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https://www.readbyqxmd.com/read/29452755/machine-learning-algorithms-based-on-signals-from-a-single-wearable-inertial-sensor-can-detect-surface-and-age-related-differences-in-walking
#1
B Hu, P C Dixon, J V Jacobs, J T Dennerlein, J M Schiffman
The aim of this study was to investigate if a machine learning algorithm utilizing triaxial accelerometer, gyroscope, and magnetometer data from an inertial motion unit (IMU) could detect surface- and age-related differences in walking. Seventeen older (71.5 ± 4.2 years) and eighteen young (27.0 ± 4.7 years) healthy adults walked over flat and uneven brick surfaces wearing an inertial measurement unit (IMU) over the L5 vertebra. IMU data were binned into smaller data segments using 4-s sliding windows with 1-s step lengths...
January 12, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29452749/children-s-physical-activity-levels-during-organised-sports-practices
#2
Kate Ridley, Sara Zabeen, Belinda K Lunnay
OBJECTIVES: This study measured the physical activity levels of children during practice sessions of four popular organised sports in Australia. DESIGN: Cross-sectional observational design. METHODS: Participants comprised children from four local organised sports clubs in suburban Adelaide, South Australia. The sports examined were Australian Rules Football (AFL), girls' netball, boys' soccer and girls' soccer. Each participant wore a waist-mounted GT3X or GT3X+Actigraph accelerometer in either one or two of the practice sessions...
February 8, 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29449948/physical-activity-and-sedentary-behavior-following-pediatric-burns-a-preliminary-investigation-using-objective-activity-monitoring
#3
Moniek Akkerman, Leonora J Mouton, Laurien M Disseldorp, Anuschka S Niemeijer, Marco van Brussel, Lucas H V van der Woude, Marianne K Nieuwenhuis
Background: Adequate levels of regular physical activity (PA) are crucial for health and well-being. Pediatric burn injuries can have major physiological consequences in both the short and long term. The question is whether these consequences affect post burn PA levels. This study therefore aimed to describe PA and sedentary behavior (SB) in children and adolescents 1-5 years after burn injury. Methods: Daily PA and SB were monitored in 20 children and adolescents (12 boys and 8 girls, aged 6-17 years, with burns covering 10-37% of total body surface area, 1-5 years post burn) for 1 week using the ActiGraph GTX3+ accelerometer...
2018: BMC Sports Science, Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29447185/egg-turning-behavior-and-incubation-temperature-in-forster-s-terns-in-relation-to-mercury-contamination
#4
Gregory T Taylor, Joshua T Ackerman, Scott A Shaffer
Egg turning behavior is an important determinant of egg hatchability, but it remains relatively understudied. Here, we examined egg turning rates and egg temperatures in Forster's terns (Sterna forsteri). We used artificial eggs containing a data logger with a 3-D accelerometer, a magnetometer, and a temperature thermistor to monitor parental incubation behavior of 131 tern nests. Overall, adults turned their eggs an average (±SD) of 3.8 ± 0.8 turns h-1, which is nearly two times higher than that of other seabirds...
2018: PloS One
https://www.readbyqxmd.com/read/29445903/movement-kinematics-dynamically-modulates-the-rolandic-20-hz-rhythm-during-goal-directed-executed-and-observed-hand-actions
#5
B Marty, M Bourguignon, V Jousmäki, V Wens, S Goldman, X De Tiège
This study investigates whether movement kinematics modulates similarly the rolandic α and β rhythm amplitude during executed and observed goal-directed hand movements. It also assesses if this modulation relates to the corticokinematic coherence (CKC), which is the coupling observed between cortical activity and movement kinematics during such motor actions. Magnetoencephalography (MEG) signals were recorded from 11 right-handed healthy subjects while they performed or observed an actor performing the same repetitive hand pinching action...
