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plate force

Arash Panahifar, L Dean Chapman, Lynn Weber, Nazanin Samadi, David M L Cooper
Bone acts as a reservoir for many trace elements. Understanding the extent and pattern of elemental accumulation in the skeleton is important from diagnostic, therapeutic, and toxicological perspectives. Some elements are simply adsorbed to bone surfaces by electric force and are buried under bone mineral, while others can replace calcium atoms in the hydroxyapatite structure. In this article, we investigated the extent and pattern of skeletal uptake of barium and strontium in two different age groups, growing, and skeletally mature, in healthy rats...
June 19, 2018: Journal of Bone and Mineral Metabolism
Edward Lum, Paul J Murphy
PURPOSE: The Cochet-Bonnet (COBO) aesthesiometer is the current standard in corneal sensitivity assessment. This study investigates the influence of ambient room humidity levels on the stimulus force exerted by the instrument. METHODS: A COBO instrument (Luneau Opthalmologie) with 0.12 mm nominal nylon filament diameter was placed in an environment chamber (Electro-tech systems Inc. PA, USA) at 25 °C and relative humidity (%RH) set to either 20-80%, in 10% steps...
June 19, 2018: Eye
Erfan Shahabpoor, Aleksandar Pavic
Continuous monitoring of natural human gait in real-life environments is essential in many applications including disease monitoring, rehabilitation, and professional sports. Wearable inertial measurement units are successfully used to measure body kinematics in real-life environments and to estimate total walking ground reaction forces GRF(t) using equations of motion. However, for inverse dynamics and clinical gait analysis, the GRF(t) of each foot is required separately. Using an experimental dataset of 1243 tri-axial separate-foot GRF(t) time histories measured by the authors across eight years, this study proposes the 'Twin Polynomial Method' (TPM) to estimate the tri-axial left and right foot GRF(t) signals from the total GRF(t) signals...
June 19, 2018: Sensors
Christian May, Mike Egloff, Andre Butscher, Marius Johann Baptist Keel, This Aebi, Klaus Arno Siebenrock, Johannes Dominik Bastian
BACKGROUND: In elderly patients who have sustained an acetabular fracture involving disruption of the quadrilateral plate (QLP), postoperative loading of the joint beyond the level of partial weight-bearing can result in medial redisplacement of the QLP. The purpose of this biomechanical study was to compare the performances of 4 different fixation constructs intended to prevent medial redisplacement of the QLP. METHODS: Anterior column posterior hemitransverse (ACPHT) fractures with disruption of the QLP were created on synthetic hemipelves (fourth-generation Sawbones models) and subsequently stabilized with (1) a 12-hole plate bridging the QLP (Group 1), (2) the plate with added periarticular screws along the QLP (Group 2), (3) the plate combined with an infrapectineal buttress plate (Group 3), or (4) the plate with the added periarticular screws as well as the buttress plate (Group 4)...
June 20, 2018: Journal of Bone and Joint Surgery. American Volume
Giovanni D'Addio, Luigi Iuppariello, Paolo Bifulco, Bernardo Lanzillo, Nicola Pappone, Mario Cesarelli
OBJECTIVES: Smart fabrics and interactive textiles are a relatively new area of research, with many potential applications in the field of biomedical engineering. The ability of smart textiles to interact with the body provides a novel means to sense the wearer's physiology and respond to the needs of the wearer. Physiological signals, such as heart rate, breathing rates, and activity levels, are useful indicators of health status. These signals can be measured by means of textile-based sensors integrated into smart clothing which has the ability to keep a digital record of the patient's physiological responses since his or her last clinical visit, allowing doctors to make a more accurate diagnosis...
December 2017: Giornale Italiano di Medicina del Lavoro Ed Ergonomia
Pei-Hsun Wu, Dikla Raz-Ben Aroush, Atef Asnacios, Wei-Chiang Chen, Maxim E Dokukin, Bryant L Doss, Pauline Durand-Smet, Andrew Ekpenyong, Jochen Guck, Nataliia V Guz, Paul A Janmey, Jerry S H Lee, Nicole M Moore, Albrecht Ott, Yeh-Chuin Poh, Robert Ros, Mathias Sander, Igor Sokolov, Jack R Staunton, Ning Wang, Graeme Whyte, Denis Wirtz
The mechanical properties of cells influence their cellular and subcellular functions, including cell adhesion, migration, polarization, and differentiation, as well as organelle organization and trafficking inside the cytoplasm. Yet reported values of cell stiffness and viscosity vary substantially, which suggests differences in how the results of different methods are obtained or analyzed by different groups. To address this issue and illustrate the complementarity of certain approaches, here we present, analyze, and critically compare measurements obtained by means of some of the most widely used methods for cell mechanics: atomic force microscopy, magnetic twisting cytometry, particle-tracking microrheology, parallel-plate rheometry, cell monolayer rheology, and optical stretching...
