- Deformation of the human brain induced by mild angular head acceleration
Arash A Sabet
Department of Mechanical, Aerospace and Structural Engineering, Washington University, St Louis, MO 63130, USA
J Biomech 41:307-15. 2008
..of the human brain was measured in tagged magnetic resonance images (MRI) obtained dynamically during angular acceleration of the head...
- Defining accelerometer thresholds for activity intensities in adolescent girls
Margarita S Treuth
Center for Human Nutrition, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA
Med Sci Sports Exerc 36:1259-66. 2004
- Conducting accelerometer-based activity assessments in field-based research
Stewart G Trost
Community Health Institute, Kansas State University, Manhattan, KS 66506, USA
Med Sci Sports Exerc 37:S531-43. 2005
..The purpose of this review is to address important methodological issues related to conducting accelerometer-based assessments of physical activity in free-living individuals...
- Ambulatory estimation of foot placement during walking using inertial sensors
H Martin Schepers
Institute for Biomedical Technology and Technical Medicine MIRA, University of Twente, AE Enschede, The Netherlands
J Biomech 43:3138-43. 2010
..It is concluded that the ambulatory measurement system was able to reliably estimate foot placement during walking...
- Pedestrian Tracking with shoe-mounted inertial sensors
IEEE Comput Graph Appl 25:38-46. 2005
- Assessment of spatio-temporal gait parameters from trunk accelerations during human walking
Institute of Human Movement Sciences, University of Groningen, PO Box 196, 9700 AD Groningen, The Netherlands
Gait Posture 18:1-10. 2003
..To this purpose, acceleration patterns of the trunk and their relationships with spatio-temporal gait parameters were analysed in healthy ..
- Estimation of gait cycle characteristics by trunk accelerometry
The Balance and Gait Unit, Section of Physiotherapy Science, Institute of Public Health and Primary Health Care, University of Bergen, Ulriksdal 8c, N 5009 Bergen, Norway
J Biomech 37:121-6. 2004
- A review of accelerometry-based wearable motion detectors for physical activity monitoring
Che Chang Yang
Department of Mechanical Engineering, Yuan Ze University 135, Yuan Tung Rd, Chung Li, 32003, Taiwan
Sensors (Basel) 10:7772-88. 2010
..Finally this paper reviews and compares existing commercial products to provide a comprehensive outlook of current development status and possible emerging technologies...
- Analysis of stroke patient walking dynamics using a tri-axial accelerometer
School of Rehabilitation Sciences, Seirei Christopher University, 3453 Mikatabara cho, Kita ku, Hamamatsu, Shizuoka 433 8558, Japan
Gait Posture 30:60-4. 2009
The purpose of this study was to describe the characteristics of stroke patient gait using the acceleration signals which were obtained during walking...
- Gait posture estimation using wearable acceleration and gyro sensors
Division of Human Mechanical Systems and Design, Graduate School of Engineering, Hokkaido University, N13 W8, Kita ku, Sapporo 060 8628, Japan
J Biomech 42:2486-94. 2009
A method for gait analysis using wearable acceleration sensors and gyro sensors is proposed in this work. The volunteers wore sensor units that included a tri-axis acceleration sensor and three single axis gyro sensors...
- Wearable assistant for Parkinson's disease patients with the freezing of gait symptom
Wearable Computing Laboratory, Swiss Federal Institute of Technology Zurich, Zurich CH 8092, Switzerland
IEEE Trans Inf Technol Biomed 14:436-46. 2010
..This wearable system uses on-body acceleration sensors to measure the patients' movements...
- Reliability and validity of bilateral thigh and foot accelerometry measures of walking in healthy and hemiparetic subjects
Neurologic Rehabilitation and Research Program, Department of Neurology, Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA
Neurorehabil Neural Repair 20:297-305. 2006
..CONCLUSIONS: The accelerometry system provided reliable and valid spatiotemporal measures of gait for the upper range of speeds likely to be targeted for rehabilitation interventions in ambulatory subjects...
- Quaternion-based strap-down integration method for applications of inertial sensing to gait analysis
A M Sabatini
Scuola Superiore Sant Anna, Pisa, Italy
Med Biol Eng Comput 43:94-101. 2005
..8 degrees and RMSE(d) = 30.0 cm for an integration interval of two gait cycles (an improvement of 11 degrees and 262 cm)...
- Technical reliability assessment of three accelerometer models in a mechanical setup
Dale W Esliger
University of Saskatchewan, College of Kinesiology, Saskatoon, Canada
Med Sci Sports Exerc 38:2173-81. 2006
..Secondly, to determine the effects that acceleration and frequency have on these reliability measures.
