keyword
MENU ▼
Read by QxMD icon Read
search

Dynamic seating

keyword
https://www.readbyqxmd.com/read/29673204/older-adults-with-weaker-muscle-strength-stand-up-from-a-sitting-position-with-more-dynamic-trunk-use
#1
Rob C van Lummel, Jordi Evers, Martijn Niessen, Peter J Beek, Jaap H van Dieën
The ability to stand up from a sitting position is essential for older adults to live independently. Body-fixed inertial sensors may provide an approach for quantifying the sit-to-stand (STS) in clinical settings. The aim of this study was to determine whether measurements of STS movements using body-fixed sensors yield parameters that are informative regarding changes in STS performance in older adults with reduced muscle strength. In twenty-seven healthy older adults, handgrip strength was assessed as a proxy for overall muscle strength...
April 17, 2018: Sensors
https://www.readbyqxmd.com/read/29651902/shoulder-and-lower-back-joint-reaction-forces-in-seated-double-poling
#2
Marie Lund Ohlsson, Jonas Danvind, L Joakim Holmberg
Overuse injuries in the shoulders and lower back are hypothesized to be common in cross-country sit-skiing. Athletes with reduced trunk muscle control mainly sits with their knees higher than hips (KH). To reduce spinal flexion, a position with the knees below the hips (KL) was enabled for these athletes using a frontal trunk support. The aim of the study was to compare the shoulder joint (glenohumeral joint) and L4-L5 joint reactions between the sitting positions KL and KH. Five able-bodied female athletes performed submaximal and maximal exercise tests in the sitting positions KL and KH on a ski-ergometer...
April 13, 2018: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29651039/comprehensive-modeling-of-multimode-fiber-sensors-for-refractive-index-measurement-and-experimental-validation
#3
Haris Apriyanto, Gautier Ravet, Olivier D Bernal, Michel Cattoen, Han Cheng Seat, Valérie Chavagnac, Frederic Surre, James H Sharp
We propose and develop a comprehensive model for estimating the refractive index (RI) response over three potential sensing zones in a multimode fiber. The model has been developed based on a combined ray optics, Gaussian beam, and wave optics analysis coupled to the consideration of the injected interrogating lightwave characteristics and validated experimentally through the realization of three sensors with different lengths of stripped cladding sections as the sensing region. The experimental results highly corroborate and validate the simulation output from the model for the three RI sensing zones...
April 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29625190/sacroiliac-joint-dysfunction-patients-exhibit-altered-movement-strategies-when-performing-a-sit-to-stand-task
#4
Robyn A Capobianco, Daniel F Feeney, Jana R Jeffers, Erika Nelson-Wong, Joseph Morreale, Alena M Grabowski, Roger M Enoka
OF BACKGROUND DATA: The ability to rise from a chair is a basic functional task that is frequently compromised in individuals diagnosed with orthopedic disorders in the low back and hip. There is no published literature that describes how this task is altered by sacroiliac joint dysfunction (SIJD). PURPOSE: To compare lower extremity biomechanics and the onset of muscle activity when rising from a chair in individuals with SIJD and healthy persons. STUDY DESIGN: Six women with unilateral SIJD and six age-matched healthy controls performed a sit-to-stand task while we measured kinematics, kinetics, and muscle activity...
April 3, 2018: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29614467/trunk-motion-visual-feedback-during-walking-improves-dynamic-balance-in-older-adults-assessor-blinded-randomized-controlled-trial
#5
Eric Anson, Lei Ma, Tippawan Meetam, Elizabeth Thompson, Roshita Rathore, Victoria Dean, John Jeka
BACKGROUND: Virtual reality and augmented feedback have become more prevalent as training methods to improve balance. Few reports exist on the benefits of providing trunk motion visual feedback (VFB) during treadmill walking, and most of those reports only describe within session changes. RESEARCH QUESTION: To determine whether trunk motion VFB treadmill walking would improve over-ground balance for older adults with self-reported balance problems. METHODS: 40 adults (75...
