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Kinematics

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https://www.readbyqxmd.com/read/29781934/absolute-reliability-and-concurrent-validity-of-the-stryd-system-for-the-assessment-of-running-stride-kinematics-at-different-velocities
#1
Felipe García-Pinillos, Luis E Roche-Seruendo, Noel Marcén-Cinca, Luis A Marco-Contreras, Pedro A Latorre-Román
García-Pinillos, F, Roche-Seruendo, LE, Marcen-Cinca, N, Marco-Contreras, LA, and Latorre-Román, PA. Absolute reliability and concurrent validity of the Stryd system for the assessment of running stride kinematics at different velocities. J Strength Cond Res XX(X): 000-000, 2018-This study aimed to determine the absolute reliability and to evaluate the concurrent validity of the Stryd system for measuring spatiotemporal variables during running at different velocities (8-20 km·h) by comparing data with another widely used device (the OptoGait system)...
May 17, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29781118/ballistic-tongue-projection-in-a-miniaturized-salamander
#2
Stephen M Deban, Segall V Bloom
Miniaturization of body size is often accompanied by peculiarities in morphology that can have functional consequences. We examined the feeding behavior and morphology of the miniaturized plethodontid salamander Thorius, one of the smallest vertebrates, to determine if its performance and biomechanics differ from those of its larger relatives. High-speed imaging and dynamics analysis of feeding at a range of temperatures show that tongue projection in Thorius macdougalli is ballistic and achieves accelerations of up to 600 G with low thermal sensitivity, indicating that tongue projection is powered by an elastic-recoil mechanism...
May 20, 2018: Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology
https://www.readbyqxmd.com/read/29780837/foot-kinematics-differ-between-runners-with-and-without-a-history-of-navicular-stress-fractures
#3
James Becker, Stanley James, Louis Osternig, Li-Shan Chou
Background: A navicular stress fracture (NSF) is a common and high-risk injury in distance runners. It is not clear whether there are differences in foot structure and function between runners who have and those who have not sustained an NSF. Purpose/Hypothesis: This study compared foot structure, range of motion, and biomechanics between runners with a history of unilateral NSFs and runners who had never sustained this injury. The hypothesis was that runners with a history of NSFs will have less dorsiflexion and subtalar range of motion in a clinical examination and greater rearfoot eversion and higher eversion velocity while running than either the noninvolved feet or healthy controls...
April 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29780617/patellar-tracking-in-primary-total-knee-arthroplasty
#4
Simon Donell
This is a review of the recent literature of the various factors that affect patellar tracking following total knee arthroplasty (TKA).Patellar tracking principally depends on the pre-existing patellar tracking and the rotational alignment of the femoral and tibial implants, but the detailed movements depend on the patellar shape. The latter means that the patellar kinematics of any implanted TKA does not return to normal.Laboratory cadaveric studies use normal knees and non-activity-based testing conditions and so may not translate into clinical findings...
April 2018: EFORT Open Reviews
https://www.readbyqxmd.com/read/29779940/encoding-of-articulatory-kinematic-trajectories-in-human-speech-sensorimotor-cortex
#5
Josh Chartier, Gopala K Anumanchipalli, Keith Johnson, Edward F Chang
When speaking, we dynamically coordinate movements of our jaw, tongue, lips, and larynx. To investigate the neural mechanisms underlying articulation, we used direct cortical recordings from human sensorimotor cortex while participants spoke natural sentences that included sounds spanning the entire English phonetic inventory. We used deep neural networks to infer speakers' articulator movements from produced speech acoustics. Individual electrodes encoded a diversity of articulatory kinematic trajectories (AKTs), each revealing coordinated articulator movements toward specific vocal tract shapes...
May 8, 2018: Neuron
https://www.readbyqxmd.com/read/29779856/kinematic-reconstruction-in-cardiovascular-imaging
#6
G Bastarrika, I J González de la Huebra Rodríguez, M Calvo-Imirizaldu, V M Suárez Vega, A Alonso-Burgos
OBJECTIVE: Advances in clinical applications of computed tomography have been accompanied by improvements in advanced post-processing tools. In addition to multiplanar reconstructions, curved planar reconstructions, maximum intensity projections, and volumetric reconstructions, very recently kinematic reconstruction has been developed. This new technique, based on mathematical models that simulate the propagation of light beams through a volume of data, makes it possible to obtain very realistic three dimensional images...
May 17, 2018: Radiología
https://www.readbyqxmd.com/read/29779737/neurodevelopmental-perspectives-on-dance-learning-insights-from-early-adolescence-and-young-adulthood
#7
Dilini K Sumanapala, Jon Walbrin, Louise P Kirsch, Emily S Cross
Studies investigating human motor learning and movement perception have shown that similar sensorimotor brain regions are engaged when we observe or perform action sequences. However, the way these networks enable translation of complex observed actions into motor commands-such as in the context of dance-remains poorly understood. Emerging evidence suggests that the ability to encode specific visuospatial and kinematic movement properties encountered via different routes of sensorimotor experience may be an integral component of action learning throughout development...
