- 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 triaxial accelerometer and portable data processing unit for the assessment of daily physical activity
C V Bouten
University of Technology, Division of Computational and Experimental Mechanics, Eindhoven, The Netherlands
IEEE Trans Biomed Eng 44:136-47. 1997
..and can be used to register accelerations covering the amplitude and frequency ranges of human body acceleration. Interinstrument and test-retest experiments showed that the offset and the sensitivity of the TA were equal ..
- Sources of variance in daily physical activity levels as measured by an accelerometer
Charles E Matthews
Department of Epidemiology and Biostatistics, Norman J Arnold School of Public Health, University of South Carolina, Columbia, SC 29208, USA
Med Sci Sports Exerc 34:1376-81. 2002
..To examine sources of variance in objective measures of physical activity in a group of healthy adults (N = 92) participating in a physical activity measurement study...
- 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-determined steps per day in US adults
Pennington Biomedical Research Center, Baton Rouge, LA 70808, USA
Med Sci Sports Exerc 41:1384-91. 2009
..This accelerometer is known to have a lower sensitivity threshold than accepted pedometers, leading to relatively higher step estimates...
- 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...
- Tri-axial dynamic acceleration as a proxy for animal energy expenditure; should we be summing values or calculating the vector?
Biological Sciences, College of Science, Swansea University, Swansea, Wales, United Kingdom
PLoS ONE 7:e31187. 2012
Dynamic body acceleration (DBA) has been used as a proxy for energy expenditure in logger-equipped animals, with researchers summing the acceleration (overall dynamic body acceleration--ODBA) from the three orthogonal axes of devices...
- The origin of modern frogs (Neobatrachia) was accompanied by acceleration in mitochondrial and nuclear substitution rates
Department of Biodiversity and Evolutionary Biology, Museo Nacional de Ciencias Naturales, CSIC, Jose Gutierrez Abascal 2, 28006, Madrid, Spain
BMC Genomics 13:626. 2012
..Although several earlier studies showed that modern frogs (Neobatrachia) experienced an acceleration of mitochondrial gene substitution rates compared to non-neobatrachian relatives, no further characterization ..
- 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 ..
- Energy cost and metabolic power in elite soccer: a new match analysis approach
School of Sport Sciences, University of Udine, Udine, Italy
Med Sci Sports Exerc 42:170-8. 2010
..We propose a more detailed assessment of soccer players' metabolic demands by video match analysis with the aim of also taking into account accelerations...
- Using tri-axial acceleration data to identify behavioral modes of free-ranging animals: general concepts and tools illustrated for griffon vultures
Movement Ecology Laboratory, Department of Ecology, Evolution and Behavior, Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
J Exp Biol 215:986-96. 2012
..We focus on the use of tri-axial acceleration (ACC) data to identify behavioral modes of GPS-tracked free-ranging wild animals and demonstrate its ..
- Walking speed, cadence and step length are selected to optimize the stability of head and pelvis accelerations
Mark D Latt
Department of Geriatric Medicine, Westmead Hospital, Westmead, NSW, Australia
Exp Brain Res 184:201-9. 2008
..b>Acceleration patterns of the head and pelvis were recorded in ten healthy young adults as they walked on a level surface in ..
- 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.
- Pedestrian Tracking with shoe-mounted inertial sensors
IEEE Comput Graph Appl 25:38-46. 2005
- Accelerometers in rehabilitation medicine for older adults
K M Culhane
Biomedical Electronics Laboratory, Department of Electronic and Computer Engineering, University of Limerick, Limerick, Ireland
Age Ageing 34:556-60. 2005
..The challenge facing clinicians and biomedical engineers is to further harness this technology making it part of everyday clinical practice...
- 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...
- 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 ..
- 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...
- 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...
- Levels and patterns of objectively assessed physical activity--a comparison between Sweden and the United States
Department of Neurobiology, Karolinska Institutet, Huddinge, Sweden
Am J Epidemiol 171:1055-64. 2010
..These results provide a framework for international comparisons of physical activity levels and patterns, and they represent strong evidence for the importance of investment in objective measurement of physical activity...
- Age-related differences in walking stability
Hylton B Menz
Prince of Wales Medical Research Institute, High Street, Randwick, New South Wales 2031, Australia
Age Ageing 32:137-42. 2003
..a large proportion of falls in older people occur when walking; however the mechanisms underlying impaired balance during gait are poorly understood...
- 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...
- 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...
