- 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...
- 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...
- Accelerometry: a technique for quantifying movement patterns during walking
Justin J Kavanagh
School of Physiotherapy and Exercise Science, Griffith University, Gold Coast Campus, PMB 50 Gold Coast Mail Centre, Queensland 9726, Australia
Gait Posture 28:1-15. 2008
..the use of accelerometer technology to investigate gait-related movement patterns, and addresses issues of acceleration measurement important for experimental design...
- 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...
- Quantitative relationship between axonal injury and mechanical response in a rodent head impact acceleration model
Department of Biomedical Engineering, Wayne State University, Detroit, Michigan 48201, USA
J Neurotrauma 28:1767-82. 2011
A modified Marmarou impact acceleration model was developed to study the mechanical responses induced by this model and their correlation to traumatic axonal injury (TAI)...
- Pedestrian Tracking with shoe-mounted inertial sensors
IEEE Comput Graph Appl 25:38-46. 2005
- 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.
- 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...
- 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
- Energy expenditure estimated by accelerometry and doubly labeled water: do they agree?
Nicole Y Leenders
Sport and Exercise Sciences Section, School of Physical Activity and Educational Services, Ohio State University, Columbus, OH 43210 1228, USA
Med Sci Sports Exerc 38:2165-72. 2006
..The purpose of this study was to compare energy expenditure derived from regression equations determined from accelerometry with energy expenditure obtained from the doubly labeled water method (DLW)...
- 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 ..
- 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
- 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
- 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...
- How soccer players head the ball: a test of Optic Acceleration Cancellation theory with virtual reality
Department of Experimental Psychology, South Parks Road, Oxford OX1 3UD, UK
Vision Res 48:1479-87. 2008
..claim that players intercepting balls use servo control strategies and are consistent with the particular claim of Optic Acceleration Cancellation theory that the servo strategy is to allow alpha to increase at a steadily decreasing rate.
- Vestibular heading discrimination and sensitivity to linear acceleration in head and world coordinates
Paul R MacNeilage
Department of Anatomy and Neurobiology, Washington University School of Medicine, St Louis, Missouri 63110, USA
J Neurosci 30:9084-94. 2010
..e., heading. The vestibular cue to heading is the direction of inertial acceleration that accompanies transient linear movements. This cue is transduced by the otolith organs...
- Comparison of acceleration signals of simulated and real-world backward falls
Robert Bosch Hospital, Department of Clinical Gerontology, Stuttgart, Germany
Med Eng Phys 33:368-73. 2011
..Variation of acceleration and maximum jerk of 5 real-world backward falls of 4 older persons (mean age 68...
- Estimation of daily energy expenditure in pregnant and non-pregnant women using a wrist-worn tri-axial accelerometer
Vincent T van Hees
Medical Research Council Epidemiology Unit, Institute of Metabolic Science, Cambridge, United Kingdom
PLoS ONE 6:e22922. 2011
- Sensitivity and specificity of fall detection in people aged 40 years and over
Department of Medical Technology, Institute of Biomedicine, University of Oulu, Oulu, Finland
Gait Posture 29:571-4. 2009
..5% and a specificity of 100%. This suggests that the present concept provides an effective method for automatic fall detection...
- 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...
- Maturation of otolith-related brainstem neurons in the detection of vertical linear acceleration in rats
Suk King Lai
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...
- The generalized optic acceleration cancellation theory of catching
Department of Experimental Psychology, Oxford University, Oxford, England
J Exp Psychol Hum Percept Perform 32:139-48. 2006
The generalized optic acceleration cancellation (GOAC) theory of catching proposes that the path of a fielder running to catch a ball is determined by the attempt to satisfy 2 independent constraints...
- Acceleration-based gait test for healthy subjects: reliability and reference data
Atrium Medical Center, Department of Orthopaedics and Traumatology, Heerlen, Henri Dunantstraat 5, Heerlen, P O Box 4446, 6401 CX Heerlen, The Netherlands
Gait Posture 30:192-6. 2009
..The aim of this study was to present an acceleration-based reference database for healthy gait...
- 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
..A new integrated system of 5 accelerometers was tested for reliability and compared to a footswitch system to determine if the accelerometers offered a practical option for the acquisition of spatiotemporal gait parameters...
- 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)...
- 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...
- 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...