- Reproducibility of a triaxial seismic accelerometer (DynaPort)
Vincent T van Hees
Faculty of Human Movement Sciences, VU University, Amsterdam, The Netherlands
Med Sci Sports Exerc 41:810-7. 2009
..To examine the reproducibility of a triaxial seismic accelerometer under controlled conditions and real-life conditions...
- Using objective physical activity measures with youth: how many days of monitoring are needed?
S G Trost
Department of Exercise, School of Public Health, University of South Carolina, Columbia 29208, USA
Med Sci Sports Exerc 32:426-31. 2000
..The purpose of this study was to establish the minimal number of days of monitoring required for accelerometers to assess usual physical activity in children...
- Quaternion-based extended Kalman filter for determining orientation by inertial and magnetic sensing
Angelo M Sabatini
ARTS Lab, Scuola Superiore Sant Anna, Piazza Martiri della Libertà, Pisa 56127, Italy
IEEE Trans Biomed Eng 53:1346-56. 2006
- Improving physical activity assessment in prepubertal children with high-frequency accelerometry monitoring: a methodological issue
Laboratory of Human Movement Studies EA 3608, Faculty of Sport Sciences and Physical Education, University of Lille 2, 9 rue de l Université 59790, Ronchin, France
Prev Med 44:143-7. 2007
..The aim of this study was to examine the duration of physical activity (PA) bouts in prepubertal children with high-frequency accelerometry monitoring...
- A comparison of questionnaire, accelerometer, and pedometer: measures in older people
Tess J Harris
Division of Community Health Sciences, St George s, University of London, London, UK
Med Sci Sports Exerc 41:1392-402. 2009
- Clinimetric review of motion sensors in children and adolescents
Sanne I de Vries
TNO Quality of Life, Department of Physical Activity and Health, P O Box 2215, 2301 CE, Leiden, The Netherlands
J Clin Epidemiol 59:670-80. 2006
..To review the clinimetric quality of motion sensors used to assess physical activity in healthy children and adolescents (2-18 years)...
- How active are people with stroke?: use of accelerometers to assess physical activity
PT OT, Department of Physical Therapy, University of British Columbia, T325 2211 Westbrook Mall, Vancouver, BC, V6T 2B5, Canada
Stroke 40:163-8. 2009
..The secondary aims were to measure the amount of physical activity with accelerometers that people with stroke undertake in the community and its relationship with walking capacity (6-minute walk test distance)...
- Hierarchy of individual calibration levels for heart rate and accelerometry to measure physical activity
MRC Epidemiology Unit, Cambridge CB1 9NL, UK
J Appl Physiol 103:682-92. 2007
..69 (0.10) m, 70 (14) kg]. Acceleration (along the longitudinal axis of the trunk) and HR were measured simultaneously...
- Physical activity levels and patterns of 9- and 15-yr-old European children
Chris J Riddoch
Department of Exercise and Health Sciences, University of Bristol, Bristol, UK
Med Sci Sports Exerc 36:86-92. 2004
..Very limited physical activity data exist that have been collected from representative samples of children and even fewer data collected where physical activity has been measured using objective methods...
- Imputation of missing data when measuring physical activity by accelerometry
Diane J Catellier
Department of Biostatistics, University of North Carolina, Chapel Hill, NC 27514 4145, USA
Med Sci Sports Exerc 37:S555-62. 2005
..The fact that counts are not being recorded during periods in which the monitor is not worn means that many common estimators of daily physical activity are biased downward...
- Calibration of an accelerometer during free-living activities in children
Department of Social Medicine, University of Bristol, Bristol, UK
Int J Pediatr Obes 2:218-26. 2007
..The aims of this study were to develop an equation to predict energy expenditure and to derive cut-points for moderate and vigorous physical activity intensity from the Actigraph accelerometer output in children aged 12 years...
- Three dimensional inertial sensing of foot movements for automatic tuning of a two-channel implantable drop-foot stimulator
P H Veltink
Institute for Biomedical Technology BMTI, University Twente, P O Box 217, 7500 AE Enschede, The Netherlands
Med Eng Phys 25:21-8. 2003
..position during the swing phase of gait can be reconstructed on the basis of three-dimensional measurement of acceleration and angular velocity, using initial and final conditions during mid-stance...
- Moving towards acceleration for estimates of activity-specific metabolic rate in free-living animals: the case of the cormorant
Rory P Wilson
Institute of Environmental Sustainability, School of the Environment and Society, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, Wales, UK
J Anim Ecol 75:1081-90. 2006
..2. The deployment of data loggers that measure acceleration is emerging as a powerful tool for quantifying the behaviour of free-living animals...
- Maturation of otolith-related brainstem neurons in the detection of vertical linear acceleration in rats
Department of Physiology, Faculty of Medicine, The University of Hong Kong, Sassoon Road, Hong Kong
Eur J Neurosci 23:2431-46. 2006
..Conscious rats were subjected to sinusoidal linear acceleration along the vertical plane...