March 28, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29609660/ginger-zingiber-officinale-phytochemicals-gingerenone-a-and-shogaol-inhibit-sahppk-molecular-docking-molecular-dynamics-simulations-and-in-vitro-approaches
#6
Shailima Rampogu, Ayoung Baek, Rajesh Goud Gajula, Amir Zeb, Rohit S Bavi, Raj Kumar, Yongseong Kim, Yong Jung Kwon, Keun Woo Lee
BACKGROUND: Antibiotic resistance is a defense mechanism, harbored by pathogens to survive under unfavorable conditions. Among several antibiotic resistant microbial consortium, Staphylococcus aureus is one of the most havoc microorganisms. Staphylococcus aureus encodes a unique enzyme 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase (SaHPPK), against which, none of existing antibiotics have been reported. METHODS: Computational approaches have been instrumental in designing and discovering new drugs for several diseases...
April 2, 2018: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/29584491/active-muscle-response-contributes-to-increased-injury-risk-of-lower-extremity-in-occupant-knee-airbag-interaction
#7
Bingbing Nie, Deepak Sathyanarayan, Xin Ye, Jeff R Crandall, Matthew B Panzer
OBJECTIVE: Recent field data analysis has demonstrated that knee airbags (KABs) can reduce occupant femur and pelvis injuries but may be insufficient to decrease leg injuries in motor vehicle crashes. An enhanced understanding of the associated injury mechanisms requires accurate assessment of physiological-based occupant parameters, some of which are difficult or impossible to obtain from experiments. This study sought to explore how active muscle response can influence the injury risk of lower extremities during KAB deployment using computational biomechanical analysis...
February 28, 2018: Traffic Injury Prevention
https://www.readbyqxmd.com/read/29581930/an-improved-method-for-rapid-analysis-of-promoters-using-modified-sonication-assisted-transient-assay
#8
Chetan Chauhan, Gauri Joshi, Darshna Chaudhary, Sandip Das
We present here a modified, sonication-assisted transient transformation assay for rapid analysis of cis-regulatory elements. We tested promoter elements from MIR159B locus of Brassica juncea by generating stable transgenic lines and compared the transcriptional activity of GUS reporter with that of the transient assay method. To obtain reliable and repeatable results, and to omit false-positive data, we optimized several parameters including sonication duration and cycle and concentration of Agrobacterium tumefaciens measured as optical density (O...
April 2018: 3 Biotech
https://www.readbyqxmd.com/read/29570057/vital-sign-monitoring-through-the-back-using-an-uwb-impulse-radar-with-body-coupled-antennas
#9
Elliott Schires, Pantelis Georgiou, Tor Sverre Lande
Radar devices can be used in nonintrusive situations to monitor vital sign, through clothes or behind walls. By detecting and extracting body motion linked to physiological activity, accurate simultaneous estimations of both heart rate (HR) and respiration rate (RR) is possible. However, most research to date has focused on front monitoring of superficial motion of the chest. In this paper, body penetration of electromagnetic (EM) wave is investigated to perform back monitoring of human subjects. Using body-coupled antennas and an ultra-wideband (UWB) pulsed radar, in-body monitoring of lungs and heart motion was achieved...
April 2018: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/29562965/tibia-bone-microvascular-flow-dynamics-as-compared-to-anterior-tibial-artery-flow-during-body-tilt
#10
Rachel L Becker, Jamila H Siamwala, Brandon R Macias, Alan R Hargens
BACKGROUND: We compared microvascular and macrovascular blood flows of the tibia and anterior tibial artery during graded whole-body tilt. We hypothesized equal responses for bone microvascular and macrovascular blood flows during varying angles of tilt. METHODS: There were 18 volunteers who were randomly positioned in the following postures: supine, 15° head-up tilt, 6° head-up tilt, 6° head-down tilt, and 15° head-down tilt using an inversion table with reference to seated posture (baseline control)...
