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Validation of accelerometers

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https://www.readbyqxmd.com/read/29332671/estimating-sleep-efficiency-in-10-to-13-year-olds-using-a-waist-worn-accelerometer
#1
M M Borghese, Y Lin, J P Chaput, I Janssen
OBJECTIVE: In field settings, wrist- and waist-worn accelerometers are typically used to assess sleep characteristics and movement behaviors, respectively. There has been a shift in movement behavior studies to wear accelerometers 24 h/d. Sleep characteristics could be assessed in these studies if sleep algorithms were available for waist-worn accelerometers. The objective of this study was to develop and provide validity data for an algorithm/sleep likelihood score cut-off to estimate sleep efficiency in children using the waist-worn Actical accelerometer...
February 2018: Sleep Health
https://www.readbyqxmd.com/read/29325578/effects-of-a-peer-led-walking-in-schools-intervention-the-wish-study-on-physical-activity-levels-of-adolescent-girls-a-cluster-randomised-pilot-study
#2
Angela Carlin, Marie H Murphy, Alan Nevill, Alison M Gallagher
BACKGROUND: School-based interventions may be effective at increasing levels of physical activity (PA) among adolescents; however, there is a paucity of evidence on whether walking can be successfully promoted to increase PA in this age group. This pilot study aimed to assess the effects of a 12-week school-based peer-led brisk walking programme on levels of school-time PA post intervention. METHODS: Female participants, aged 11-13 years, were recruited from six post-primary schools in Northern Ireland...
January 11, 2018: Trials
https://www.readbyqxmd.com/read/29324298/calibration-of-raw-accelerometer-data-to-measure-physical-activity-a-systematic-review
#3
REVIEW
Márcio de Almeida Mendes, Inácio C M da Silva, Virgílio V Ramires, Felipe F Reichert, Rafaela C Martins, Elaine Tomasi
Most of calibration studies based on accelerometry were developed using count-based analyses. In contrast, calibration studies based on raw acceleration signals are relatively recent and their evidences are incipient. The aim of the current study was to systematically review the literature in order to summarize methodological characteristics and results from raw data calibration studies. The review was conducted up to May 2017 using four databases: PubMed, Scopus, SPORTDiscus and Web of Science. Methodological quality of the included studies was evaluated using the Landis and Koch's guidelines...
December 30, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29304030/fast-alignment-of-sins-for-marching-vehicles-based-on-multi-vectors-of-velocity-aided-by-gps-and-odometer
#4
Chunxi Zhang, Longjun Ran, Lailiang Song
In the strap-down inertial navigation system (SINS), the initial attitude matrix is acquired through alignment. Though there were multiple valid methods, alignment time and accuracy are still core issues, especially regarding the condition of the motion carrier. Inspired by the idea of constructing nonlinear vectors by velocity in a different coordinate frame, this paper proposes an innovative alignment method for a vehicle-mounted SINS in motion. In this method, the core issue of acquiring the attitude matrix is to calculate the matrix between the inertial frame and the initial body frame, which can be constructed through the nonlinear velocity vectors' information from the GPS and the odometer at different moments, which denominate the multi-vector attitude determination...
January 5, 2018: Sensors
https://www.readbyqxmd.com/read/29300701/speech2health-a-mobile-framework-for-monitoring-dietary-composition-from-spoken-data
#5
Niloofar Hezarjaribi, Sepideh Mazrouee, Hassan Ghasemzadeh
Diet and physical activity are known as important lifestyle factors in self-management and prevention of many chronic diseases. Mobile sensors such as accelerometers have been used to measure physical activity or detect eating time. In many intervention studies, however, stringent monitoring of overall dietary composition and energy intake is needed. Currently, such a monitoring relies on self-reported data by either entering text or taking an image that represents food intake. These approaches suffer from limitations such as low adherence in technology adoption and time sensitivity to the diet intake context...
