keyword
MENU ▼
Read by QxMD icon Read
search

Adaptive motion

keyword
https://www.readbyqxmd.com/read/28626322/the-effect-of-age-on-hamstring-passive-properties-after-a-10-week-stretch-training
#1
Thomas Haab, Georg Wydra
[Purpose] Degenerative changes take place in the musculoskeletal system of elderly people, resulting in a reduced range of motion. For this reason, stretch training is recommended for elderly individuals. To date, there have been no studies of the adaptations of the passive properties of muscles following long-term stretch training. The aim of this study is to investigate the hamstring elasticity of elderly people following a 10-week stretch training and compare the results to a younger cohort. [Subjects and Methods] The experimental groups consisted of 15 younger (24...
June 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28624851/acute-effects-of-constant-torque-and-constant-angle-stretching-on-the-muscle-and-tendon-tissue-properties
#2
Andreas Konrad, Francesco Budini, Markus Tilp
PURPOSE: Static stretching induces acute structural changes of the muscle-tendon unit (MTU) that are related to the intensity or duration of stretching. It has been reported that stretching with a constant torque (CT) leads to greater joint range of motion changes than stretching with a constant angle (CA). Whether or not this difference is due to different structural changes of the MTUs of the lower leg and ankle plantar flexors is not known. Therefore, the purpose of this study was to compare the acute effects of single CA and CT stretching on various muscle and tendon mechanical properties...
June 17, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28624755/stereo-vision-based-tracking-of-soft-tissue-motion-with-application-to-online-ablation-control-in-laser-microsurgery
#3
Andreas Schoob, Dennis Kundrat, Lüder A Kahrs, Tobias Ortmaier
Recent research has revealed that image-based methods can enhance accuracy and safety in laser microsurgery. In this study, non-rigid tracking using surgical stereo imaging and its application to laser ablation is discussed. A recently developed motion estimation framework based on piecewise affine deformation modeling is extended by a mesh refinement step and considering texture information. This compensates for tracking inaccuracies potentially caused by inconsistent feature matches or drift. To facilitate online application of the method, computational load is reduced by concurrent processing and affine-invariant fusion of tracking and refinement results...
June 8, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28622670/adaptive-clutter-demodulation-for-non-contrast-ultrasound-perfusion-imaging
#4
Jaime Tierney, Crystal Coolbaugh, Theodore Towse, Brett Byram
Conventional Doppler ultrasound is useful for visualizing fast blood flow in large resolvable vessels. However, frame rate and tissue clutter caused by movement of the patient or sonographer make visualizing slow flow with ultrasound difficult. Patient and sonographer motion causes spectral broadening of the clutter signal, which limits ultrasound's sensitivity to velocities greater than 5-10mm/s for typical clinical imaging frequencies. To address this, we propose a clutter filtering technique that may increase the sensitivity of Doppler measurements to at least as low as 0...
June 13, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28619310/dance-for-parkinson-s-the-effects-on-whole-body-co-ordination-during-turning-around
#5
Sophia Hulbert, Ann Ashburn, Lisa Roberts, Geert Verheyden
OBJECTIVE: To investigate the effects of ballroom and Latin American dancing classes on turning in people with Parkinson's. DESIGN: This study employed a randomised, controlled, experimental design. SETTING: Dance classes were performed in a community dance centre in Southern England and all assessments took place a gait laboratory. PARTICIPANTS: Twenty-seven people with mild-moderate Parkinson's participated. INTERVENTION: Participants were randomly allocated to receive either 20, 1-h dancing classes over 10 weeks (n=15), or a 'usual care' control group (n=12)...
