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https://www.readbyqxmd.com/read/28742605/predictors-of-the-biomechanical-effects-of-customized-foot-orthoses-in-adults-with-flat-arched-feet
#1
John B Arnold, Thomas May, Christopher Bishop
OBJECTIVE: To determine the potential presence and characteristics of biomechanical responders to customized foot orthoses during walking in adults with flat-arched feet. DESIGN: Experimental, repeated-measures. SETTING: University clinic and laboratory. PARTICIPANTS: Eighteen symptom-free adults with flat-arched feet. INTERVENTIONS: Customized foot orthoses. MAIN OUTCOME MEASURES: In-shoe foot biomechanics were measured during walking with and without customized foot orthoses using 3D analysis...
July 21, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28742277/the-immediate-and-short-term-effects-of-real-time-knee-adduction-moment-feedback-on-the-peak-and-cumulative-knee-load-during-walking
#2
Brennan Jackson, Keith E Gordon, Alison H Chang
The peak external knee adduction moment (pKAM), KAM impulse, and peak knee flexion moment (pKFM) during gait are important loading variables in medial tibiofemoral osteoarthritis. We evaluated the effects of gait modification, using real-time pKAM visual feedback, on pKAM, KAM impulse, and pKFM; and whether participants could maintain the KAM-reducing gait after feedback removal. Eleven healthy individuals performed a series of walking trials on a split-belt instrumented treadmill under 4 conditions of Baseline, Feedback, No Feedback Early, and No Feedback Late...
July 25, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28741277/analysis-of-subjects-vulnerability-in-a-touch-screen-game-using-behavioral-metrics
#3
Payam Parsinejad, Rifat Sipahi
In this article, we report results on an experimental study conducted with volunteer subjects playing a touch-screen game with two unique difficulty levels. Subjects have knowledge about the rules of both game levels, but only sufficient playing experience with the easy level of the game, making them vulnerable with the difficult level. Several behavioral metrics associated with subjects' playing the game are studied in order to assess subjects' mental-workload changes induced by their vulnerability. Specifically, these metrics are calculated based on subjects' finger kinematics and decision making times, which are then compared with baseline metrics, namely, performance metrics pertaining to how well the game is played and a physiological metric called pnn50 extracted from heart rate measurements...
July 24, 2017: Applied Psychophysiology and Biofeedback
https://www.readbyqxmd.com/read/28738088/virtual-daily-living-test-to-screen-for-mild-cognitive-impairment-using-kinematic-movement-analysis
#4
Kyoungwon Seo, Jae-Kwan Kim, Dong Hoon Oh, Hokyoung Ryu, Hojin Choi
Questionnaires or computer-based tests for assessing activities of daily living are well-known approaches to screen for mild cognitive impairment (MCI). However, questionnaires are subjective and computerized tests only collect simple performance data with conventional input devices such as a mouse and keyboard. This study explored the validity and discriminative power of a virtual daily living test as a new diagnostic approach to assess MCI. Twenty-two healthy controls and 20 patients with MCI were recruited...
2017: PloS One
https://www.readbyqxmd.com/read/28737516/pre-therapy-neural-state-of-bilateral-motor-and-premotor-cortices-predicts-therapy-gain-after-subcortical-stroke-a-pilot-study
#5
Carmen M Cirstea, Phil Lee, Sorin C Craciunas, In-Young Choi, Joseph E Burris, Randolph J Nudo
OBJECTIVE: The aim of the study was to examine whether neural state of spared motor and premotor cortices captured before a therapy predicts therapy-related motor gains in chronic subcortical stroke. DESIGN: Ten survivors, presenting chronic moderate upper limb impairment, underwent proton magnetic resonance spectroscopy, magnetic resonance imaging, clinical, and kinematics assessments before a 4-wk impairment-oriented training. Clinical/kinematics assessments were repeated after therapy, and motor gain was defined as positive values of clinical upper limb/elbow motion changes and negative values of trunk motion changes...
July 22, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28736463/viscosity-density-and-thermal-conductivity-of-aluminum-oxide-and-zinc-oxide-nanolubricants
#6
M A Kedzierski, R Brignoli, K T Quine, J S Brown
This paper presents liquid kinematic viscosity, density, and thermal conductivity measurements of eleven different synthetic polyolester-based nanoparticle nanolubricants (dispersions) at atmospheric pressure over the temperature range 288 K to 318 K. Aluminum oxide (Al2O3) and zinc oxide (ZnO) nanoparticles with nominal diameters of 127 nm and 135 nm, respectively, were investigated. A good dispersion of the spherical and non-spherical nanoparticles in the lubricant was maintained with a surfactant. Viscosity, density, and thermal conductivity measurements were made for the neat lubricant along with eleven nanolubricants with differing nanoparticle and surfactant mass fractions...
