acceleration

..of the human brain was measured in tagged magnetic resonance images (MRI) obtained dynamically during angular acceleration of the head...

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..The purpose of this review is to address important methodological issues related to conducting accelerometer-based assessments of physical activity in free-living individuals...

..It is concluded that the ambulatory measurement system was able to reliably estimate foot placement during walking...

..To this purpose, acceleration patterns of the trunk and their relationships with spatio-temporal gait parameters were analysed in healthy ..

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..Finally this paper reviews and compares existing commercial products to provide a comprehensive outlook of current development status and possible emerging technologies...

The purpose of this study was to describe the characteristics of stroke patient gait using the acceleration signals which were obtained during walking...

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...

..This wearable system uses on-body acceleration sensors to measure the patients' movements...

..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...

..8 degrees and RMSE(d) = 30.0 cm for an integration interval of two gait cycles (an improvement of 11 degrees and 262 cm)...

..Secondly, to determine the effects that acceleration and frequency have on these reliability measures.

..To examine the reproducibility of a triaxial seismic accelerometer under controlled conditions and real-life conditions...

..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...

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..The aim of this study was to examine the duration of physical activity (PA) bouts in prepubertal children with high-frequency accelerometry monitoring...

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..To review the clinimetric quality of motion sensors used to assess physical activity in healthy children and adolescents (2-18 years)...

..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)...

..69 (0.10) m, 70 (14) kg]. Acceleration (along the longitudinal axis of the trunk) and HR were measured simultaneously...

..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...

..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...

..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...

..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...

..2. The deployment of data loggers that measure acceleration is emerging as a powerful tool for quantifying the behaviour of free-living animals...

..Conscious rats were subjected to sinusoidal linear acceleration along the vertical plane...

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 ..

..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...

..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...

..It is suggested that triaxial accelerometers (RT3) are superior to single-plane accelerometers for predicting energy expenditure (EE)...

..Finally the concept of direct measurement by accelerometry is presented with past studies and modern techniques used for data analysis...

..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...

..This study indicates that sprint skiers should emphasize sport-specific upper body training, and training skiing economy at high speeds...

..It is therefore recommended to use a non-wear activity diary for gaining insight into the physical activity levels of individuals...

..Direct comparisons are made between a mixed model regression approach and an approach based on receiver operator characteristic curves...

..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...

..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...

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.

..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 ..

..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 ..

..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 ..

..We show that the inversion effect is correlated with the difference in vertical acceleration between the constituent fragments of each stimulus...

..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...

..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...

..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...

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..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 ..

..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...

..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...

..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...

..An analysis of trunk acceleration data produced temporal gait parameters (duration of subsequent stride cycles and left/right steps) and ..

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...

..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 ..

..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...

..However, the underlying physiological events that give rise to the acceleration signal are poorly understood...

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..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...

..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...

..was experimentally modulated using 34 different anterior-posterior support-surface translations of varying peak acceleration and velocity but the same total displacement...

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 ..

..Human head acceleration data for a range of impact severities were collected by instrumenting the helmets of collegiate football ..

..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...

..theories, the aim of this study was to develop and test a daily impact score (DIS) using long-term continuous acceleration measurements of exercise...

..This method is therefore suitable for automatic identification some disease, for example arrhythmia or sleep apnea...

..In the following series of experiments, we used the Marmarou impact-acceleration head injury model (with a 500-g, 1...

Although of prime ecological relevance, acceleration capacity is a poorly understood locomotor performance trait in terrestrial vertebrates...

..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)...

The vestibular system responds to head acceleration by producing compensatory reflexes in the eyes and postural muscles...

Rapid acceleration and deceleration are vital for survival in many predator and prey animals and are important attributes of animal and human athletes...

..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...

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...

..running distance, peak accelerations, time); and 2) interactions (for instance, if vBMD prediction by peak acceleration depends on running distance)...

..Studies on efficiency and therapeutic window of neuroprotective pharmacological molecules are now conceivable to ameliorate severe head-injury treatment...

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)...

..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 ..

Periodic z-axis acceleration (pGz)-CPR involves an oscillating motion of a whole patient in the head-to-foot dimension on a mechanized table...

..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...

We investigated how substrate diameter affects acceleration performance in three Anolis lizard species (A. sagrei, A. carolinensis and A...

..To measure the vibratory response of the fetal head and abdominal wall in sheep during vibroacoustic stimulation...

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)...

..Three PAEE-prediction models derived using the current data, and five previously published prediction models were cross-validated to estimate PAEE in this sample...

..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...

..Pedometers, however, can be confidently used with ostensibly healthy older adult populations for both assessment and motivation purposes...

..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...

..Our findings support the hypothesis that upward eye velocity during yaw results from AC excitation, which must normally be suppressed by the intact cerebellum...

..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...