June 2017: Complementary Therapies in Medicine
https://www.readbyqxmd.com/read/28612041/structural-and-dynamic-insights-into-the-role-of-conformational-switching-in-the-nuclease-activity-of-the-xanthomonas-albilineans-cas2-in-crispr-mediated-adaptive-immunity
#6
Donghyun Ka, Suji Hong, Ugeene Jeong, Migyeong Jeong, Nayoung Suh, Jeong-Yong Suh, Euiyoung Bae
Clustered regularly interspaced short palindromic repeats (CRISPRs) and CRISPR-associated (Cas) proteins constitute a microbial, adaptive immune system countering invading nucleic acids. Cas2 is a universal Cas protein found in all types of CRISPR-Cas systems, and its role is implicated in new spacer acquisition into CRISPR loci. In subtype I-C CRISPR-Cas systems, Cas2 proteins are metal-dependent double-stranded DNA (dsDNA) nucleases, and a pH-dependent conformational transition has been proposed as a prerequisite for catalytic action...
September 2017: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/28609300/a-new-method-to-reconstruct-intra-fractional-prostate-motion-in-volumetric-modulated-arc-therapy
#7
Y Chi, N H Rezaeian, C Shen, Y Zhou, W Lu, M Yang, R Hannan, X Jia
Intra-fractional motion is a concern during prostate radiation therapy, as it may cause deviations between planned and delivered radiation doses. Because accurate motion information during treatment delivery is critical to address dose deviation, we developed the projection marker matching method (PM(3)), a novel method for prostate motion reconstruction in volumetric modulated arc therapy. The purpose of this method is to reconstruct in-treatment prostate motion trajectory using projected positions of implanted fiducial markers measured in kV x-ray projection images acquired during treatment delivery...
July 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28607486/a-retinal-code-for-motion-along-the-gravitational-and-body-axes
#8
Shai Sabbah, John A Gemmer, Ananya Bhatia-Lin, Gabrielle Manoff, Gabriel Castro, Jesse K Siegel, Nathan Jeffery, David M Berson
Self-motion triggers complementary visual and vestibular reflexes supporting image-stabilization and balance. Translation through space produces one global pattern of retinal image motion (optic flow), rotation another. We examined the direction preferences of direction-sensitive ganglion cells (DSGCs) in flattened mouse retinas in vitro. Here we show that for each subtype of DSGC, direction preference varies topographically so as to align with specific translatory optic flow fields, creating a neural ensemble tuned for a specific direction of motion through space...
June 7, 2017: Nature
https://www.readbyqxmd.com/read/28606179/modifying-upper-limb-inter-joint-coordination-in-healthy-subjects-by-training-with-a-robotic-exoskeleton
#9
Tommaso Proietti, Emmanuel Guigon, Agnès Roby-Brami, Nathanaël Jarrassé
BACKGROUND: The possibility to modify the usually pathological patterns of coordination of the upper-limb in stroke survivors remains a central issue and an open question for neurorehabilitation. Despite robot-led physical training could potentially improve the motor recovery of hemiparetic patients, most of the state-of-the-art studies addressing motor control learning, with artificial virtual force fields, only focused on the end-effector kinematic adaptation, by using planar devices...
June 12, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28604833/chest-mri-under-pulsatile-flow-ventilation-a-new-promising-technique
#10
Catherine Beigelman-Aubry, Nicolas Peguret, Matthias Stuber, Jean Delacoste, Bastien Belmondo, Alban Lovis, Julien Simons, Olivier Long, Kathleen Grant, Gregoire Berchier, Chantal Rohner, Gabriele Bonanno, Simone Coppo, Juerg Schwitter, Mahmut Ozsahin, Salah Qanadli, Reto Meuli, Jean Bourhis
OBJECTIVES: Magnetic resonance imaging (MRI) of the chest has long suffered from its sensitivity to respiratory and cardiac motion with an intrinsically low signal to noise ratio and a limited spatial resolution. The purpose of this study was to perform chest MRI under an adapted non invasive pulsatile flow ventilation system (high frequency percussive ventilation, HFPV®) allowing breath hold durations 10 to 15 times longer than other existing systems. METHODS: One volunteer and one patient known for a thymic lesion underwent a chest MRI under ventilation percussion technique (VP-MR)...