- Reliability and clinical correlates of 3D-accelerometry based gait analysis outcomes according to age and fall-risk
Gerontology, Vrije Universiteit Brussel, Laarbeeklaan 103, B 1090 Brussels, Belgium
Gait Posture 33:366-72. 2011
..To investigate the reliability of a 3D-accelerometry based gait analysis, and its correlates with clinical status and fall-risk...
- Comparison of the performance of the activPAL Professional physical activity logger to a discrete accelerometer-based activity monitor
Biomedical Electronics Laboratory, Department of Electronic and Computer Engineering, University of Limerick, Limerick, Ireland
Med Eng Phys 29:930-4. 2007
- Evaluation of a fall detector based on accelerometers: a pilot study
Robert Bosch Krankenhaus, Department of Geriatric Rehabilitation, Stuttgart, Germany
Med Biol Eng Comput 43:548-51. 2005
..The sensitivity of the fall detection was assessed by investigation into the acceleration patterns of the head of a young volunteer during intentional falls...
- Controlling human upright posture: velocity information is more accurate than position or acceleration
Program in Neuroscience and Cognitive Science, University of Maryland, College Park, MD 20742 2611, USA
J Neurophysiol 92:2368-79. 2004
..g., velocity, acceleration) information for estimation of body dynamics...
- 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)...
- 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...
- 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...
- 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...
- Hierarchy of individual calibration levels for heart rate and accelerometry to measure physical activity
MRC Epidemiology Unit, Cambridge CB1 9NL, UK
J Appl Physiol (1985) 103:682-92. 2007
..69 (0.10) m, 70 (14) kg]. Acceleration (along the longitudinal axis of the trunk) and HR were measured simultaneously...
- Calibration of accelerometer output for children
Department of Exercise Science, University of Massachusetts, Amherst, MA 01003, USA
Med Sci Sports Exerc 37:S523-30. 2005
..Alternative data processing using the raw acceleration signal is recommended as a possible alternative approach where the actual acceleration pattern is used to ..
- 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...
- Nonexercise movement in elderly compared with young people
Ann M Harris
Endocrine Research Unit, Mayo Clinic, Rochester, MN 55905, USA
Am J Physiol Endocrinol Metab 292:E1207-12. 2007
..Total nonexercise movement (acceleration arbitrary units), standing time, and standing acceleration were significantly lower in the elderly subjects; ..
- Analysis of real-time head accelerations in collegiate football players
Stefan M Duma
Virginia Tech Wake Forest Center for Injury Biomechanics, Blacksburg, VA 24061, USA
Clin J Sport Med 15:3-8. 2005
..To measure and analyze head accelerations during American collegiate football practices and games...
- Reducing impact loading during running with the use of real-time visual feedback
Harrison Philip Crowell
US Army Research Laboratory, RDRL HRS B, Aberdeen Proving Ground, MD 21005 5425, USA
J Orthop Sports Phys Ther 40:206-13. 2010
..Single-subject with repeated measures...
- Concussion in professional football: reconstruction of game impacts and injuries
Elliot J Pellman
ProHEALTH Care Associates, LLP, Lake Success, New York, USA
Neurosurgery 53:799-812; discussion 812-4. 2003
..Concussion in professional football was studied with respect to impact types and injury biomechanics. A combination of video surveillance and laboratory reconstruction of game impacts was used to evaluate concussion biomechanics...
- Specificity of acceleration, maximum speed, and agility in professional soccer players
Sport, Health and Exercise, Staffordshire University, Stoke on Trent, Staffordshire, UK
J Strength Cond Res 19:76-8. 2005
..actions are known to impact soccer performance and can be categorized into actions requiring maximal speed, acceleration, or agility...
- Head impacts during high school football: a biomechanical assessment
Steven P Broglio
Department of Kinesiology and Community Health, University of Illinois at Urbana Champaign, Champaign, IL 61801, USA
J Athl Train 44:342-9. 2009
..Little is known about the impact biomechanics sustained by players during interscholastic football...
- The need for speed: testing acceleration for estimating animal travel rates in terrestrial dead-reckoning systems
Owen R Bidder
Biological Sciences, College of Science, Swansea University, Singleton Park, Swansea SA2 8PP, UK
Zoology (Jena) 115:58-64. 2012
..In the present study we evaluate the use of accelerometers and a metric known as overall dynamic body acceleration (ODBA) as a proxy for the measurement of speed for use in dead-reckoning...