February 2017: Revue Internationale du Froid
https://www.readbyqxmd.com/read/28736210/effects-of-positive-expiratory-pressure-on-chest-wall-volumes-in-subjects-with-stroke-compared-to-healthy-controls-a-case-control-study
#7
Elis E A Cabral, Vanessa R Resqueti, Illia N D F Lima, Lucien P Gualdi, Andrea Aliverti, Guilherme A F Fregonezi
BACKGROUND: Alterations in respiratory system kinematics in stroke lead to restrictive pattern associated with decreased lung volumes. Chest physical therapy, such as positive expiratory pressure, may be useful in the treatment of these patients; however, the optimum intensity to promote volume and motion changes of the chest wall remains unclear. OBJECTIVE: To assess the effect of different intensities of positive expiratory pressure on chest wall kinematics in subjects with stroke compared to healthy controls...
July 8, 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28736080/the-effect-of-ankle-foot-orthosis-alignment-on-walking-in-individuals-treated-for-traumatic-lower-extremity-injuries
#8
Starr E Brown, Elizabeth Russell Esposito, Jason M Wilken
Limb salvage surgeries are performed to treat a variety of lower limb pathologies and traumatic injuries. Individuals who have undergone limb salvage surgeries may require an ankle foot orthosis (AFO) to compensate for limb impairments and restore walking ability. Understanding the effects of AFO design parameters on gait biomechanics is important to refine AFO prescription criteria. In this study sagittal plane kinematic and kinetic data, muscle activity and alignment preference were examined as individuals treated for traumatic lower extremity injuries (N=12) walked over level ground with Plantarflexed (PF), Neutral, and Dorsiflexed (DF) aligned AFOs...
July 5, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28735794/influence-of-different-kinematics-on-apical-extrusion-of-irrigant-and-debris-during-canal-preparation-using-k3xf-instruments
#9
Mustafa Toyoğlu, Demet Altunbaş
INTRODUCTION: This in vitro study was designed to evaluate the amount of apically extruded irrigant and debris during root canal preparation using K3XF instruments (SybronEndo, Orange, CA) with different kinematics and using hand files with a step-back technique. METHODS: A total of 80 extracted mandibular premolars were selected and randomly assigned to 4 groups (n = 20). The root canals were instrumented with K-type stainless steel instruments using a step-back technique and with the K3XF system using the following kinematics: reciprocating motion, adaptive motion, and continuous rotation...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28735202/effect-of-wii-fit%C3%A2-exercise-therapy-on-gait-parameters-in-ankle-sprain-patients-a-randomized-controlled-trial
#10
Ilona M Punt, Stéphane Armand, Jean-Luc Ziltener, Lara Allet
Ankle sprains are the most common sport related injuries. An alternative to physical therapy in the treatment of ankle sprains is home based exercise therapy. This study aims to compare the effectiveness of Wii Fit™ exercise therapy in ankle sprain patients on temporal-spatial and kinematic gait parameters with a) conventional therapy and b) a control group not receiving exercise therapy. Ninety patients were randomly assigned to a Wii Fit™, physical therapy or control group. Temporal-spatial and kinematic gait parameters were assessed at baseline, 6 weeks and 6 months follow-up...
June 29, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28735178/development-of-a-real-time-prediction-model-of-driver-behavior-at-intersections-using-kinematic-time-series-data
#11
Yaoyuan V Tan, Michael R Elliott, Carol A C Flannagan
As connected autonomous vehicles (CAVs) enter the fleet, there will be a long period when these vehicles will have to interact with human drivers. One of the challenges for CAVs is that human drivers do not communicate their decisions well. Fortunately, the kinematic behavior of a human-driven vehicle may be a good predictor of driver intent within a short time frame. We analyzed the kinematic time series data (e.g., speed) for a set of drivers making left turns at intersections to predict whether the driver would stop before executing the turn...
July 20, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/28734700/predicting-muscle-forces-during-the-propulsion-phase-of-single-leg-triple-hop-test
#12
Felipe Costa Alvim, Paulo Roberto Garcia Lucareli, Luciano Luporini Menegaldo
Functional biomechanical tests allow the assessment of musculoskeletal system impairments in a simple way. Muscle force synergies associated with movement can provide additional information for diagnosis. However, such forces cannot be directly measured noninvasively. This study aims to estimate muscle activations and forces exerted during the preparation phase of the single leg triple hop test. Two different approaches were tested: static optimization (SO) and computed muscle control (CMC). As an indirect validation, model-estimated muscle activations were compared with surface electromyography (EMG) of selected hip and thigh muscles...
July 15, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28734544/lower-limb-joint-work-and-joint-work-contribution-during-downhill-and-uphill-walking-at-different-inclinations
#13
Nathalie Alexander, Gerda Strutzenberger, Lisa Maria Ameshofer, Hermann Schwameder
Work performance and individual joint contribution to total work are important information for creating training protocols, but were not assessed so far for sloped walking. Therefore, the purpose of this study was to analyze lower limb joint work and joint contribution of the hip, knee and ankle to total lower limb work during sloped walking in a healthy population. Eighteen male participants (27.0±4.7yrs, 1.80±0.05m, 74.5±8.2kg) walked on an instrumented ramp at inclination angles of 0°, ±6°, ±12° and ±18° at 1...