2017: PloS One
https://www.readbyqxmd.com/read/28603874/impact-of-rest-duration-on-achilles-tendon-structure-and-function-following-isometric-training
#11
C M Waugh, T Alktebi, A de Sa, A Scott
Intervention programs are often sought to strengthen the Achilles tendon (AT) due to its high injury rate. Long rest periods between loading cycles have been found to increase collagen synthesis by tenocytes, suggesting rest duration may be important for tendon adaptation in vivo, however exercise programs comparing long and short rest duration have not been directly compared. Fourteen adults completed a 12-week progressive training intervention; training sessions consisted of 5 x 10 isometric plantarflexion contractions each of 3-s duration performed at 90% of MVC three times weekly...
June 12, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28602943/in-vivo-b0-field-shimming-methods-for-mri-at-7-t
#12
Jason P Stockmann, Lawrence L Wald
Functional MRI (fMRI) at 7 T and above provides improved Signal-to-Noise Ratio and Contrast-to-Noise Ratio compared to 3 T acquisitions. In addition to the beneficial effects on spin polarization and magnetization of deoxyhemoglobin, the increased applied field also further magnetizes air and tissue. While the magnets themselves typically provide a static B0 field with sufficient spatial homogeneity, the diamagnetism of tissue and the paramagnetism of air causes local field deviations inside the human head...
June 7, 2017: NeuroImage
https://www.readbyqxmd.com/read/28599014/effect-of-the-alexander-technique-on-muscle-activation-movement-kinematics-and-performance-quality-in-collegiate-violinists-and-violists-a-pilot-feasibility-study
#13
Rachelle C Wolf, Harvey P Thurmer, William P Berg, Henry E Cook, L James Smart
Musicians are trained to attend to aural and visual senses, to the detriment of kinesthetic awareness, which often results in unnecessary muscle tension and narrowed attentional focus. The Alexander technique (AT) addresses these concerns by approaching action using a process of whole-body consciousness. Incorporation of AT concepts into skill practice may reduce static tension in playing and result in both prevention of injury and improved quality of performance, but objective evidence of these effects is lacking...
June 2017: Medical Problems of Performing Artists
https://www.readbyqxmd.com/read/28594068/chimpanzee-ankle-and-foot-joint-kinematics-arboreal-versus-terrestrial-locomotion
#14
Nicholas B Holowka, Matthew C O'Neill, Nathan E Thompson, Brigitte Demes
OBJECTIVES: Many aspects of chimpanzee ankle and midfoot joint morphology are believed to reflect adaptations for arboreal locomotion. However, terrestrial travel also constitutes a significant component of chimpanzee locomotion, complicating functional interpretations of chimpanzee and fossil hominin foot morphology. Here we tested hypotheses of foot motion and, in keeping with general assumptions, we predicted that chimpanzees would use greater ankle and midfoot joint ranges of motion during travel on arboreal supports than on the ground...
June 8, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28592689/control-of-the-strength-of-visual-motor-transmission-as-the-mechanism-of-rapid-adaptation-of-priors-for-bayesian-inference-in-smooth-pursuit-eye-movements
#15
Timothy Darlington, Stefanie Tokiyama, Stephen G Lisberger
Bayesian inference provides a cogent account of how the brain combines sensory information with "priors" based on past experience to guide many behaviors, including smooth pursuit eye movements. We now demonstrate very rapid adaptation of the pursuit system's priors for target direction and speed. We go on to leverage that adaptation to outline possible neural mechanisms that could cause pursuit to show features consistent with Bayesian inference. Adaptation of the prior causes changes in the eye speed and direction at the initiation of pursuit...