..In most clinical scenarios, DAI is caused by these two forms of acceleration in combination...

..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...

..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...

..This study evaluated acceleration patterns of the head and pelvis when walking on a level and an unpredictably irregular surface to determine ..

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 ..

..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...

..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...

..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 ..

..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...

..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 ..

..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...

..The purpose of this study was to investigate what causes the differences in drag force among centers...

..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.

..Principal among these parameters, and in addition to the mechanical closure forces are displacement, velocity, acceleration and the trajectory of pelvic floor landmarks...

..to a widely help paradigm, our work shows that PS molecules, not a membrane surface, trigger this remarkable acceleration. This has eluded researchers because PS is located in membranes where protein structure and interactions are ..

..to a widely help paradigm, our work shows that PS molecules, not a membrane surface, trigger this remarkable acceleration. This has eluded researchers because PS is located in membranes where protein structure and interactions are ..

..GLUTs 1 and 3 show "trans-acceleration" - accelerated sugar uptake in cells preloaded with sugar. GLUTs 2 and 4 do not...

..GLUTs 1 and 3 show "trans-acceleration" - accelerated sugar uptake in cells preloaded with sugar. GLUTs 2 and 4 do not...

..nucleotide cycle have been made clear over the past decade, including intrinsic GTP hydrolysis by G? and acceleration of this hydrolysis (`GAP activity') by RGS domains; however, the precise structural determinants ..

..nucleotide cycle have been made clear over the past decade, including intrinsic GTP hydrolysis by G? and acceleration of this hydrolysis (`GAP activity') by RGS domains;however, the precise structural determinants underlying ..

..nucleotide cycle have been made clear over the past decade, including intrinsic GTP hydrolysis by G? and acceleration of this hydrolysis (`GAP activity') by RGS domains;however, the precise structural determinants underlying ..

..In other inflammatory bone diseases these cells have been reported to contribute to the acceleration of bone resorption by the production of proinflammatory cytokines including tumor necrosis factor (TNF)-, ..

..We have recently discovered that conditional induction of mMix in ES cell-derived embryoid bodies results in acceleration of the mesodermal developmental program...

..We have recently discovered that conditional induction of mMix in ES cell-derived embryoid bodies results in acceleration of the mesodermal developmental program...

..cells reflect the necessary canal/otolith interactions that are necessary to separate net gravitoinertial acceleration into gravitational and translational components...

..cells reflect the necessary canal/otolith interactions that are necessary to separate net gravitoinertial acceleration into gravitational and translational components...

..As women increasingly delay attempts at pregnancy into their 30s and beyond, any acceleration of reproductive aging has dire consequences for the possibility of successful pregnancy and the risk of birth ..

..The increased accuracy of the new methods and the acceleration they provide to the analysis of complex data are fueling demand for this new technology...

..In addition, heart rate variation such as short-long-short cycle length (pause-dependent mode) or acceleration of heart rates often precedes TdPs formation, suggesting that generation of EADs and dispersion of ..

..In addition, heart rate variation such as short-long-short cycle length (pause-dependent mode) or acceleration of heart rates often precedes TdPs formation, suggesting that generation of EADs and dispersion of ..

..A recent study demonstrated DCS acceleration of extinction of cocaine-induced conditioned place preference in rats...

..A recent study demonstrated DCS acceleration of extinction of cocaine-induced conditioned place preference in rats...

..efforts over the past 100 years have been directed at the peristaltic reflex, which is responsible for the acceleration of intestinal transit and are known to be mediated by 5-HT...

..components of the inner ear are fluid-filled chambers that function to detect sound waves and gravity/acceleration/movement, respectively...

..e. inflammation and platelet dependent acceleration of vascular procoagulant pathways...

..Incorporation of factor Va into prothrombinase and its interaction with factor Xa results in a 300,000-fold acceleration of the catalytic efficiency of the enzyme as compared to the catalysis of the reaction by factor Xa alone...

..processing speed are manifested as changes in the slope of the tachometric curve (psychophysically) and in the acceleration of the oculomotor activity associated with a saccadic choice (neurally)...

..Linear acceleration and angular velocity of the measured leg are processed by SAGE software (SAGE-S) to provide an accurate measure ..

..Several factors including microgravity, lack of load-bearing, stress, acceleration forces, and irradiation have been proposed to contribute to the changes of the immune system...

..The use of translation motion as a natural stimulus will allow evaluation of linear acceleration responses of central vestibular neurons without the confounding effects of co-acting angular acceleration of ..

Cardiovascular pathologies in diabetic patients are caused by the acceleration of atherosclerosis...

..The mechanical stimuli of interest are fluid shear stress and fluid acceleration, two forces imparted to the capillary wall by flowing blood...

..We now propose to elucidate the relationship between renal senescence and acceleration of chronic allograft nephropathy (CAN) in recipients of aged cadaveric transplants...