February 14, 2018: Brain Topography
https://www.readbyqxmd.com/read/29444848/a-miniaturized-threshold-triggered-acceleration-data-logger-for-recording-burst-movements-of-aquatic-animals
#6
Nozomi Nishiumi, Ayane Matsuo, Ryo Kawabe, Nicholas Payne, Charlie Huveneers, Yuuki Y Watanabe, Yuuki Kawabata
Although animal-borne accelerometers are effective tools for quantifying the kinematics of animal behaviors, quantifying burst movements of small and agile aquatic animals remains challenging. To capture the details of burst movements, accelerometers need to sample at a very high frequency, which will inevitably shorten the recording duration or increase the device size. To overcome this problem, we developed a high-frequency acceleration data-logger that can be triggered by a manually-defined acceleration threshold, thus allowing the selective measurement of burst movements...
February 14, 2018: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29444169/monitoring-chest-compression-quality-during-cardiopulmonary-resuscitation-proof-of-concept-of-a-single-accelerometer-based-feedback-algorithm
#7
Digna María González-Otero, Jesus María Ruiz, Sofía Ruiz de Gauna, Jose Julio Gutiérrez, Mohamud Daya, James Knox Russell, Izaskun Azcarate, Mikel Leturiondo
BACKGROUND: The use of real-time feedback systems to guide rescuers during cardiopulmonary resuscitation (CPR) significantly contributes to improve adherence to published resuscitation guidelines. Recently, we designed a novel method for computing depth and rate of chest compressions relying solely on the spectral analysis of chest acceleration. That method was extensively tested in a simulated manikin scenario. The purpose of this study is to report the results of this method as tested in human out-of-hospital cardiac arrest (OHCA) cases...
2018: PloS One
https://www.readbyqxmd.com/read/29443824/improving-hip-worn-accelerometer-estimates-of-sitting-using-machine-learning-methods
#8
Jacqueline Kerr, Jordan Carlson, Suneeta Godbole, Lisa Cadmus-Bertram, John Bellettiere, Sheri Hartman
PURPOSE: To improve estimates of sitting time from hip worn accelerometers used in large cohort studies by employing machine learning methods developed on free living activPAL data. METHODS: Thirty breast cancer survivors concurrently wore a hip worn accelerometer and a thigh worn activPAL for 7 days. A random forest classifier, trained on the activPAL data, was employed to detect sitting, standing and sit-stand transitions in 5 second windows in the hip worn accelerometer...
February 13, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29440040/objectively-measured-physical-activity-sedentary-behaviour-and-all-cause-mortality-in-older-men-does-volume-of-activity-matter-more-than-pattern-of-accumulation
#9
Barbara J Jefferis, Tessa J Parsons, Claudio Sartini, Sarah Ash, Lucy T Lennon, Olia Papacosta, Richard W Morris, S Goya Wannamethee, I-Min Lee, Peter H Whincup
OBJECTIVES: To understand how device-measured sedentary behaviour and physical activity are related to all-cause mortality in older men, an age group with high levels of inactivity and sedentary behaviour. METHODS: Prospective population-based cohort study of men recruited from 24 UK General Practices in 1978-1980. In 2010-2012, 3137 surviving men were invited to a follow-up, 1655 (aged 71-92 years) agreed. Nurses measured height and weight, men completed health and demographic questionnaires and wore an ActiGraph GT3x accelerometer...
February 12, 2018: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29439704/novel-patterns-of-physical-activity-in-a-large-sample-of-preschool-aged-children
#10
Rachel M Ruiz, Evan C Sommer, Dustin Tracy, Jorge A Banda, Christina D Economos, Megan M JaKa, Kelly R Evenson, Maciej S Buchowski, Shari L Barkin
BACKGROUND: Moderate-to-vigorous physical activity (MVPA), shown to be associated with health benefits, is not well-characterized in preschool-aged children. MVPA is commonly described as a threshold amount to achieve. We examined a novel way to characterize MVPA patterns in preschool-aged children by gender and age. METHODS: Preschool-aged children from Nashville, TN and Minneapolis, MN wore triaxial accelerometers. Four distinct MVPA patterns were identified: isolated spurt (IS), isolated sustained activity (ISA), clustered spurt (CS), and clustered sustained activity (CSA)...