June 7, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28592663/inspiration-for-wing-design-how-forelimb-specialization-enables-active-flight-in-modern-vertebrates
#16
REVIEW
Diana D Chin, Laura Y Matloff, Amanda Kay Stowers, Emily R Tucci, David Lentink
Harnessing flight strategies refined by millions of years of evolution can help expedite the design of more efficient, manoeuvrable and robust flying robots. This review synthesizes recent advances and highlights remaining gaps in our understanding of how bird and bat wing adaptations enable effective flight. Included in this discussion is an evaluation of how current robotic analogues measure up to their biological sources of inspiration. Studies of vertebrate wings have revealed skeletal systems well suited for enduring the loads required during flight, but the mechanisms that drive coordinated motions between bones and connected integuments remain ill-described...
June 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28589629/observation-of-various-and-spontaneous-magnetic-skyrmionic-bubbles-at-room-temperature-in-a-frustrated-kagome-magnet-with-uniaxial-magnetic-anisotropy
#17
Zhipeng Hou, Weijun Ren, Bei Ding, Guizhou Xu, Yue Wang, Bing Yang, Qiang Zhang, Ying Zhang, Enke Liu, Feng Xu, Wenhong Wang, Guangheng Wu, Xixiang Zhang, Baogen Shen, Zhidong Zhang
The quest for materials hosting topologically protected skyrmionic spin textures continues to be fueled by the promise of novel devices. Although many materials have demonstrated the existence of such spin textures, major challenges remain to be addressed before devices based on magnetic skyrmions can be realized. For example, being able to create and manipulate skyrmionic spin textures at room temperature is of great importance for further technological applications because they can adapt to various external stimuli acting as information carriers in spintronic devices...
June 7, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28587761/itv-mid-ventilation-gating-or-couch-tracking-a-comparison-of-respiratory-motion-management-techniques-based-on-4d-dose-calculations
#18
Stefanie Ehrbar, Alexander Jöhl, Adrianna Tartas, Luisa Sabrina Stark, Oliver Riesterer, Stephan Klöck, Matthias Guckenberger, Stephanie Tanadini-Lang
PURPOSE: Respiratory motion-management techniques (MMT) aim to ensure tumor dose coverage while sparing lung tissue. Dynamic treatment-couch tracking of the moving tumor is a promising new MMT and was compared to the internal-target-volume (ITV) concept, the mid-ventilation (MidV) principle and the gating approach in a planning study based on 4D dose calculations. METHODS: For twenty patients with lung lesions, planning target volumes (PTV) were adapted to the MMT and stereotactic body radiotherapy treatments were prepared with the 65%-isodose enclosing the PTV...
June 3, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28585963/self-adapted-and-tunable-graphene-strain-sensors-for-detecting-both-subtle-and-large-human-motions
#19
Lu-Qi Tao, Dan-Yang Wang, He Tian, Zhen-Yi Ju, Ying Liu, Yu Pang, Yuan-Quan Chen, Yi Yang, Tian-Ling Ren
Conventional strain sensors rarely have both a high gauge factor and a large strain range simultaneously, so they can only be used in specific situations where only a high sensitivity or a large strain range is required. However, for detecting human motions that include both subtle and large motions, these strain sensors can't meet the diverse demands simultaneously. Here, we come up with laser patterned graphene strain sensors with self-adapted and tunable performance for the first time. A series of strain sensors with either an ultrahigh gauge factor or a preferable strain range can be fabricated simultaneously via one-step laser patterning, and are suitable for detecting all human motions...
June 6, 2017: Nanoscale
https://www.readbyqxmd.com/read/28585281/the-deep-fascia-and-retinacula-of-the-equine-forelimb-structure-and-innervation
#20
Aleksandra Skalec, Monika Egerbacher
Recent advances in human fascia research have shed new light on the role of the fascial network in movement perception and coordination, transmission of muscle force, and integrative function in body biomechanics. Evolutionary adaptations of equine musculoskeletal apparatus that assure effective terrestrial locomotion are employed in equestrianism, resulting in the wide variety of movements in performing horses, from sophisticated dressage to jumping and high-speed racing. The high importance of horse motion efficiency in the present-day equine industry indicates the significance of scientific knowledge of the structure and physiology of equine fasciae...
June 5, 2017: Journal of Anatomy
keyword
keyword
96818
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"