- Fast and efficient fully 3D PET image reconstruction using sparse system matrix factorization with GPU acceleration
Department of Biomedical Engineering, University of California, Davis, CA 95616, USA
Phys Med Biol 56:6739-57. 2011
..we present a method to address this problem using sparse matrix factorization and graphics processor unit (GPU) acceleration. We factor the accurate system matrix into three highly sparse matrices: a sinogram blurring matrix, a ..
- Field evaluation of energy expenditure in women using Tritrac accelerometers
Kristin L Campbell
School of Human Kinetics, University of British Columbia, Vancouver, BC, Canada
Med Sci Sports Exerc 34:1667-74. 2002
..To investigate the use of Tritrac accelerometers to measure energy expenditure (EE) of various activities for women in the field setting, as compared with portable indirect calorimetry...
- Developmental maturation of ionotropic glutamate receptor subunits in rat vestibular nuclear neurons responsive to vertical linear acceleration
Suk King Lai
Department of Physiology, LKS Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong, China
Eur J Neurosci 28:2157-72. 2008
..of ionotropic glutamate receptors in vestibular nuclear neurons that were activated by sinusoidal linear acceleration along the vertical plane...
- An instrumented timed up and go: the added value of an accelerometer for identifying fall risk in idiopathic fallers
Laboratory for Gait and Neurodynamics, Movement Disorders Unit, Department of Neurology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
Physiol Meas 32:2003-18. 2011
..3 ± 9.1 years) performed the TUG while wearing a 3D-accelerometer on the lower back. Acceleration-derived parameters included Sit-to-Stand and Stand-to-Sit times, amplitude range (Range), and slopes (Jerk)...
- Performance and scalability of Fourier domain optical coherence tomography acceleration using graphics processing units
School of Engineering Sciences, Simon Fraser University, V5A 1S6 Burnaby, BC, Canada
Appl Opt 50:1832-8. 2011
..Finally, we discuss how the performance trends of GPU-based accelerators compare to the expected future requirements of FD-OCT data rates...
- Activity-monitor accuracy in measuring step number and cadence in community-dwelling older adults
P Margaret Grant
School of Health and Social Care, Glasgow Caledonian University, Glasgow, UK
J Aging Phys Act 16:201-14. 2008
..The activPAL monitor accurately recorded step number and cadence. Combined with its ability to identify primary postures, the activPAL might be a useful and versatile device for measuring activity in older adults...
- Convergent evolution in locomotory patterns of flying and swimming animals
Adrian C Gleiss
Department of Biosciences, College of Science, Swansea University, Singleton Park Swansea SA2 8PP, UK
Nat Commun 2:352. 2011
..Energetically expensive large-scale migrations performed by many vertebrates provide common selection pressure for efficient locomotion, with potential for the convergence of locomotory strategies by a wide variety of species...
- 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...
- Visual neurons in the pigeon brain encode the acceleration of stimulus motion
Laboratory for Visual Information Processing, Institute of Biophysics, and Graduate School, Chinese Academy of Sciences, Beijing 100101, China
J Neurosci 24:7690-8. 2004
..Physically, motion is described by its acceleration, speed, and direction...
- All joint moments significantly contribute to trunk angular acceleration
Cameron R Nott
Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA
J Biomech 43:2648-52. 2010
..Each joint moment can produce linear and angular acceleration of all body segments (including those on which the moment does not directly act) due to the dynamic coupling ..
- Gait speed and step-count monitor accuracy in community-dwelling older adults
Kristi L Storti
Department of Epidemiology, University of Pittsburgh, Pittsburgh, PA, USA
Med Sci Sports Exerc 40:59-64. 2008
..Activity monitors are quite popular, although it has been suggested that they are less accurate at slow gait speeds...
- Validation of a wireless head acceleration measurement system for use in soccer play
Bioengineering Center, College of Engineering, Wayne State University, Detroit, MI, USA
J Appl Biomech 26:424-31. 2010
..The purpose of the current study is to validate a wireless head acceleration measurement system, head impact telemetry system (HITS) that can be used to collect head accelerations during ..
- Identifying sedentary time using automated estimates of accelerometer wear time
Elisabeth A H Winkler
School of Population Health, The University of Queensland, Brisbane, Australia
Br J Sports Med 46:436-42. 2012
..Direct effects on sedentary time (<100 cpm) and indirect effects on moderate-to-vigorous physical activity (MVPA, ≥1952 cpm) time were examined...