February 13, 2018: BMC Public Health
https://www.readbyqxmd.com/read/29434422/validity-of-the-fitbit-one-for-measuring-activity-in-community-dwelling-stroke-survivors
#11
Jonathan Hui, Richard Heyden, Tim Bao, Nicholas Accettone, Catherine McBay, Julie Richardson, Ada Tang
Purpose: We determined the correlation between the Fitbit One and Actical accelerometer for quantifying the 3-day step count and activity levels in community-dwelling individuals with stroke. Method: Twelve participants with a mean age of 62.6 (SD 9.3) years wore both the Fitbit One and the Actical on the non-paretic ankle for 3 days. Regression analyses were performed to examine concurrent validity between the devices for step counts and sedentary, light, moderate, and vigorous activity. The relative error of the Fitbit One compared with the Actical in measuring step count was calculated...
2018: Physiotherapy Canada. Physiothérapie Canada
https://www.readbyqxmd.com/read/29434419/physical-activity-of-icu-survivors-during-acute-admission-agreement-of-the-activpal-with-observation
#12
Claire E Baldwin, Kylie N Johnston, Alex V Rowlands, Marie T Williams
Purpose: We estimated the agreement of a thigh-worn accelerometer, the activPAL, used to measure activity and sedentary parameters, with observed mobility assessments of intensive care unit (ICU) survivors. Method: We prospectively compared activPAL measurements with direct observation during assessments at discharge from the ICU or acute hospital in eight participants with a median age of 56 (1st-3rd quartile 48-65) years and an Acute Physiology and Chronic Health Evaluation II score of 23 (1st-3rd quartile 17-24)...
2018: Physiotherapy Canada. Physiothérapie Canada
https://www.readbyqxmd.com/read/29434193/absolute-marine-gravimetry-with-matter-wave-interferometry
#13
Y Bidel, N Zahzam, C Blanchard, A Bonnin, M Cadoret, A Bresson, D Rouxel, M F Lequentrec-Lalancette
Measuring gravity from an aircraft or a ship is essential in geodesy, geophysics, mineral and hydrocarbon exploration, and navigation. Today, only relative sensors are available for onboard gravimetry. This is a major drawback because of the calibration and drift estimation procedures which lead to important operational constraints. Atom interferometry is a promising technology to obtain onboard absolute gravimeter. But, despite high performances obtained in static condition, no precise measurements were reported in dynamic...
February 12, 2018: Nature Communications
https://www.readbyqxmd.com/read/29433516/a-technical-review-and-evaluation-of-implantable-sensors-for-hearing-devices
#14
REVIEW
Diego Calero, Stephan Paul, André Gesing, Fabio Alves, Júlio A Cordioli
Most commercially available cochlear implants and hearing aids use microphones as sensors for capturing the external sound field. These microphones are in general located in an external element, which is also responsible for processing the sound signal. However, the presence of the external element is the cause of several problems such as discomfort, impossibility of being used during physical activities and sleeping, and social stigma. These limitations have driven studies with the goal of developing totally implantable hearing devices, and the design of an implantable sensor has been one of the main challenges to be overcome...
February 13, 2018: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29432790/neighborhood-built-environment-and-socioeconomic-status-in-relation-to-physical-activity-sedentary-behavior-and-weight-status-of-adolescents
#15
James F Sallis, Terry L Conway, Kelli L Cain, Jordan A Carlson, Lawrence D Frank, Jacqueline Kerr, Karen Glanz, James E Chapman, Brian E Saelens
INTRODUCTION: The study examined the association of neighborhood walkability to multiple activity-related outcomes and BMI among adolescents and evaluated socioeconomic status as an effect modifier. METHOD: Cross-sectional study, with adolescents recruited from neighborhoods that met criteria for a 2 × 2 matrix defined by high/low GIS-defined walkability and high/low median income. Adolescents aged 12-16 years (n = 928) were recruited from selected neighborhoods in Maryland and King County, Washington regions in 2009-2011...
