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https://www.readbyqxmd.com/read/29900009/seated-pressures-in-daily-wheelchair-and-sports-equipment-investigating-the-protective-effects-of-cushioned-shorts
#1
Torey M Anderson, Kaitlynn L McKirgan, Jennifer D Hastings
Study design: The primary study design was a pretest and posttest study performed in a single session with subjects as their own control. We summarize three integrated and sequential studies. Objective: The objective of this study was to investigate whether commercially available cushioned shorts would add skin protection when used in adaptive sports equipment (AE). Setting: Community in Tacoma Washington, USA. Methods: TekScan Pressure Mapping System for recording average (AP) and peak (PP) seating pressures...
2018: Spinal Cord Series and Cases
https://www.readbyqxmd.com/read/29895449/kinematics-based-prediction-of-trunk-muscle-activity-in-response-to-multi-directional-perturbations-during-sitting
#2
Jacques Bobet, Kei Masani, Milos R Popovic, Albert H Vette
Recent work suggests that functional electrical stimulation can be used to enhance dynamic trunk stability following spinal cord injury. In this context, knowledge of the relation between trunk kinematics and muscle activation in non-disabled individuals may assist in developing kinematics-based neuroprostheses. Our objective was therefore to predict the activation profiles of the major trunk muscles from trunk kinematics following multi-directional perturbations during sitting. Trunk motion and electromyograms (EMG) from ten major trunk muscles were acquired in twelve non-disabled, seated individuals who experienced a force of approximately 200 N applied to the trunk in eight horizontal directions...
June 9, 2018: Medical Engineering & Physics
https://www.readbyqxmd.com/read/29885721/determination-of-a-sagittal-plane-axis-of-rotation-for-a-dynamic-office-chair
#3
C M Bauer, F M Rast, C Böck, R P Kuster, D Baumgartner
OBJECTIVE: This study investigated the location of the axis of rotation in sagittal plane movement of the spine in a free sitting condition to adjust the kinematics of a mobile seat for a dynamic chair. BACKGROUND: Dynamic office chairs are designed to avoid continuous isometric muscle activity, and to facilitate increased mobility of the back during sitting. However, these chairs incorporate increased upper body movement which could distract office workers from the performance of their tasks...
October 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29784473/tailbone-pain-from-coccyx-injuries-on-water-slides-a-case-series
#4
Patrick M Foye, Dena M Abdelshahed, Evish Kamrava, Renee Enriquez, Gerard J D'Onofrio
BACKGROUND: Water slides and rides are increasingly popular attractions at amusement parks. There has been some documentation of various patterns of injury associated with these rides, most notably vaginal injuries caused by water jets. But we find no previous medical publications reporting the association between water slides/rides with coccydynia (coccyx pain) and tailbone injuries. CASE REPORT: Our purpose in this case report was to assess for an association between water slides/rides with injuries to the coccyx causing coccyx pain...
May 18, 2018: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29764614/use-and-physiological-responses-of-portable-dynamic-office-workstations-in-an-occupational-setting-a-field-study
#5
Vera Schellewald, Jens Kleinert, Rolf Ellegast
OBJECTIVE: The aim of this study was to investigate the use of two types of dynamic workstations (Deskbike, activeLife Trainer) and their effects on physiological activation in an occupational setting. METHODS: 30 employees were given access to the devices for 28 days. Frequency and duration of borrowing and use was recorded by a Chipcard-system. Physiological activation (energy expenditure, heart rate) while working in a seated position and using the workstations was measured with the activity tracker Fitbit Charge HR...
September 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29748721/impact-of-acute-dynamic-exercise-on-radial-artery-low-flow-mediated-constriction-in-humans
#6
Robert O Elliott, Sultan Alsalahi, James P Fisher
PURPOSE: A "low-flow mediated constriction" (L-FMC) is evoked in the radial artery by the inflation of an ipsilateral wrist cuff to a supra-systolic pressure. We sought to test the hypothesis that the radial artery L-FMC response is augmented immediately following acute dynamic leg exercise in young healthy individuals. METHODS: Ten healthy and recreationally active men (23 ± 4 years) undertook a 30-min trial of incremental dynamic leg cycling exercise (10 min at 50, 100 and 150 W) and a 30-min time control trial (seated rest)...
May 10, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29673204/older-adults-with-weaker-muscle-strength-stand-up-from-a-sitting-position-with-more-dynamic-trunk-use
#7
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
#8
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
#9
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/patients-with-sacroiliac-joint-dysfunction-exhibit-altered-movement-strategies-when-performing-a-sit-to-stand-task
#10
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: The objective of this study was to compare lower extremity biomechanics and the onset of muscle activity when rising from a chair in subjects with SIJD and in healthy persons...
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
#11
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...
May 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
#12
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
#13
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
#14
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
#15
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
#16
COMPARATIVE STUDY
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
#17
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
#18
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...
April 3, 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
#19
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
#20
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
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