- Ambulatory position and orientation tracking fusing magnetic and inertial sensing
Biomedical Technology Institute, University of Twente, Enschede 7500 AE, The Netherlands
IEEE Trans Biomed Eng 54:883-90. 2007
..The accuracy was about 5 mm for position and 3 degrees for orientation measurements. Errors were higher during movements with high velocities due to relative movement between source and sensor within one cycle of magnetic actuation...
- 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)...
- 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
- 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
- Representation of visual gravitational motion in the human vestibular cortex
Department of Neuromotor Physiology, Scientific Institute Foundation Santa Lucia, Via Ardeatina 306, 00179 Rome, Italy
Science 308:416-9. 2005
..The acceleration of visual targets was manipulated while brain activity was measured using functional magnetic resonance imaging...
- 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...
- 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...
- 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 (1985) 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...
- 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)...
- 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...
- Acceleration patterns of the head and pelvis during gait in older people with Parkinson's disease: a comparison of fallers and nonfallers
Mark D Latt
Department of General, Geriatric and Rehabilitation Medicine, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
J Gerontol A Biol Sci Med Sci 64:700-6. 2009
..Although several studies have evaluated differences in basic gait parameters in people with PD, none have directly evaluated the stability of the upper body during gait...
- Measurement of head impacts in collegiate football players: relationship between head impact biomechanics and acute clinical outcome after concussion
Kevin M Guskiewicz
Department of Exercise and Sport Science, Curriculum in Human Movement Science, The University of North Carolina, Chapel Hill, North Carolina 27599, USA
Neurosurgery 61:1244-52; discussion 1252-3. 2007
- Similar muscles contribute to horizontal and vertical acceleration of center of mass in forward and backward walking: implications for neural control
Research Center for Movement Control and Neuroplasticity, Department of Biomedical Kinesiology, Katholieke Universiteit Leuven, Leuven, Belgium
J Neurophysiol 107:3385-96. 2012
..In the present study, forward simulations were used to study the effects of muscles on the acceleration of COM in FW and BW...
- 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...
- Patterns of objectively measured physical activity in the United States
Jesse S Metzger
Departments of Epidemiology, University of North Carolina Chapel Hill, Chapel Hill, NC, USA
Med Sci Sports Exerc 40:630-8. 2008
..We used latent class analysis (LCA) to assess patterns of physical activity among adults, using the 7 d of accelerometer data from the 2003-2004 NHANES...
- The effect of gait speed on lateral balance control during walking in healthy elderly
Jorunn L Helbostad
Section of Physiotherapy Science, Faculty of Medicine, University of Bergen, Bergen, Norway
Gait Posture 18:27-36. 2003
..5 years, S.D.=3.2 years), walking at four different self-administered speeds, mediolateral trunk acceleration and step width (SW), but not step-width variability (SWV), were found to have quadratic relations to gait speed...
- 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...
- Interstride trunk acceleration variability but not step width variability can differentiate between fit and frail older adults
The Balance and Gait Unit, Section of Physiotherapy Science, Department of Public Health and Primary Health Care, University of Bergen, Ulriksdal 8c Bergen, N 5009 Norway
Gait Posture 21:164-70. 2005
..In this study we examined the role of step width variability (SWV) and interstride trunk acceleration variability in two groups of fit and frail old people...
- Comparing the performance of three generations of ActiGraph accelerometers
Megan P Rothney
Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
J Appl Physiol (1985) 105:1091-7. 2008
..Furthermore, the algorithms for energy expenditure predictions developed using older 7164 monitors may need to be modified for the GT1M...
- Brain injury prediction: assessing the combined probability of concussion using linear and rotational head acceleration
Center for Injury Biomechanics, Virginia Tech Wake Forest, 440 ICTAS Building, Stanger St, Blacksburg, VA 24061, USA
Ann Biomed Eng 41:873-82. 2013
..In the HITS dataset, the combined probability of concussion and linear acceleration were significantly better predictors of concussion than rotational acceleration alone, but not different from ..
- Inertial sensor-based knee flexion/extension angle estimation
Centre for Rehabilitation and Human Performance Research, University of Salford, UK
J Biomech 42:2678-85. 2009
A new method for estimating knee joint flexion/extension angles from segment acceleration and angular velocity data is described...
- Discrimination of walking patterns using wavelet-based fractal analysis
Department of Gerontechnology, National Institute for Longevity Sciences, Ohbu, Aichi 474 8522, Japan
IEEE Trans Neural Syst Rehabil Eng 10:188-96. 2002
In this paper, we attempted to classify the acceleration signals for walking along a corridor and on stairs by using the wavelet-based fractal analysis method...
