHODS: Alternate classification algorithms with varying kernels and feature sets were compared to assess the suitability for detection of a representative misalignment (six degrees of ankle plantar flexion) from normal alignment...
June 29, 2018: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
Mary Emily Littrell, Young-Hui Chang, Brian P Selgrade
Clinically, measuring gait kinematics and ground reaction force (GRF) is useful to determine the effectiveness of treatment. However, it is inconvenient and expensive to maintain a laboratory-grade gait analysis system in most clinics. The purpose of this study was to validate a Wii Balance Board, Kinovea motion-tracking software, and a video camera as a portable, low-cost, overground gait analysis system. We validated this low-cost system against a multi-camera Vicon system and AMTI force platform. After validation trials with known weights and angles, five subjects walked across an instrumented walkway multiple times (n=8/subject)...
July 10, 2018: Journal of Applied Biomechanics
Anjali Sivaramakrishnan, Sangeetha Madhavan
BACKGROUND AND PURPOSE: Transcranial magnetic stimulation is used to measure the functional integrity of the corticomotor system via motor evoked potentials (MEPs) in stroke. The association between corticomotor mechanisms and walking recovery is still not completely understood. This study determined the association between transcranial magnetic stimulation-induced MEPs and walking outcomes and examined the contribution of the contralesional hemisphere to walking recovery. METHODS: Contralateral and ipsilateral transcranial magnetic stimulation responses from the contralesional and ipsilesional hemispheres were collected from 61 chronic stroke survivors...
July 9, 2018: Stroke; a Journal of Cerebral Circulation
Bowen Su, Roger Newson, Harry Soljak, Michael Soljak
BACKGROUND: Rehabilitation programmes are used to improve hip fracture outcomes. There is little published trial clinical trial or population-based data on the effects of the type or provider of rehabilitation treatments on hip fracture outcomes. We evaluated the associations of rehabilitation interventions with post-operative hip fracture outcomes. METHODS: Cross-sectional (2013-2015) analysis of data from the English National Hip Fracture Database (NHFD) from all 191 English hospitals treating hip fractures...
July 9, 2018: BMC Musculoskeletal Disorders
Brunno L Moreira, Tasos Karakostas, Luciano S Dias
BACKGROUND: Rectus femoris transfer (RFT) is performed in children with cerebral palsy to treat stiff-knee gait. However, the results are variable in part because there is no gold standard to identify appropriate candidates. Hip flexion kinematics and kinetics are important factors in the determination of peak knee flexion during gait. This study aimed to evaluate whether a kinetic preoperative analysis of hip power can be a predictor of RFT outcomes and determine its usability for identifying appropriate candidates for the procedure...
July 6, 2018: Journal of Pediatric Orthopedics
H Piitulainen, T Rantalainen, J P Kulmala, H Mäenpää
Children with cerebral palsy (CP) have gait impairments, and their gait is affected by concurrent tasks. We used inertial measurement units (IMU) to quantify CP-related gait complexity alterations, and identify effects of dual tasks on gait variability from 12 children with CP and 23 typically developed (TD) controls. The data were collected for normal and dual-tasks (motor; carrying a tray, cognitive; word naming) during walking. Step duration and adjusted multiscale entropy (MSE) index were computed. In overall, children with CP had shorter step duration and greater gait complexity than TD...
July 3, 2018: Gait & Posture
Bradley J Bowser, Rebecca Fellin, Clare E Milner, Michael B Pohl, Irene S Davis
Increased vertical impact loading during running has been associated with a variety of running related injuries including stress fractures, patellofemoral pain and plantar fasciitis. PURPOSE: The purpose of this study was to examine the acute and long-term effect of a gait retraining program aimed at teaching runners with high impact loading to run softer. METHODS: 19 runners with high tibial shock first underwent a control period of 8 sessions of treadmill running over 2 weeks, progressing from 15 to 30 minutes...
July 2, 2018: Medicine and Science in Sports and Exercise
John M Adaska, Guillermo Rimoldi, Patricia C Blanchard, John Champagne, Robert H Poppenga, Michelle Mostrom
Over a 1-y period, a California calf-raising operation experienced 4 separate episodes of sudden death in 4-6-mo-old steers. Each episode occurred in 1-3 contiguous pens on 1 of 3 properties owned by the operation, but eventually all 3 properties were involved. In each episode, animals appeared normal at the evening feeding but at the subsequent morning feeding were found dead or dying. Remaining live calves had a stiff gait and were often dribbling urine, but did not show respiratory signs until they were down and agonal...
July 1, 2018: Journal of Veterinary Diagnostic Investigation
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