April 1, 2018: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29557988/personalized-botulinum-toxin-type-a-therapy-for-cervical-dystonia-based-on-kinematic-guidance
#11
Olivia Samotus, Jack Lee, Mandar Jog
BACKGROUND: Botulinum toxin type A (BoNT-A) injections is the accepted first-line therapy for cervical dystonia (CD), however, numerous patients discontinue treatment early due to perceived sub-optimal relief. To improve BoNT-A therapy for CD, proper assessment of neck motion and selection of relevant muscles and dosing must be met. Kinematic technology may improve treatment outcomes by guiding physicians to better tailor muscle selection and BoNT-A dosing for CD therapy. METHODS: 28 CD participants were placed into either group: expert injector determined injection patterns by visual assessment ("vb") versus injection patterns based on kinematics interpreted by an expert injector ("kb")...
March 20, 2018: Journal of Neurology
https://www.readbyqxmd.com/read/29555754/behaviors-movements-and-transmission-of-droplet-mediated-respiratory-diseases-during-transcontinental-airline-flights
#12
Vicki Stover Hertzberg, Howard Weiss, Lisa Elon, Wenpei Si, Sharon L Norris
With over 3 billion airline passengers annually, the inflight transmission of infectious diseases is an important global health concern. Over a dozen cases of inflight transmission of serious infections have been documented, and air travel can serve as a conduit for the rapid spread of newly emerging infections and pandemics. Despite sensational media stories and anecdotes, the risks of transmission of respiratory viruses in an airplane cabin are unknown. Movements of passengers and crew may facilitate disease transmission...
March 19, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29541330/central-hemodynamics-measured-during-5-repetition-maximum-free-weight-resistance-exercise
#13
Jonathan S Howard, Cherilyn N McLester, Thomas W Evans, John R McLester, Jimmy P Calloway
The PhysioFlow™ is a piece of equipment that uses bioimpedance cardiography to measure central hemodynamics. The purpose of this research was to explore the novel approach of monitoring central hemodynamics during free weight resistance exercise using bioimpedance cardiography throughout a 5 repetition maximum (5RM). Thirty participants ranging from beginner to advanced lifters (16 males and 14 females) completed a 5RM for back squat, seated push press, and bicep curl while connected to the PhysioFlow™ to assess the response of heart rate (HR), stroke volume (SV), cardiac output (Q), and ejection fraction (EF)...
2018: International Journal of Exercise Science
https://www.readbyqxmd.com/read/29528603/evaluation-of-agricultural-tractor-seat-comfort-with-a-new-protocol-based-on-pressure-distribution-assessment
#14
Marco Bordignon, Maurizio Cutini, Carlo Bisaglia, Paolo Taboga, Francesco Marcolin
Professional drivers have been found to be at a high risk of developing low back pain due to prolonged sitting and vehicle vibration. In a previous survey carried out on 1,155 tractor drivers, tractor vibration and/or incorrect posture while driving were found to cause low back disorders in more than 80% of the interviewed drivers. In this context, the present research introduces a new evaluation protocol to assess the ergonomic characteristics of agricultural tractor seats through the use of pressure sensors, taking into account both static and dynamic conditions...
January 29, 2018: Journal of Agricultural Safety and Health
https://www.readbyqxmd.com/read/29394436/optimizing-seat-belt-and-airbag-designs-for-rear-seat-occupant-protection-in-frontal-crashes
#15
Jingwen Hu, Matthew P Reed, Jonathan D Rupp, Kurt Fischer, Paul Lange, Angelo Adler
Recent field data have shown that the occupant protection in vehicle rear seats failed to keep pace with advances in the front seats likely due to the lack of advanced safety technologies. The objective of this study was to optimize advanced restraint systems for protecting rear seat occupants with a range of body sizes under different frontal crash pulses. Three series of sled tests (baseline tests, advanced restraint trial tests, and final tests), MADYMO model validations against a subset of the sled tests, and design optimizations using the validated models were conducted to investigate rear seat occupant protection with 4 Anthropomorphic Test Devices (ATDs) and 2 crash pulses...