July 11, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28734543/crouch-severity-is-a-poor-predictor-of-elevated-oxygen-consumption-in-cerebral-palsy
#14
Katherine M Steele, Benjamin R Shuman, Michael H Schwartz
Children with cerebral palsy (CP) expend more energy to walk compared to typically-developing peers. One of the most prevalent gait patterns among children with CP, crouch gait, is often singled out as especially exhausting. The dynamics of crouch gait increase external flexion moments and the demand on extensor muscles. This elevated demand is thought to dramatically increase energy expenditure. However, the impact of crouch severity on energy expenditure has not been investigated among children with CP. We evaluated oxygen consumption and gait kinematics for 573 children with bilateral CP...
July 5, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28733770/distinct-and-flexible-rates-of-online-control
#15
John de Grosbois, Luc Tremblay
Elliott et al. (Hum Mov Sci 10:393-418, 1991) proposed a pseudocontinuous model of online control whereby overlapping corrections lead to the appearance of smooth kinematic profiles in the presence of online feedback. More recently, it was also proposed that online control is not a singular process [see Elliott et al. (Psychol Bull 136(6):1023-1044, 2010)]. However, support for contemporary models of online control were based on methodologies that were not designed to be sensitive to different online control sub-processes...
July 21, 2017: Psychological Research
https://www.readbyqxmd.com/read/28733769/communication-for-coordination-gesture-kinematics-and-conventionality-affect-synchronization-success-in-piano-duos
#16
Laura Bishop, Werner Goebl
Ensemble musicians often exchange visual cues in the form of body gestures (e.g., rhythmic head nods) to help coordinate piece entrances. These cues must communicate beats clearly, especially if the piece requires interperformer synchronization of the first chord. This study aimed to (1) replicate prior findings suggesting that points of peak acceleration in head gestures communicate beat position and (2) identify the kinematic features of head gestures that encourage successful synchronization. It was expected that increased precision of the alignment between leaders' head gestures and first note onsets, increased gesture smoothness, magnitude, and prototypicality, and increased leader ensemble/conducting experience would improve gesture synchronizability...
July 21, 2017: Psychological Research
https://www.readbyqxmd.com/read/28733722/non-specific-chronic-low-back-pain-differences-in-spinal-kinematics-in-subgroups-during-functional-tasks
#17
Rebecca Hemming, Liba Sheeran, Robert van Deursen, Valerie Sparkes
PURPOSE: A multidimensional classification approach suggests that motor control impairment subgroups exist in non-specific chronic low back pain (NSCLBP). Differences in sitting lumbar posture have been identified between two such subgroups [flexion pattern (FP) and active extension pattern (AEP)] and healthy individuals; however, functional spinal movement has not been explored. This study will evaluate whether NSCLBP subgroups exhibit regional spinal kinematic differences, compared to healthy individuals, during functional tasks...
July 21, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28732140/fibroblast-growth-factor-2-fgf2-is-present-in-human-spermatozoa-and-is-related-with-sperm-motility-the-use-of-recombinant-fgf2-to-improve-motile-sperm-recovery
#18
D J Garbarino Azúa, L Saucedo, S Giordana, M L Magri, M G Buffone, F Neuspiller, M H Vazquez-Levin, C I Marín-Briggiler
Fibroblast growth factors (FGFs) and their receptors (FGFRs) regulate several functions of somatic cells. In a previous work, we reported FGFR expression in human spermatozoa and their involvement in motility. This study aimed to evaluate the presence and localization of fibroblast growth factor 2 (FGF2) in human spermatozoa, to determine the relationship of FGF2 levels with conventional semen parameters and to assess the effect of recombinant FGF2 (rFGF2) on sperm recovery in a selection procedure. Western immunoblotting analysis using an antibody against FGF2 revealed an 18-kDa band in sperm protein extracts...
July 21, 2017: Andrology
https://www.readbyqxmd.com/read/28731751/inferences-about-supernova-physics-from-gravitational-wave-measurements-gw151226-spin-misalignment-as-an-indicator-of-strong-black-hole-natal-kicks
#19
Richard O'Shaughnessy, Davide Gerosa, Daniel Wysocki
The inferred parameters of the binary black hole GW151226 are consistent with nonzero spin for the most massive black hole, misaligned from the binary's orbital angular momentum. If the black holes formed through isolated binary evolution from an initially aligned binary star, this misalignment would then arise from a natal kick imparted to the first-born black hole at its birth during stellar collapse. We use simple kinematic arguments to constrain the characteristic magnitude of this kick, and find that a natal kick v_{k}≳50  km/s must be imparted to the black hole at birth to produce misalignments consistent with GW151226...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28730946/contribution-of-upper-limb-muscles-to-two-different-gripping-styles-in-elite-indoor-tug-of-war-athletes
#20
Wen-Tzu Tang, Wei-Chih Liao, Hsin-Min Lee
To investigate characteristic upper limb muscle use between two common tug of war (TOW) gripping styles, 20 elite athletes from two high school TOW teams were recruited. Under conditioned attack pulling (with 90% maximal force) on a tug machine, participants used their own habitual gripping style to pull for five 15-s trials. Force and kinematic measurements showed a significantly better force performance and higher centre-of-gravity tilting angle with the gripping style one than with the gripping style two (GS2) (both p < 0...
July 21, 2017: Sports Biomechanics
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