- Evaluation of waist-mounted tri-axial accelerometer based fall-detection algorithms during scripted and continuous unscripted activities
A K Bourke
Biomedical Electronics Laboratory, Department of Electronic and Computer Engineering, Faculty of Science and Engineering, University of Limerick, Limerick, Ireland
J Biomech 43:3051-7. 2010
..This algorithm is the most suitable method of fall-detection, when tested using continuous unscripted activities performed by elderly healthy volunteers, which is the target environment for a fall-detection device...
- Contribution of individual retinal ganglion cell responses to velocity and acceleration encoding
Department of Biology, Sensory Physiology Group, Carl von Ossietzky University Oldenburg, D 26111, Oldenburg, Germany
J Neurophysiol 98:2285-96. 2007
..ganglion cell (RGC) ensembles to simultaneously encode multiple aspects of visual motion: speed, direction, and acceleration of moving patterns...
- Calibration of the biotrainer pro activity monitor in children
Gregory J Welk
Department of Kinesiology, Iowa State University, Ames, IA 50011, USA
Pediatr Exerc Sci 19:145-58. 2007
..The cut point of 4 counts/min provides an ecologically valid cut point to capture physical activity in children using the Biotrainer Pro activity monitor...
- Predicting direction detection thresholds for arbitrary translational acceleration profiles in the horizontal plane
Department of Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Spemannstraße 38, 72076, Tubingen, Germany
Exp Brain Res 209:95-107. 2011
..detection thresholds have been measured and successfully modeled by exposing participants to sinusoidal acceleration profiles of different durations...
- The relationship between peak height velocity and physical performance in youth soccer players
Renaat M Philippaerts
Department of Movement and Sports Sciences, Ghent University, Ghent, Belgium
J Sports Sci 24:221-30. 2006
..Trainers and coaches should be aware of the individual characteristics of the adolescent growth spurt and the training load should also be individualized at this time...
- Action-perception dissociation in response to target acceleration
Department of Psychology, Wilfrid Laurier University, Waterloo, Ont N2L 3C5, Canada
Vision Res 42:1465-73. 2002
The purpose of this study was to investigate whether information about the acceleration characteristics of a moving target can be used for both action and perception...
- A body-fixed-sensor-based analysis of power during sit-to-stand movements
Center for Human Movement Sciences, University Medical Center Groningen, Groningen, The Netherlands
Gait Posture 31:272-8. 2010
..Similar approaches for assessing power may be developed for other mobility related activities, such as stair walking, or sports related activities such as jumping...
- Frequency and location of head impact exposures in individual collegiate football players
Joseph J Crisco
Department of Orthopaedics, The Warren Alpert Medical School of Brown University and Rhode Island Hospital, Providence, RI 02903, USA
J Athl Train 45:549-59. 2010
..Measuring head impact exposure is a critical step toward understanding the mechanism and prevention of sport-related mild traumatic brain (concussion) injury, as well as the possible effects of repeated subconcussive impacts...
- Swimming gaits, passive drag and buoyancy of diving sperm whales Physeter macrocephalus
Patrick J O Miller
Sea Mammal Research Unit, University of St Andrews, Fife, KY16 8LB, Scotland
J Exp Biol 207:1953-67. 2004
..One whale rested at approximately 10 m depth for more than 10 min without fluking, regulating its buoyancy by releasing air bubbles...
- 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 ..
- A wearable system for pre-impact fall detection
M N Nyan
Department of Mechanical Engineering, National University of Singapore, Singapore
J Biomech 41:3475-81. 2008
..2%. This is the longest lead-time achieved so far in pre-impact fall detection...
- 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)...
- 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...
- 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 ..
- 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...
- 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...
- 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...
- 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...
- 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...
- 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...
- 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...
- 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...
- 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...
- 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 ..
- 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...
- 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 ..
- 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 ..
- 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.
- 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...
- Evaluation of a threshold-based tri-axial accelerometer fall detection algorithm
A K Bourke
Biomedical Electronics Laboratory, Department of Electronic and Computer Engineering, University of Limerick, Limerick, Ireland
Gait Posture 26:194-9. 2007
..This was accomplished using a single threshold determined by the fall-event data-set, applied to the resultant-magnitude acceleration signal from a tri-axial accelerometer located at the trunk.
- 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
- 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...
- 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 ..
- 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...
- 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...