January 2018: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/29290448/technical-note-validation-of-an-ear-tag-accelerometer-sensor-to-determine-rumination-eating-and-activity-behaviors-of-grazing-dairy-cattle
#6
G M Pereira, B J Heins, M I Endres
The objective of this study was to validate an ear-tag accelerometer sensor (CowManager SensOor, Agis Automatisering BV, Harmelen, the Netherlands) using direct visual observations in a grazing dairy herd. Lactating crossbred cows (n = 24) were used for this experiment at the University of Minnesota West Central Research and Outreach Center grazing dairy (Morris, MN) during the summer of 2016. A single trained observer recorded behavior every minute for 6 h for each cow (24 cows × 6 h = 144 h of observation total)...
December 28, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29288436/the-relationships-between-internal-and-external-measures-of-training-load-and-intensity-in-team-sports-a-meta-analysis
#7
REVIEW
Shaun J McLaren, Tom W Macpherson, Aaron J Coutts, Christopher Hurst, Iain R Spears, Matthew Weston
BACKGROUND: The associations between internal and external measures of training load and intensity are important in understanding the training process and the validity of specific internal measures. OBJECTIVES: We aimed to provide meta-analytic estimates of the relationships, as determined by a correlation coefficient, between internal and external measures of load and intensity during team-sport training and competition. A further aim was to examine the moderating effects of training mode on these relationships...
December 29, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29284544/comprehensive-measurement-of-stroke-gait-characteristics-with-a-single-accelerometer-in-the-laboratory-and-community-a-feasibility-validity-and-reliability-study
#8
Sarah A Moore, Aodhan Hickey, Sue Lord, Silvia Del Din, Alan Godfrey, Lynn Rochester
BACKGROUND: Application of objective measurement of stroke gait with accelerometer-based wearable technology and associated algorithms is increasing, despite reports questioning the accuracy of this technique in quantifying specific stroke-related gait impairments. The aim of this study is to determine the feasibility, validity and reliability of a low-cost open-source system incorporating algorithms and a single tri-axial accelerometer-based wearable to quantify gait characteristics in the laboratory and community post-stroke...
December 29, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/29283421/automatic-classification-of-sub-techniques-in-classical-cross-country-skiing-using-a-machine-learning-algorithm-on-micro-sensor-data
#9
Ole Marius Hoel Rindal, Trine M Seeberg, Johannes Tjønnås, Pål Haugnes, Øyvind Sandbakk
The automatic classification of sub-techniques in classical cross-country skiing provides unique possibilities for analyzing the biomechanical aspects of outdoor skiing. This is currently possible due to the miniaturization and flexibility of wearable inertial measurement units (IMUs) that allow researchers to bring the laboratory to the field. In this study, we aimed to optimize the accuracy of the automatic classification of classical cross-country skiing sub-techniques by using two IMUs attached to the skier's arm and chest together with a machine learning algorithm...
December 28, 2017: Sensors
https://www.readbyqxmd.com/read/29273954/late-breast-cancer-treatment-related-symptoms-and-functioning-associations-with-physical-activity-adoption-and-maintenance-during-a-lifestyle-intervention-for-rural-survivors
#10
Tera L Fazzino, Jennifer Klemp, Christie Befort
PURPOSE: Physical activity may be difficult for survivors with poorer functioning following primary treatment. The study examined whether late symptoms of breast cancer treatment impact PA adoption (0-6 months) and maintenance (6-18 months) during a weight management intervention, and whether late symptoms influence PA when accounting for overall functioning. METHODS: Secondary analyses were conducted using a sample of survivors participating in a weight management intervention and who provided valid weight and accelerometer data at baseline and 6 months (N = 176)...