- Validity and reliability of intra-stroke kayak velocity and acceleration using a GPS-based accelerometer
Biomechanics and Performance Analysis, Australian Institute of Sport, Bruce, Australia
Sports Biomech 9:47-56. 2010
The aim of this study was to assess the validity and reliability of the velocity and acceleration measured by a kayak-mounted GPS-based accelerometer units compared to the video-derived measurements and the effect of satellite ..
- Is it feasible to reconstruct body segment 3-D position and orientation using accelerometric data?
Laboratorio di Ingegneria Biomedica, Istituto Superiore di Sanita, 00161 Rome, Italy
IEEE Trans Biomed Eng 50:476-83. 2003
..5 x 10(-2) ms(-2): offset error), the results indicate that none of the two ACs systems analyzed is suitable for body segment P&O estimation in routine biomechanical applications...
- Implementation of a real-time human movement classifier using a triaxial accelerometer for ambulatory monitoring
Dean M Karantonis
Graduate School of Biomedical Engineering, University of New South Wales, Sydney, Australia
IEEE Trans Inf Technol Biomed 10:156-67. 2006
..3% accuracy), and detection of possible falls was made with 95.6% accuracy. Results demonstrate the feasibility of implementing an accelerometry-based, real-time movement classifier using embedded intelligence...
- Accelerometer prediction of energy expenditure: vector magnitude versus vertical axis
Cheryl A Howe
Department of Kinesiology, University of Massachusetts, Amherst, MA 01003, USA
Med Sci Sports Exerc 41:2199-206. 2009
..It is suggested that triaxial accelerometers (RT3) are superior to single-plane accelerometers for predicting energy expenditure (EE)...
- Direct measurement of human movement by accelerometry
Biomedical Electronics Laboratory, Electronic and Computer Engineering Department, University of Limerick, Limerick, Ireland
Med Eng Phys 30:1364-86. 2008
..Finally the concept of direct measurement by accelerometry is presented with past studies and modern techniques used for data analysis...
- Validation and calibration of an accelerometer in preschool children
Russell R Pate
Arnold School of Public Health, University of South Carolina, 730 Devine Street, Columbia, SC 29208, USA
Obesity (Silver Spring) 14:2000-6. 2006
..Studies of physical activity in young children are limited by the lack of valid and acceptable measures. The purpose of this study was to calibrate and validate the ActiGraph accelerometer for use with 3- to 5-year-old children...
- Determinants of a simulated cross-country skiing sprint competition using V2 skating technique on roller skis
KIHU Research Institute for Olympic Sports, Jyvaskyla, Finland
J Strength Cond Res 24:920-8. 2010
..This study indicates that sprint skiers should emphasize sport-specific upper body training, and training skiing economy at high speeds...
- The use of accelerometry in adolescents and its implementation with non-wear time activity diaries in free-living conditions
Department of Public Health, University of Ghent, Ghent, Belgium
J Sports Sci 29:103-13. 2011
..It is therefore recommended to use a non-wear activity diary for gaining insight into the physical activity levels of individuals...
- Principles of design and analyses for the calibration of accelerometry-based activity monitors
Gregory J Welk
Department of Health and Human Performance, Iowa State University, Ames, IA 50011 1160, USA
Med Sci Sports Exerc 37:S501-11. 2005
..Direct comparisons are made between a mixed model regression approach and an approach based on receiver operator characteristic curves...
- Precision of measurements of physical workload during standardised manual handling. Part II: Inclinometry of head, upper back, neck and upper arms
G A Hansson
Department of Occupational and Environmental Medicine, University Hospital, SE 221 85 Lund, Sweden
J Electromyogr Kinesiol 16:125-36. 2006
..The contribution of the measurement procedure per se to the between-days variability, i.e., the imprecision of the method, was small: less than 2 degrees for angles and 3% for angular velocity...
- New rat model for diffuse brain injury using coronal plane angular acceleration
Ronald J Fijalkowski
Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, WI 53226, USA
J Neurotrauma 24:1387-98. 2007
..model was developed to induce diffuse brain injury (DBI) in rats through pure coronal plane angular acceleration. An impactor was propelled down a guide tube toward the lateral extension of the helmet fixture...
- Anticipatory postural adjustments associated with a forward leg raising in children: effects of age, segmental acceleration and sensory context
Laboratoire TIMC IMAG, Equipe Sante, Plasticite, Motricite, UMR 5525, Universite Joseph Fourier CNRS, Grenoble, 38 706 La Tronche Cedex, France
Clin Neurophysiol 119:2546-54. 2008
The purpose of this study was to determine the influence of age, segmental acceleration and sensory context on anticipatory postural adjustments (APAs) in a forward leg raising task.