2018: Progress in Brain Research
https://www.readbyqxmd.com/read/29779423/cognitive-performance-and-locomotor-adaptation-in-persons-with-anterior-cruciate-ligament-reconstruction
#8
Amanda E Stone, Jaimie A Roper, Daniel C Herman, Chris J Hass
BACKGROUND: Persons with anterior cruciate ligament reconstruction (ACLR) show deficits in gait and neuromuscular control following rehabilitation. This altered behavior extends to locomotor adaptation and learning, however the contributing factors to this observed behavior have yet to be investigated. OBJECTIVE: The purpose of this study was to assess differences in locomotor adaptation and learning between ACLR and controls, and identify underlying contributors to motor adaptation in these individuals...
May 1, 2018: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/29779140/knee-motion-symmetry-was-not-restored-in-patients-with-unilateral-bi-cruciate-retaining-total-knee-arthroplasty-in-vivo-three-dimensional-kinematic-analysis
#9
Paul Arauz, Yun Peng, Young-Min Kwon
PURPOSE: Although unilateral total knee arthroplasty (TKA) is successful in restoring function, there are concerns in relation to asymmetric gait patterns. Bi-cruciate retaining (BCR) TKA design preserves both anterior and posterior cruciate ligaments with the potential to restore normal joint kinematics. The purpose of this study was to investigate the in vivo three-dimensional (3D) kinematics of the knee in unilateral BCR TKA patients during gait. METHODS: Twenty-nine unilateral BCR TKA patients were evaluated for both knees during treadmill gait using a combined computer tomography and dual fluoroscopic imaging system approach...
May 19, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29778980/the-influence-of-early-or-delayed-provision-of-ankle-foot-orthoses-on-pelvis-hip-and-knee-kinematics-in-patients-with-sub-acute-stroke-a-randomized-controlled-trial
#10
Corien D M Nikamp, Job van der Palen, Hermie J Hermens, Johan S Rietman, Jaap H Buurke
BACKGROUND: Compensatory pelvis, hip- and knee movements are reported after stroke to overcome insufficient foot-clearance. Ankle-foot orthoses (AFOs) are often used to improve foot-clearance, but the optimal timing of AFO-provision post-stroke is unknown. Early AFO-provision to prevent foot-drop might decrease the development of compensatory movements, but it is unknown whether timing of AFO-provision affects post-stroke kinematics. RESEARCH QUESTIONS: 1) To compare the effect of AFO-provision at two different points in time (early versus delayed) on frontal pelvis and hip, and sagittal hip and knee kinematics in patients with sub-acute stroke...
May 16, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29778656/laxity-and-contact-forces-of-total-knee-designed-for-anatomic-motion-a-cadaveric-study
#11
Gaia Salvadore, Patrick A Meere, Matthias A Verstraete, Jan Victor, Peter S Walker
BACKGROUND: Total knee designs that attempt to reproduce more physiological knee kinematics are gaining attention given their possible improvement in functional outcomes. This study examined if a total knee designed for anatomic motion, where the soft tissue balancing was intended to replicate anatomical tibiofemoral contact forces, can more closely reproduce the laxity of the native knee. METHODS: In an ex-vivo setting, the laxity envelope of the knees from nine lower extremity specimens was measured using a rig that reproduced surgical conditions...
May 16, 2018: Knee
https://www.readbyqxmd.com/read/29778418/correlation-between-translational-and-rotational-kinematic-abnormalities-and-osteoarthritis-like-damage-in-two-in-vivo-sheep-injury-models
#12
Mehdi Shekarforoush, Jillian E Beveridge, David A Hart, Cyril B Frank, Nigel G Shrive
The relations between kinematic abnormalities and post traumatic osteoarthritis have not yet been clearly elucidated. This study was conducted to determine the finite helical axes parameters and the tibiofemoral translation vector in the knee joints of two surgically induced injury sheep models: anterior cruciate ligament and medial collateral ligament transection (ACL/MCL Tx) (n = 5) and lateral meniscectomy (n = 5). We hypothesized that morphological damage in the experimental joints would be correlated to alterations in these kinematic variables...
May 16, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29778063/comparison-of-three-dimensional-multi-segmental-foot-models-used-in-clinical-gait-laboratories
#13
Kristen Nicholson, Chris Church, Colton Takata, Tim Niiler, Brian Po-Jung Chen, Nancy Lennon, Julie P Sees, John Henley, Freeman Miller
BACKGROUND: Many skin-mounted three-dimensional multi-segmented foot models are currently in use for gait analysis. Evidence regarding the repeatability of models, including between trial and between assessors, is mixed, and there are no between model comparisons of kinematic results. RESEARCH QUESTION: This study explores differences in kinematics and repeatability between five three-dimensional multi-segmented foot models. The five models include duPont, Heidelberg, Oxford Child, Leardini, and Utah...