December 22, 2017: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/29258977/estimation-of-symptom-severity-during-chemotherapy-from-passively-sensed-data-exploratory-study
#11
Carissa A Low, Anind K Dey, Denzil Ferreira, Thomas Kamarck, Weijing Sun, Sangwon Bae, Afsaneh Doryab
BACKGROUND: Physical and psychological symptoms are common during chemotherapy in cancer patients, and real-time monitoring of these symptoms can improve patient outcomes. Sensors embedded in mobile phones and wearable activity trackers could be potentially useful in monitoring symptoms passively, with minimal patient burden. OBJECTIVE: The aim of this study was to explore whether passively sensed mobile phone and Fitbit data could be used to estimate daily symptom burden during chemotherapy...
December 19, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/29258274/condition-assessment-of-foundation-piles-and-utility-poles-based-on-guided-wave-propagation-using-a-network-of-tactile-transducers-and-support-vector-machines
#12
Ulrike Dackermann, Yang Yu, Ernst Niederleithinger, Jianchun Li, Herbert Wiggenhauser
This paper presents a novel non-destructive testing and health monitoring system using a network of tactile transducers and accelerometers for the condition assessment and damage classification of foundation piles and utility poles. While in traditional pile integrity testing an impact hammer with broadband frequency excitation is typically used, the proposed testing system utilizes an innovative excitation system based on a network of tactile transducers to induce controlled narrow-band frequency stress waves...
December 18, 2017: Sensors
https://www.readbyqxmd.com/read/29249686/reliability-and-validity-of-self-reported-sitting-and-breaks-from-sitting-in-the-workplace
#13
Bronwyn Sudholz, Nicola D Ridgers, Alexander Mussap, Jason Bennie, Anna Timperio, Jo Salmon
OBJECTIVES: Prolonged sitting is a health risk factor which is ubiquitous to the workplace, and breaking up prolonged sitting is widely recommended. This study evaluated the test-retest reliability and concurrent validity of a self-report measure of duration of sitting and breaks from sitting in the workplace. DESIGN: Cross-sectional study. METHODS: Fifty-nine workers who reported spending most of their work time sitting wore an activPAL inclinometer and the ActiGraph accelerometer for eight consecutive days, and completed single-item measures of duration of sitting (min/work hour) and breaks from sitting (frequency/per work hour), twice, seven days apart...
November 7, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29242818/exploring-accelerometer-versus-self-report-sleep-assessment-in-youth-with-concussion
#14
Ivona Berger, Joyce Obeid, Brian W Timmons, Carol DeMatteo
This study examines accelerometer-based and self-report assessment of sleep disturbance from a larger prospective cohort of youth 5 to 18 years of age with postconcussive injury. Twenty-one participants with self-reported sleep disturbance were evaluated using accelerometers. Participants completed the Pittsburgh Sleep Quality Index (PSQI) every 48 hours and also measured sleep via accelerometry. Correlations were conducted matching PSQI scores to accelerometry assessment. PSQI scores were significantly correlated only with "average number of awakenings" (r = -0...
2017: Global Pediatric Health
https://www.readbyqxmd.com/read/29237580/detecting-smoking-events-using-accelerometer-data-collected-via-smartwatch-technology-validation-study
#15
Casey A Cole, Dien Anshari, Victoria Lambert, James F Thrasher, Homayoun Valafar
BACKGROUND: Smoking is the leading cause of preventable death in the world today. Ecological research on smoking in context currently relies on self-reported smoking behavior. Emerging smartwatch technology may more objectively measure smoking behavior by automatically detecting smoking sessions using robust machine learning models. OBJECTIVE: This study aimed to examine the feasibility of detecting smoking behavior using smartwatches. The second aim of this study was to compare the success of observing smoking behavior with smartwatches to that of conventional self-reporting...