- Humans use internal models to estimate gravity and linear acceleration
D M Merfeld
Neurological Sciences Institute, Oregon Health Sciences University, Portland 97209, USA
Nature 398:615-8. 1999
..For example, many tasks require neural processing to distinguish linear acceleration from gravity, but Einstein's equivalence principle states that all linear accelerometers must measure both ..
- Adaptation and generalization in acceleration-dependent force fields
Eun Jung Hwang
Laboratory for Computational Motor Control, Department of Biomedical Engineering, Johns Hopkins School of Medicine, 416 Traylor Building, 720 Rutland Ave, Baltimore, MD 21205, USA
Exp Brain Res 169:496-506. 2006
..g., a tennis racquet, imposes a field of forces on the arm that depends on limb position, velocity, and acceleration. A fundamental characteristic of this field is that the forces due to acceleration and velocity are linearly ..
- Steps towards a miniaturized, robust and autonomous measurement device for the long-term monitoring of patient activity: ActiBelt
Sylvia Lawry Center for Multiple Sclerosis Research, Munich, Germany
Biomed Tech (Berl) 52:149-55. 2007
..the first steps in the development of a wearable measurement device for measuring a subject's three-dimensional acceleration. The ultimate aim is a standard measurement instrument integrated in a belt buckle that allows objective ..
- Acceleration carries the local inversion effect in biological motion perception
Dorita H F Chang
Centre for Neuroscience Studies, Queen s University, Kingston, Ontario, Canada
J Vis 9:19.1-17. 2009
..We show that the inversion effect is correlated with the difference in vertical acceleration between the constituent fragments of each stimulus...
- Is structured observation a valid technique to measure handwashing behavior? Use of acceleration sensors embedded in soap to assess reactivity to structured observation
Pavani K Ram
University at Buffalo, Buffalo, New York 14221, USA
Am J Trop Med Hyg 83:1070-6. 2010
..We assessed reactivity to structured observation in rural Bangladesh by distributing soap containing acceleration sensors and performing structured observation 4 days later. Sensors recorded the number of times soap was moved...
- Gait event detection using linear accelerometers or angular velocity transducers in able-bodied and spinal-cord injured individuals
Jan M Jasiewicz
School of Human Movement Studies, Centre for Health Research, Queensland University of Technology, Kelvin Grove, Queensland 4059, Australia
Gait Posture 24:502-9. 2006
..02). We conclude that detection based on foot linear accelerations or foot angular velocity can correctly identify the timing of IC and EC events in both normal and spinal-cord injured subjects...
- Validity of physical activity intensity predictions by ActiGraph, Actical, and RT3 accelerometers
Megan P Rothney
Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee, USA
Obesity (Silver Spring) 16:1946-52. 2008
..This study seeks to determine the capabilities of eight previously published regression equations for three commercially available accelerometers to predict summary measures of daily EE...
- Algorithms to determine event timing during normal walking using kinematic data
Department of Kinesiology and Health Science, California State University, Sacramento, 6000 J Street, Sacramento, CA 95819 6073, USA
J Biomech 33:783-6. 2000
- Centre of mass movement and mechanical energy fluctuation during gallop locomotion in the Thoroughbred racehorse
Structure and Motion Laboratory, The Royal Veterinary College, University of London, Hawkshead Lane, North Mymms, Hatfield, AL9 7TA, UK
J Exp Biol 209:3742-57. 2006
..and dorsoventral) and rotational (roll, pitch and heading) kinematic parameters (displacement, velocity and acceleration) were calculated for seven horses at gallop speeds ranging from 7 to 17 m s(-1) during their regular training ..
- Gait assessment in Parkinson's disease: toward an ambulatory system for long-term monitoring
Laboratory of Movement Analysis and Measurement LMAM, Swiss Federal Institute of Technology EPFL, Lausanne, Switzerland
IEEE Trans Biomed Eng 51:1434-43. 2004
..We concluded that our method provides a simple yet effective way of ambulatory gait analysis in PD patients with results confirming those obtained from much more complex and expensive methods used in gait labs...
- Estimating energy expenditure using accelerometers
Scott E Crouter
Department of Exercise, Sport, and Leisure Studies, The University of Tennessee, Knoxville, TN, USA
Eur J Appl Physiol 98:601-12. 2006
..05). In conclusion, no single regression equation works well across a wide range of activities for the prediction of EE or time spent in light, moderate, and vigorous physical activity...
- Ambulatory monitoring of physical activities in patients with Parkinson's disease
Laboratory of Movement Analysis and Measurement LMAM, Ecole Polytechnique Federale de Lausanne EPFL, STI LMAM, ELG 239, Lausanne Vaud 1024, Switzerland
IEEE Trans Biomed Eng 54:2296-9. 2007
..We concluded that our method provides a simple, accurate, and effective means to objectively quantify physical activities in both normal and PD patients and may prove useful to assess the level of motor functions in the latter...