June 18, 2018: Nature Methods
W Guy Hornsby, Jeremy A Gentles, Christopher J MacDonald, Satoshi Mizuguchi, Michael W Ramsey, Michael H Stone
The purpose of this monitoring study was to investigate how alterations in training affect changes in force-related characteristics and weightlifting performance. SUBJECTS: Seven competitive weightlifters participated in the study. METHODS: The weightlifters performed a block style periodized plan across 20 weeks. Force plate data from the isometric mid-thigh pull and static jumps with 0 kg, 11 kg, and 20 kg were collected near the end of each training block (weeks 1, 6, 10, 13, 17, and 20)...
October 13, 2017: Sports
Joanna Parsonage, Josh Secomb, Rebecca Dowse, Brendon Ferrier, Jeremy Sheppard, Sophia Nimphius
The primary purpose of this study was to investigate gender differences in the dynamic strength index (DSI): an assessment of upper-body dynamic strength relative to maximal isometric strength. The secondary purpose was to investigate gender differences in the dynamic skill deficit (DSD): an assessment of sports-specific dynamic strength relative to maximal isometric strength, and its association with a sports-specific performance measure in surfers. Nine male (age = 30.3 ± 7.3 yrs) and eight female (age = 25...
June 5, 2018: Sports
S Kyle Travis, Jacob R Goodin, George K Beckham, Caleb D Bazyler
Monitoring tests are commonly used to assess weightlifter’s preparedness for competition. Although various monitoring tests have been used, it is not clear which test is the strongest indicator of weightlifting performance. Therefore, the purpose of this study was to (1) determine the relationships between vertical jump, isometric mid-thigh pull (IMTP) and weightlifting performance; and (2) compare vertical jumps to IMTP as monitoring tests of weightlifting performance in a large cohort of male and female weightlifters...
May 23, 2018: Sports
Rodney A Kennedy, David Drake
A countermovement jump (CMJ) represents one of the most frequently used performance tests for monitoring neuromuscular function in athletes. An often-overlooked feature that may provide some useful diagnostic information is the actual shape of the force-time curve. The aim of this study was therefore to consider how the shape of the force-time curve influences jump performance. Thirty-three male rugby union players performed two CMJs on a force plate, with discrete variables and continuous curve analysis used...
April 18, 2018: Sports
Yun-Chung Lin, Chi-Chien Niu, Mohammad Nikkhoo, Meng-Ling Lu, Wen-Chien Chen, Chen-Ju Fu, Chih-Hsiu Cheng
BACKGROUND: Degenerative lumbar diseases (DLDs) are characterized by motor functional deficits and postural instability. In this study, we investigated the differences in the trunk muscle responses to postural control between the presurgical DLD patients and healthy individuals while performing the static and perturbed balance tasks. METHODS: Thirty-five DLD patients (aged 61.1 ± 8.0 years) and thirty-five asymptomatic controls (aged 62.9 ± 3.7 years) participated in this study...
June 11, 2018: Gait & Posture
Eva Kormanikova, Kamila Kotrasova
This article provides the useful data information on multiscale modeling of liquid storage laminated composite cylindrical tank under seismic load. The investigation process is divided into three levels. Within the numerical homogenization, the hexagonal microstructure one-eighth and full RVE model is assumed on micro-scale level. Homogenization of unidirectional lamina is done in four steps. For effective material properties of the whole laminate, the laminated representative volume element is assumed on meso-scale level...
June 2018: Data in Brief
D S Peterson, K R Lohse, M Mancini
BACKGROUND: Protective stepping after a loss of balance is related to falls. Anticipatory postural responses (APAs) prior to protective stepping can impact step performance, may be larger in people with PD, and have been suggested to be related to freezing of gait (FOG). However, whether people with PD and FOG (PD + FOG) exhibit larger APAs than people with PD and no FOG (PD-FOG) is unknown. RESEARCH QUESTION: Determine the impact of freezing status on APAs prior to protective steps, thus providing a better understanding of the link between FOG and APAs...