May 16, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29777980/trunk-postural-adjustments-medium-term-reliability-and-correlation-with-changes-of-clinical-outcomes-following-an-8-week-lumbar-stabilization-exercise-program
#14
Jean-Alexandre Boucher, Richard Preuss, Sharon M Henry, Marilee Nugent, Christian Larivière
BACKGROUND: Low back pain (LBP) has been previously associated with delayed anticipatory postural adjustments (APAs) determined by trunk muscle activation. Lumbar stabilization exercise programs (LSEP) for patients with LBP may restore the trunk neuromuscular control of the lumbar spine, and normalize APAs. This exploratory study aimed at testing the reliability of EMG and kinematics-based postural adjustment measures over an 8-week interval, assessing their sensitivity to LBP status and treatment and examining their relationship with clinical outcomes...
April 22, 2018: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29776995/kinematic-control-of-male-allen-s-hummingbird-wing-trill-over-a-range-of-flight-speeds
#15
Christopher J Clark, Emily A Mistick
Wing trills are pulsed sounds produced by modified wing feathers at one or more specific points in time during a wingbeat. Male Allen's Hummingbird ( Selasphorus sasin ) produce a sexually dimorphic 9 kHz wing trill in flight. Here we investigate the kinematic basis for trill production. The wingtip velocity hypothesis posits that trill production is modulated by the airspeed of the wingtip at some point during the wingbeat, whereas the wing rotation hypothesis posits that trill production is instead modulated by wing rotation kinematics...
May 18, 2018: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29776969/identifying-genetic-players-in-cell-sheet-morphogenesis-using-a-drosophila-deficiency-screen-for-genes-on-chromosome-2r-involved-in-dorsal-closure
#16
Richard D Mortensen, Regan P Moore, Stephanie M Fogerson, Hellen Y Chiou, Chimdindu V Obinero, Neel K Prabhu, Angela H Wei, Janice M Crawford, Daniel P Kiehart
Cell sheet morphogenesis characterizes key developmental transitions and homeostasis, in vertebrates and throughout phylogeny, including gastrulation, neural tube formation and wound healing. Dorsal closure, a process during Drosophila embryogenesis, has emerged as a model for cell sheet morphogenesis. ∼140 genes are currently known to affect dorsal closure and new genes are identified each year. Many of these genes were identified in screens that resulted in arrested development. Dorsal closure is remarkably robust and many questions regarding the molecular mechanisms involved in this complex biological process remain...
May 18, 2018: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/29775910/hip-and-patellofemoral-joint-loading-during-gait-are-increased-in-children-with-idiopathic-torsional-deformities
#17
Elyse Passmore, H Kerr Graham, Marcus G Pandy, Morgan Sangeux
BACKGROUND: Torsional deformities of the femur and tibia are associated with gait impairments and joint pain. Several studies have investigated these gait deviations in children with cerebral palsy. However, relatively little is known about gait deviations in children with idiopathic torsion and debate ensues about the management of these patients. RESEARCH QUESTION: What are the effects of idiopathic increased femoral neck anteversion and external tibial torsion on lower-limb kinematics, kinetics and joint loading during gait in children and adolescents...
May 9, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29775337/effective-inertial-frame-in-an-atom-interferometric-test-of-the-equivalence-principle
#18
Chris Overstreet, Peter Asenbaum, Tim Kovachy, Remy Notermans, Jason M Hogan, Mark A Kasevich
In an ideal test of the equivalence principle, the test masses fall in a common inertial frame. A real experiment is affected by gravity gradients, which introduce systematic errors by coupling to initial kinematic differences between the test masses. Here we demonstrate a method that reduces the sensitivity of a dual-species atom interferometer to initial kinematics by using a frequency shift of the mirror pulse to create an effective inertial frame for both atomic species. Using this method, we suppress the gravity-gradient-induced dependence of the differential phase on initial kinematic differences by 2 orders of magnitude and precisely measure these differences...
May 4, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29774947/passive-engineering-mechanism-enhancement-of-a-flexor-digitorum-longus-tendon-transfer-procedure
#19
Connor M Pihl, Christina J Stender, Ravi Balasubramanian, Kylie M Edinger, Bruce J Sangeorzan, William R Ledoux
Standard treatments of adult acquired flatfoot deformity (AAFD) fail to correct associated dysfunction of the posterior tibial tendon (PTT). This study aimed to determine if a novel passive engineering mechanism (PEM) enhanced flexor digitorum longus (FDL) tendon transfer procedure would better restore physiologic PTT function to improve AAFD gait parameters compared to standard treatment. We evaluated the kinetic, pedobarographic, and kinematic effects of a pulley-based PEM-enhancement system utilizing a cadaveric flatfoot model and robotic gait simulator...
May 18, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29774424/lingual-and-jaw-kinematic-abnormalities-precede-speech-and-swallowing-impairments-in-als
#20
Bridget J Perry, Rosemary Martino, Yana Yunusova, Emily K Plowman, Jordan R Green
Early identification of bulbar involvement in persons with ALS is critical for improving diagnosis and prognosis; however, efficacious diagnostic markers have not yet been identified. The purpose of this study was to determine whether kinematic changes of the tongue and jaw during swallowing, measured using 3D electromagnetic articulography (EMA), predate clinically identifiable symptoms of speech and swallowing impairment in persons diagnosed with ALS. Data were collected from 16 adults diagnosed with ALS and 18 neurotypical controls...
May 17, 2018: Dysphagia
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