- Assessment of spatio-temporal parameters during unconstrained walking
Institute of Human Movement Sciences, University of Groningen, P O Box 196, 9700 AD Groningen, The Netherlands
Eur J Appl Physiol 92:39-44. 2004
..An analysis of trunk acceleration data produced temporal gait parameters (duration of subsequent stride cycles and left/right steps) and ..
- Redistribution of neurofilaments and accumulation of beta-amyloid protein after brain injury by rotational acceleration of the head
Institute of Anatomy and Cell Biology, University of Goteborg, Goteborg, Sweden
J Neurotrauma 20:169-78. 2003
Rotational acceleration of the head, as occurs in falls, car crashes, and sport injuries, may result in diffuse brain damage, with acute and chronic neurological and psychiatric symptoms...
- Development of a wearable motion detector for telemonitoring and real-time identification of physical activity
Che Chang Yang
Department of Mechanical Engineering, Yuan Ze University, Chung Li, Taiwan, ROC
Telemed J E Health 15:62-72. 2009
..An algorithm was developed to process real-time tri-axial acceleration signals produced by human movement to identify targeted still postures, postural transitions, and dynamic ..
- Detection of type, duration, and intensity of physical activity using an accelerometer
Alberto G Bonomi
Department of Human Biology, Maastricht University, Maastricht, The Netherlands
Med Sci Sports Exerc 41:1770-7. 2009
..The aim of this study was to develop models for the detection of type, duration, and intensity of human physical activity using one triaxial accelerometer...
- Measurements of acceleration during videofluorographic evaluation of dysphagic patients
N P Reddy
Biomedical Engineering, University of Akron, Akron, OH 44325 0302, USA
Med Eng Phys 22:405-12. 2000
..However, the underlying physiological events that give rise to the acceleration signal are poorly understood...
- Quality control and data reduction procedures for accelerometry-derived measures of physical activity
Children s Hospital of Eastern Ontario Research Institute, Ottawa, Ontario
Health Rep 21:63-9. 2010
- An artificial neural network to estimate physical activity energy expenditure and identify physical activity type from an accelerometer
Dept of Mathematics and Statistics, Univ of Massachusetts, Lederle Graduate Research Center, Amherst, MA 01003, USA
J Appl Physiol 107:1300-7. 2009
..This novel approach of applying ANNs for processing Actigraph accelerometer data is promising and shows that we can successfully estimate activity METs and identify activity type using ANN analytic procedures...
- Measuring free-living physical activity in adults with and without neurologic dysfunction with a triaxial accelerometer
Leigh A Hale
REAL Neurology Research Group, Centre for Physiotherapy Research and School of Physiotherapy, University of Otago, Dunedin, New Zealand
Arch Phys Med Rehabil 89:1765-71. 2008
..To investigate the reliability, validity, and utility of a triaxial accelerometer to measure physical activity in the free-living environment in adults with and without neurologic dysfunction...
- A feedback model explains the differential scaling of human postural responses to perturbation acceleration and velocity
Torrence D J Welch
The Wallace H Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332 0535, USA
J Neurophysiol 101:3294-309. 2009
..was experimentally modulated using 34 different anterior-posterior support-surface translations of varying peak acceleration and velocity but the same total displacement...
- Clinical review: Constitutional advancement of growth, a.k.a. early growth acceleration, predicts early puberty and childhood obesity
Third Department of Pediatrics, University of Athens School of Medicine, Attikon University Hospital, Athens, Greece
J Clin Endocrinol Metab 95:4535-41. 2010
Constitutional advancement of growth (CAG), a.k.a. early growth acceleration, refers to a growth pattern that is characterized by growth acceleration soon after birth, reaching a zenith centile in the first 2 to 4 yr of life and followed ..
- Linear and angular head acceleration measurements in collegiate football
Center for Injury Biomechanics, Department of Sports Medicine, Virginia Tech Wake Forest, Blacksburg, VA 24061, USA
J Biomech Eng 131:061016. 2009
..Human head acceleration data for a range of impact severities were collected by instrumenting the helmets of collegiate football ..
- Accelerometry based assessment of gait parameters in children
Movement Analysis Lab, Orthopaedic Department, University Hospital Muenster, Domagkstr 3, 48149 Muenster, Germany
Gait Posture 24:482-6. 2006
..During walking, accelerations were measured by three orthogonally mounted acceleration sensors in a small wireless device (DynaPort MiniMod) that was attached to the lower back...