June 5, 2018: Gait & Posture
Yijue Diao, Rosa M Espinosa-Marzal
The friction between two adjacent tectonic plates under shear loading may dictate seismic activities. To advance the understanding of mechanisms underlying fault strength, we investigate the frictional characteristics of calcite in an aqueous environment. By conducting single-asperity friction experiments using an atomic force microscope, here we show three pathways of energy dissipation with increasing contact stresses: viscous shear of a lubricious solution film at low normal stresses; shear-promoted thermally activated slip, similar to dry friction but influenced by the hydrated ions localized at the interface; and pressure-solution facilitated slip at sufficiently high stresses and slow sliding velocities, which leads to a prominent decrease in friction...
June 13, 2018: Nature Communications
Daniel J Goble, Harsimran S Baweja
AIM: Postural sway measured using force plate technology is a known risk factor for falls in older adults, but is currently underutilized due to the high cost and lack of portability issues associated with most force plate systems. The Balance Tracking System (BTrackS) is a new force plate that alleviates these barriers and has potential for widespread use. The present study provides important normative data for the BTrackS Balance Test of postural sway that improves its translational value to the field of gerontology...
June 13, 2018: Geriatrics & Gerontology International
Mustafa Mohamed Osman Elhadi, Christina Zong-Hao Ma, Wing Kai Lam, Winson Chiu-Chun Lee
BACKGROUND: Long-distance walking is a convenient way for prompting physical activity of elderly people. However, walking ability declines with aging. RESEARCH QUESTION: This study assessed if silicone insoles with heel lifts (named here the prescribed insoles) could facilitate long-distance walking of older adults. METHODS: Fifteen adults aged over 65, who did not have obvious lower-limb problems, walked on a treadmill for totally 60 min in two separate walking sessions: 1) with the prescribed insoles, and 2) with original insoles of the standardized shoes...
June 4, 2018: Gait & Posture
Renan de Barros E Lima Bueno, Ana Paula Dias, Katia J Ponce, Rima Wazen, John B Brunski, Antonio Nanci
When bone implants are loaded, they are inevitably subjected to displacement relative to bone. Such micromotion generates stress/strain states at the interface that can cause beneficial or detrimental sequels. The objective of this study is to better understand the mechanobiology of bone healing at the tissue-implant interface during repeated loading. Machined screw shaped Ti implants were placed in rat tibiae in a hole slightly bigger than the implant diameter. Implants were held stable by a specially-designed bone plate that permits controlled loading...
May 31, 2018: Journal of the Mechanical Behavior of Biomedical Materials
William C Walker, Kayla J Nowak, Kimbra Kenney, Laura Manning Franke, Blessen C Eapen, Karen Skop, Harvey Levin, Amma A Agyemang, David F Tate, Elisabeth A Wilde, Sidney Hinds, Tracy L Nolen
OBJECTIVES: Determine if mild traumatic brain injury (mTBI) history is associated with balance disturbances. SETTING: Chronic Effects of Neurotrauma Consortium (CENC) centres. PARTICIPANTS: The CENC multi-centre study enrols post-9/11 era Service Members and Veterans with combat exposure. This sample (n = 322) consisted of enrolees completing initial evaluation by September 2016 at the three sites conducting computerized dynamic post-urography (CDP) testing...
June 12, 2018: Brain Injury: [BI]
Hiroyuki Seki, Takeo Nagura, Yasunori Suda, Naomichi Ogihara, Kohta Ito, Yasuo Niki, Morio Matsumoto, Masaya Nakamura
Axial loading of the human cadaver lower leg is known to generate eversion of the calcaneus and internal rotation of the tibia if the plantar surface of the foot does not slide on the floor. Such kinematic coupling between calcaneal eversion and internal tibial rotation has been described previously, but no studies have actually quantified the innate ability of the human foot to generate ground reaction moment around the vertical axis of the floor (vertical free moment) due to axial loading of the human cadaver lower leg...
June 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
Jennifer M Neugebauer, Michael LaFiandra
INTRODUCTION: Ground reaction forces (GRFs) during load carriage differ from unloaded walking. Methods to quantify peak vertical GRF (pGRFvert) of Soldiers walking with loads outside of a laboratory are needed in order to study GRFs during operationally relevant tasks. PURPOSE: Develop a statistically based model to predict pGRFvert during loaded walking from ActiGraph GT3X+ activity monitor (AM) vertical acceleration. METHODS: 15 male Soldiers (25...
June 8, 2018: Medicine and Science in Sports and Exercise
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