February 9, 2018: Preventive Medicine
https://www.readbyqxmd.com/read/29432610/accelerometer-physical-activity-is-associated-with-greater-gray-matter-volumes-in-older-adults-without-dementia-or-mild-cognitive-impairment
#16
Shannon Halloway, Konstantinos Arfanakis, JoEllen Wilbur, Michael E Schoeny, Susan J Pressler
Objectives: Physical activity (PA) is a modifiable health behavior that can protect against age-related gray matter atrophy and cognitive dysfunction. Current studies of PA and gray matter failed to utilize device measures of PA and do not focus on adults >80 years. Thus, the purpose of this secondary analysis was to examine cross-sectional associations between accelerometer lifestyle PA and (a) gray matter volumes and (b) cognitive function, controlling for demographics and health status...
February 8, 2018: Journals of Gerontology. Series B, Psychological Sciences and Social Sciences
https://www.readbyqxmd.com/read/29431556/the-fit-matters-influence-of-accelerometer-fitting-and-training-drill-demands-on-load-measures-in-rugby-league-players
#17
Blake D McLean, Cloe Cummins, Greta Conlan, Grant Duthie, Aaron J Coutts
PURPOSE: Determine the relationship between drill type and accelerometer-derived loads during various team sport activities, and examine the influence of unit fitting on these loads. METHODS: Sixteen rugby league players were fitted with microtechnology devices in either manufacturer vests or playing jerseys before completing standardised running, agility and tackling drills. Two-dimensional (2D) and three-dimensional (3D) accelerometer loads (BodyLoadTM) per km were compared across drills and fittings (i...
February 12, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29431510/accelerometer-assessed-physical-activity-and-school-absenteeism-due-to-illness-or-injury-among-children-and-adolescents-nhanes-2003-to-2006
#18
Paul D Loprinzi, Emily Frith
INTRODUCTION: To examine the association between objectively measured moderate to vigorous physical activity (MVPA) and total physical activity with school absenteeism due to illness or injury among children and adolescents. DESIGN: Cross-sectional study. SETTING: National Health and Nutrition Examination Survey 2003 to 2006. PARTICIPANTS: A total of 1249 children (aged 6-11 years) and 1747 adolescents (aged 12-17 years)...
March 2018: American Journal of Health Promotion: AJHP
https://www.readbyqxmd.com/read/29431507/high-amounts-of-sitting-low-cardiorespiratory-fitness-and-low-physical-activity-levels-3-key-ingredients-in-the-recipe-for-influencing-metabolic-syndrome-prevalence
#19
Meghan K Edwards, Paul D Loprinzi
PURPOSE: Limited research has evaluated the independent and additive associations of moderate-to-vigorous physical activity (MVPA), sedentary behavior (SB), and cardiorespiratory fitness (CRF) with metabolic syndrome, which was the purpose of this study. DESIGN: Cross-sectional. SETTING: National Health and Nutrition Examination Survey 2003 to 2004. SAMPLE: Three hundred seven adults aged 20 to 49 years. MEASURES: Moderate-to-vigorous physical activity and SB were assessed via accelerometer, whereas CRF was assessed via submaximal treadmill testing...
March 2018: American Journal of Health Promotion: AJHP
https://www.readbyqxmd.com/read/29431128/correlates-of-intensity-specific-physical-activity-in-children-aged-9-11-years-a-multilevel-analysis-of-uk-data-from-the-international-study-of-childhood-obesity-lifestyle-and-the-environment
#20
Hannah J Wilkie, Martyn Standage, Fiona B Gillison, Sean P Cumming, Peter T Katzmarzyk
OBJECTIVES: Physical activity (PA) can provide numerous physical and psychological health gains, yet a low proportion of children in England are sufficiently active to accrue benefit. Analysing the correlates of PA from a socioecological perspective may help to identify factors that promote versus discourage PA. The purpose of the present study was to: (1) assess the relationships between a wide range of potential correlates and intensity-specific PA and (2) explore which correlates are associated with meeting government PA guidelines...
February 3, 2018: BMJ Open
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