- Daily impact score in long-term acceleration measurements of exercise
Department of Medical Technology, Institute of Biomedicine, University of Oulu, P O Box 5000, FIN 90014, Oulu, Finland
J Biomech 43:1960-4. 2010
..theories, the aim of this study was to develop and test a daily impact score (DIS) using long-term continuous acceleration measurements of exercise...
- Estimation of respiratory waveform and heart rate using an accelerometer
D H Phan
International Research Center MICA, Ha Noi University of Technology CNRS UMI 2954 INP Grenoble, France
Conf Proc IEEE Eng Med Biol Soc 2008:4916-9. 2008
..This method is therefore suitable for automatic identification some disease, for example arrhythmia or sleep apnea...
- Estrogen-related gender difference in survival rate and cortical blood flow after impact-acceleration head injury in rats
R L Roof
Neuroscience Therapeutics, Pfizer Global Research and Development, Ann Arbor Laboratories, Michigan 48105, USA
J Neurotrauma 17:1155-69. 2000
..In the following series of experiments, we used the Marmarou impact-acceleration head injury model (with a 500-g, 1...
- The quick and the fast: the evolution of acceleration capacity in Anolis lizards
Department of Ecology and Evolutionary Biology, Tulane University, New Orleans Louisiana 70118, USA
Evolution 60:2137-47. 2006
Although of prime ecological relevance, acceleration capacity is a poorly understood locomotor performance trait in terrestrial vertebrates...
- Dual mechanisms of allosteric acceleration of the Na(+),K(+)-ATPase by ATP
School of Chemistry, University of Sydney, Sydney, Australia
Biophys J 98:2290-8. 2010
..the observed kinetics are monophasic at all ATP concentrations, indicating a monoprotomeric enzyme; however, an acceleration of the E2 --> E1 transition by ATP still occurs, to a maximum rate constant of 182 (+/- 6) s(-1)...
- Vestibular evoked myogenic potentials evoked by brief interaural head acceleration: properties and possible origin
Sally M Rosengren
Prince of Wales Clinical School and Medical Research Institute, University of New South Wales, Sydney, New South Wales, Australia
J Appl Physiol 107:841-52. 2009
The vestibular system responds to head acceleration by producing compensatory reflexes in the eyes and postural muscles...
- Pitch then power: limitations to acceleration in quadrupeds
Sarah B Williams
Structure and Motion Laboratory, The Royal Veterinary College, University of London, Hatfield, Herts AL9 7TA, UK
Biol Lett 5:610-3. 2009
Rapid acceleration and deceleration are vital for survival in many predator and prey animals and are important attributes of animal and human athletes...
- Rotational acceleration closed head flexion trauma generates more extensive diffuse brain injury than extension trauma
Division of Vehicle Safety, Applied Mechanics, Chalmers University of Technology, Goteborg, Sweden
J Neurotrauma 28:57-70. 2011
..Anesthetized rabbits were exposed once to a sagittal rotational acceleration head and neck injury at either a high or a low load level, using either flexion or extension...
- Transient, powerful pressures are generated in the brain by a rotational acceleration impulse to the head
Vehicle Safety, Department of Applied Mechanics, Chalmers University of Technology, , Sweden
Eur J Neurosci 21:2876-82. 2005
A rotational acceleration impulse to a head, as occurs at traffic accidents, sport injuries, assaults and falls, induces a diffuse brain damage that eventually could result in persistent neuropsychiatric deficits and neurodegeneration...
- Proximal tibia volumetric bone mineral density is correlated to the magnitude of local acceleration in male long-distance runners
Institut de Recherche en Réadaptation et Clinique Romande de Réadaptation, SuvaCare, Sion, Switzerland
J Appl Physiol 108:852-7. 2010
..running distance, peak accelerations, time); and 2) interactions (for instance, if vBMD prediction by peak acceleration depends on running distance)...
- Technical aspects of an impact acceleration traumatic brain injury rat model with potential suitability for both microdialysis and PtiO2 monitoring
Department of Neurochemistry, I M N S S A, B P 610, 83800 Toulon armees, France
J Neurosci Methods 140:23-8. 2004
..Studies on efficiency and therapeutic window of neuroprotective pharmacological molecules are now conceivable to ameliorate severe head-injury treatment...
- Age-related differences in acceleration, maximum running speed, and repeated-sprint performance in young soccer players
Sport Science Department, ASPIRE Academy for Sports Excellence, Doha, Qatar
J Sports Sci 29:477-84. 2011
We investigated age-related differences in the relationships among acceleration, maximum running speed, and repeated-sprint performance in 61 highly trained young male soccer players (Under 14, n = 14; Under 16, n = 22; Under 18, n = 25)...
- Spatiotemporal processing of linear acceleration: primary afferent and central vestibular neuron responses
D E Angelaki
Department of Neurobiology, Washington University School of Medicine Central Institute for the Deaf, St Louis, Missouri 63110, USA
J Neurophysiol 84:2113-32. 2000
..2-D) neural tuning have been proposed as a major neural mechanism in the signal processing of linear acceleration. To examine this hypothesis, we studied the firing properties of primary otolith afferents and central otolith ..