November 2017: Stapp Car Crash Journal
https://www.readbyqxmd.com/read/29326906/a-comparison-of-ground-reaction-force-components-according-to-the-foothold-heights-in-16-t-truck-during-downward-step
#16
Seung-Hyun Hyun, Che-Cheong Ryew
The aim of this study is to compare and analyze the components of ground reaction force (GRF) relative to the foothold heights during downward step of 16-t truck. Adult males (n= 10) jumped downward from each 1st, 2nd, 3rd foothold step and driver's seat orderly using hand rail. Sampling rate of force components of 3 axis (medial-lateral [ML] GRF, anterior-posterior [AP] GRF, peak vertical force [PVF]), variables (COPx, COPy, COP area) of center of pressure (COP), loading rate, and stability index (ML, AP, vertical, and dynamic postural stability index [DPSI]) processed from GRF system was cut off at 1,000 Hz...
December 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29296674/dynamic-strategic-bond-analysis-yields-a-ten-step-synthesis-of-20-nor-salvinorin-a-a-potent-%C3%AE%C2%BA-or-agonist
#17
Jeremy J Roach, Yusuke Sasano, Cullen L Schmid, Saheem Zaidi, Vsevolod Katritch, Raymond C Stevens, Laura M Bohn, Ryan A Shenvi
Salvinorin A (SalA) is a plant metabolite that agonizes the human kappa -opioid receptor (κ-OR) with high affinity and high selectivity over mu- and delta- opioid receptors. Its therapeutic potential has stimulated extensive semisynthetic studies and total synthesis campaigns. However, structural modification of SalA has been complicated by its instability, and efficient total synthesis has been frustrated by its dense, complex architecture. Treatment of strategic bonds in SalA as dynamic and dependent on structural perturbation enabled the identification of an efficient retrosynthetic pathway...
December 27, 2017: ACS Central Science
https://www.readbyqxmd.com/read/29238816/design-and-evaluation-of-an-instrumented-wobble-board-for-assessing-and-training-dynamic-seated-balance
#18
Andrew D Williams, Quinn A Boser, Animesh Singh Kumawat, Kshitij Agarwal, Hossein Rouhani, Albert H Vette
Methods that effectively assess and train dynamic seated balance are critical for enhancing functional independence and reducing risk of secondary health complications in the elderly and individuals with neuromuscular impairments. The objective of this research was to devise and validate a portable tool for assessing and training dynamic seated balance. An instrumented wobble board was designed and constructed that (1) elicits multidirectional perturbations in seated individuals, (2) quantifies seated balance proficiency, and (3) provides real-time, kinematics-based vibrotactile feedback...
April 1, 2018: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29235013/effects-of-weight-loss-on-acoustic-parameters-after-bariatric-surgery
#19
Lourdes Bernadete Rocha de Souza, Marquiony Marques Dos Santos, Leandro Araújo Pernambuco, Cynthia Meira de Almeida Godoy, Deysianne Meire da Silva Lima
BACKGROUND: Patients with morbid obesity may present vocal alterations, since large accumulation of fat in the vocal tract may interfere with voice production of these individuals. OBJECTIVE: Verify the neck circumference and the acoustic parameters of voice in obese women, before and after the bariatric surgery, and compare the results with a control group, with normal weight. METHODS: Observational, longitudinal, descriptive study with patients referred to the SCODE (Obesity Surgery and Related Disorders Center) in a university hospital...
December 12, 2017: Obesity Surgery
https://www.readbyqxmd.com/read/29232765/influence-of-mouth-and-jaw-movements-on-dynamics-of-spontaneous-eye-blink-activity-assessed-during-slitlamp-biomicroscopy
#20
Michael J Doughty
BACKGROUND: To evaluate oculo-mandibular interactions during evaluation of spontaneous eye blink rate (SEBR) of normal young adult human subjects while seated at a slitlamp. METHODS: Repeat video recordings of five minutes duration were made on 76 young adult emmetropic subjects aged 18-25 years. The subjects were instructed to direct their gaze horizontally toward a distant target with the entire cornea of the left eye illuminated with a broad beam cobalt blue light...
December 12, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
keyword
keyword
108016
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"