- 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...
- Multiple reference frames for motion in the primate cerebellum
Aasef G Shaikh
Department of Neurobiology, Washington University School of Medicine, St Louis, Missouri 63110, USA
J Neurosci 24:4491-7. 2004
..This differential representation of motion-related information implies potential differences in the functional roles of these areas...
- Validity and reliability of GPS for measuring instantaneous velocity during acceleration, deceleration, and constant motion
Matthew C Varley
Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, Victoria, Australia
J Sports Sci 30:121-7. 2012
..and reliability of 5 and 10 Hz global positioning systems (GPS) for measuring instantaneous velocity during acceleration, deceleration, and constant velocity while straight-line running...
- Increased high-intensity activity in elite Australian football finals matches
Robert J Aughey
Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, Australia
Int J Sports Physiol Perform 6:367-79. 2011
..Players aim to be in peak physical condition for finals, with anecdotal evidence of increased speed and pressure of these games...
- 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
- 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...
- Reciprocal angular acceleration of the ankle and hip joints during quiet standing in humans
Educational Physiology Laboratory, Graduate School of Education, The University of Tokyo, Japan
Exp Brain Res 136:463-73. 2001
..Further, measurement error was not predominant, even among the angular acceleration data, which were obtained by taking the second derivative of the angular displacement...
- Perception of tilt (somatogravic illusion) in response to sustained linear acceleration during space flight
Centre de Recherche Cerveau et Cognition, CNRS UPS, Toulouse, France
Exp Brain Res 138:410-8. 2001
..the Gy (interaural) axis, induced illusions of roll-tilt of 20 degrees and 34 degrees for gravito-inertial acceleration (GIA) vector tilts of 27 degrees and 45 degrees , respectively. Pre-flight 0...
- 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
- The landing-take-off asymmetry in human running
G A Cavagna
Istituto di Fisiologia Umana, Universita degli Studi di Milano, Via Mangiagalli, 32, 20133 Milan, Italy
J Exp Biol 209:4051-60. 2006
..positive work phase, due to the muscular push continuing to accelerate the body forwards after the end of the acceleration upwards...
- Reliability of segmental accelerations measured using a new wireless gait analysis system
Justin J Kavanagh
School of Physiotherapy and Exercise Science, Griffith University, PMB 50 Gold Coast Mail Centre 9726, Gold Coast, Queensland, Australia
J Biomech 39:2863-72. 2006
..Furthermore, differences in acceleration waveform repeatability associated with the reapplication of accelerometers were small in relation to normal ..
- 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...
- 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...
- Vestibular signals in primate thalamus: properties and origins
Department of Anatomy and Neurobiology, Washington University School of Medicine, St Louis, Missouri 63110, USA
J Neurosci 27:13590-602. 2007
..01-4 Hz. During translation, neurons encoded combinations of linear acceleration and velocity...
- 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...
- 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
- 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...
- 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...
- 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...
- 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...
- 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...
- 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
..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)...
- 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...
- Distance to achieve steady state walking speed in frail elderly persons
Robert Bosch Hospital, Department of Geriatric Rehabilitation, 70376, Stuttgart, Germany
Gait Posture 27:91-6. 2008
..On average, participants reached a walking speed of 0.66 m/s after an acceleration phase of 1.43 m (89% after 2.47 m)...
- Estimation and visualization of sagittal kinematics of lower limbs orientation using body-fixed sensors
Ecole Polytechnique Federale de Lausanne EPFL, Laboratory of Movement Analysis and Measurement, 1015 Lausanne, Switzerland
IEEE Trans Biomed Eng 53:1385-93. 2006
..Finally, a gait analysis tool was designed to visualize the motion data as synthetic skeletons performing the same actions as the subjects...
- 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...
- 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...
- Head impact severity measures for evaluating mild traumatic brain injury risk exposure
Richard M Greenwald
Simbex, Lebanon, New Hampshire, USA
Neurosurgery 62:789-98; discussion 798. 2008
The aims of this study were to quantify the sensitivity of various biomechanical measures (linear acceleration, rotational acceleration, impact duration, and impact location) of head impact to the clinical diagnosis of concussion in ..
- 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...
- 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
- 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...
- 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...
- 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 ..
- 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...
- 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)...
- 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...
- 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...
- 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...
- 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...
- 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...
- 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...
- 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...
- 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; ..
- 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...