- Biophysics of cardiopulmonary resuscitation with periodic z-axis acceleration or abdominal compression at aortic resonant frequencies
Charles F Babbs
Department of Basic Medical Sciences, Purdue University, 1426 Lynn Hall, West Lafayette, IN 47907 1246, USA
Resuscitation 69:455-69. 2006
Periodic z-axis acceleration (pGz)-CPR involves an oscillating motion of a whole patient in the head-to-foot dimension on a mechanized table...
- Classification of a known sequence of motions and postures from accelerometry data using adapted Gaussian mixture models
Felicity R Allen
Graduate School of Biomedical Engineering, University of New South Wales, Sydney, NSW, 2052, Australia
Physiol Meas 27:935-51. 2006
..While limited to a restricted subset of possible motions and postures, these results provide a significant step in the search for a more robust and accurate ambulatory classification system...
- Out on a limb: The differential effect of substrate diameter on acceleration capacity in Anolis lizards
Department of Ecology and Evolutionary Biology, 310 Dinwiddie Hall, Tulane University, New Orleans, LA 70118, USA
J Exp Biol 209:4515-23. 2006
We investigated how substrate diameter affects acceleration performance in three Anolis lizard species (A. sagrei, A. carolinensis and A...
- Effect of abdominal vibroacoustic stimulation on sound and acceleration levels at the head of the fetal sheep
R M Abrams
Department of Obstetrics and Gynecology, University of Florida, Gainesville, USA
Obstet Gynecol 90:216-20. 1997
..To measure the vibratory response of the fetal head and abdominal wall in sheep during vibroacoustic stimulation...
- Speed perception during acceleration and deceleration
Systems Neurobiology Laboratories, The Salk Institute for Biological Studies, La Jolla, CA, USA
J Vis 8:9.1-11. 2008
We have recently shown that stimulus acceleration affects subsequent preferred speed and tuning widths of macaque area MT neurons (A. Schlack, B. Krekelberg, & T. D. Albright, 2007)...
- Comparison of two methods to assess PAEE during six activities in children
1MRC Epidemiology Unit, Cambridge, United Kingdom
Med Sci Sports Exerc 39:2180-8. 2007
..Three PAEE-prediction models derived using the current data, and five previously published prediction models were cross-validated to estimate PAEE in this sample...
- The technology of accelerometry-based activity monitors: current and future
Kong Y Chen
Department of Medicine and Biomedical Engineering, Vanderbilt University, Nashville, TN 37232 2279, USA
Med Sci Sports Exerc 37:S490-500. 2005
..This paper reviews accelerometry-based activity monitors, including single-site first-generation devices, emerging technologies, and analytical approaches to predict energy expenditure, with suggestions for further research and development...
- Pedometer accuracy in nursing home and community-dwelling older adults
Elizabeth V Cyarto
Department of Health Studies and Gerontology, University of Waterloo, Waterloo, Ontario, Canada
Med Sci Sports Exerc 36:205-9. 2004
..Pedometers, however, can be confidently used with ostensibly healthy older adult populations for both assessment and motivation purposes...
- Automated estimation of initial and terminal contact timing using accelerometers; development and validation in transtibial amputees and controls
Ruud W Selles
Department of Rehabilitation Medicine, Erasmus Medical Center, 3000 CA Rotterdam, The Netherlands
IEEE Trans Neural Syst Rehabil Eng 13:81-8. 2005
..An automated multiphase algorithm was developed to estimate the time of IC and TC in the acceleration signals of five healthy subjects and two transtibial amputees walking at different walking speeds...
- Cerebellar disease alters the axis of the high-acceleration vestibuloocular reflex
Mark F Walker
Dept of Neurology, The Johns Hopkins University, 600 N Wolfe St, Pathology 2 210, Baltimore, MD 21287, USA
J Neurophysiol 94:3417-29. 2005
..Our findings support the hypothesis that upward eye velocity during yaw results from AC excitation, which must normally be suppressed by the intact cerebellum...
- Classification of locomotor activity by acceleration measurement: validation in Parkinson disease
D Barry Keenan
VivoMetrics, Inc. 121 N. Fir Street, Ventura, CA 93001, USA
Biomed Sci Instrum 41:329-34. 2005
..breathing information from respiratory inductive plethysmography (RIP) sensors embedded in a light garment, and acceleration signals from a dual axis accelerometer attached close to the center of body mass...
- A new rat model for diffuse axonal injury using a combination of linear acceleration and angular acceleration
Hong Cai Wang
Department of Neurosurgery, N3 People s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Baoshan District, Shanghai, China
J Neurotrauma 27:707-19. 2010
..In most clinical scenarios, DAI is caused by these two forms of acceleration in combination...
- Kinetics of stiff-legged gait: induced acceleration analysis
P O Riley
Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA 02114, USA
IEEE Trans Rehabil Eng 7:420-6. 1999
..IA's throughout the gait cycle were calculated and the sum of the IA's was compared to the knee joint angular acceleration estimated from kinematic data...
- Exertion dependent alternations in force fluctuation and limb acceleration during sustained fatiguing contraction
Department of Physical Therapy, College of Medicine, National Cheng Kung University, 701, Tainan, Taiwan
Eur J Appl Physiol 97:362-71. 2006
..conducted to contrast exertion-dependent changes in electromyography (EMG), force fluctuation (FF), and limb acceleration (LA) during isometric contraction to attain a versatile picture of muscle fatigue...
- Acceleration patterns of the head and pelvis when walking are associated with risk of falling in community-dwelling older people
Hylton B Menz
Prince of Wales Medical Research Institute, University of New South Wales, High Street, Randwick, NSW 2031, Australia
J Gerontol A Biol Sci Med Sci 58:M446-52. 2003
..This study evaluated acceleration patterns of the head and pelvis when walking on a level and an unpredictably irregular surface to determine ..
- Attenuation of human neck muscle activity following repeated imposed trunk-forward linear acceleration
Jean Sébastien Blouin
PEPS, Local 00212, Division de kinesiologie, Universite Laval, G1K 7P4, Quebec, Quebec, Canada
Exp Brain Res 150:458-64. 2003
It has been suggested that, after a passive linear acceleration of a seated subject which resembles a small, rear-end car impact, sensory information from proprioceptive, vestibular, and visual systems elicit stabilizing neck muscular ..
- Motor unit acceleration maps and interference mechanomyographic distribution
Department of Health Science and Technology, Center for Sensory Motor Interaction SMI, Aalborg University, Fredrik Bajers Vej 7D 3, 9220 Aalborg, Denmark
J Biomech 41:2843-9. 2008
..using the intramuscular single motor unit action potentials as trigger in order to obtain surface motor unit acceleration maps (MUAMs). The peak-to-peak value of the averaged MMG depended on motor unit location (P<0...
- Arm position during daily activity
Laboratory of Movement Analysis and Measurement, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
Gait Posture 28:581-7. 2008
..The proposed technique could be used in a number of shoulder diseases where problems in performing daily activities should be expressed in terms of objective measure of arm position...
- Minimum acceleration criterion with constraints implies bang-bang control as an underlying principle for optimal trajectories of arm reaching movements
Department of Electrical Engineering, Technion Israel Institute of Technology, Haifa, Israel
Neural Comput 20:779-812. 2008
..How are these movements planned? A minimum acceleration criterion has been examined in the past, and the solution obtained, based on the Euler-Poisson equation, failed ..
- Calibration of rotational acceleration for the rotarod test of rodent motor coordination
Department of Psychology, University of North Carolina at Greensboro, NC 27402 6170, USA
J Neurosci Methods 178:10-4. 2009
..protocols, or laboratory environmental factors beyond the test itself, but it is also possible that the actual acceleration rates of the different rods do not correspond to the nominal rates set on the devices...
- Determination of ion and neutral loss compositions and deconvolution of product ion mass spectra using an orthogonal acceleration time-of-flight mass spectrometer and an ion correlation program
Andrew H Grange
U S EPA, ORD, NERL, Environmental Sciences Division, PO Box 93478, Las Vegas, NV 89193 3478, USA
Rapid Commun Mass Spectrom 20:89-102. 2006
..For a series of 34 exact mass measurements, an orthogonal acceleration time-of-flight mass spectrometer provided 34 and 29 values accurate to within 2 and 1 mDa, respectively, for ..
- Classification of gait patterns in the time-frequency domain
M N Nyan
Department of Mechanical Engineering, National University of Singapore, Singapore
J Biomech 39:2647-56. 2006
..powers of wavelet coefficients of 2 s time duration from separated segments of vertical and antero-posterior acceleration signals were used as features in classification...
- Standardization of measuring power output during wheelchair propulsion on a treadmill Pitfalls in a multi-center study
S de Groot
Rehabilitation Center Amsterdam, The Netherlands
Med Eng Phys 28:604-12. 2006
..The purpose of this study was to investigate what causes the differences in drag force among centers...
- Control of ground reaction forces by hindlimb muscles during cat locomotion
Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
J Biomech 39:2752-66. 2006
..We concluded from these results that MG and PL are primarily responsible for the control of the direction of the GRF, while SOL primarily functions as an anti-gravity muscle, and VL as an acceleration/deceleration muscle.