December 13, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/29230643/measuring-fear-of-physical-activity-in-patients-with-heart-failure
#16
Jeremia M Hoffmann, Susan Hellwig, Vincent M Brandenburg, Heike Spaderna
PURPOSE: Fear of physical activity (FoPA) has been suggested as a psychological barrier to exercise-based cardiac rehabilitation and everyday physical activity (PA) in patients with heart failure (HF). We evaluated the recently developed Fear of Activity in Situations-Heart Failure (FActS-HF) questionnaire that assesses affective/cognitive fear reactions to situations of varying PA intensities. METHODS: The FActS-HF was given to 132 ambulatory patients with stable HF (67 ± 12 years, 80% men)...
December 11, 2017: International Journal of Behavioral Medicine
https://www.readbyqxmd.com/read/29228941/four-years-follow-up-changes-of-physical-activity-and-sedentary-time-in-women-undergoing-roux-en-y-gastric-bypass-surgery-and-appurtenant-children
#17
Fanny Sellberg, Mikaela Willmer, Per Tynelius, Daniel Berglind
BACKGROUND: Objectively measured levels of physical activity (PA) in patients undergoing Roux-en-Y Gastric Bypass (RYGB) surgery remain essentially unchanged from before to one year after surgery. Effects from RYGB on objectively measured levels of PA among women undergoing RYGB and appurtenant children beyond one year post-surgery are unknown. The aim of the present study was to objectively assess longitudinal changes in PA and sedentary time (ST), among women undergoing RYGB and appurtenant children, from three months before to nine and 48 months after maternal surgery...
December 11, 2017: BMC Surgery
https://www.readbyqxmd.com/read/29226867/an-objective-method-to-accurately-measure-cardiorespiratory-fitness-in-older-adults-who-cannot-satisfy-widely-used-oxygen-consumption-criteria
#18
Ryan J Dougherty, Jacob B Lindheimer, Aaron J Stegner, Stephanie Van Riper, Ozioma C Okonkwo, Dane B Cook
Cardiorespiratory fitness (CRF) is routinely investigated in older adults; however, the most appropriate CRF measure to use for this population has received inadequate attention. This study aimed to 1) evaluate the reliability and validity of the oxygen uptake efficiency slope (OUES) as a sub-maximal measurement of CRF; 2) examine demographic, risk-factor, and exercise testing differences in older adults who satisfied standardized criteria for a peak oxygen consumption (V̇O2peak) test compared to those who did not; and 3) determine the difference between directly measured V̇O2peak values and OUES-predicted V̇O2peak values...
December 6, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29212552/validity-and-reliability-of-simple-measurement-device-to-assess-the-velocity-of-the-barbell-during-squats
#19
Silvio Lorenzetti, Thomas Lamparter, Fabian Lüthy
OBJECTIVES: The velocity of a barbell can provide important insights on the performance of athletes during strength training. The aim of this work was to assess the validity and reliably of four simple measurement devices that were compared to 3D motion capture measurements during squatting. Nine participants were assessed when performing 2 × 5 traditional squats with a weight of 70% of the 1 repetition maximum and ballistic squats with a weight of 25 kg. Simultaneously, data was recorded from three linear position transducers (T-FORCE, Tendo Power and GymAware), an accelerometer based system (Myotest) and a 3D motion capture system (Vicon) as the Gold Standard...
December 6, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/29194358/automated-ecological-assessment-of-physical-activity-advancing-direct-observation
#20
Jordan A Carlson, Bo Liu, James F Sallis, Jacqueline Kerr, J Aaron Hipp, Vincent S Staggs, Amy Papa, Kelsey Dean, Nuno M Vasconcelos
Technological advances provide opportunities for automating direct observations of physical activity, which allow for continuous monitoring and feedback. This pilot study evaluated the initial validity of computer vision algorithms for ecological assessment of physical activity. The sample comprised 6630 seconds per camera (three cameras in total) of video capturing up to nine participants engaged in sitting, standing, walking, and jogging in an open outdoor space while wearing accelerometers. Computer vision algorithms were developed to assess the number and proportion of people in sedentary, light, moderate, and vigorous activity, and group-based metabolic equivalents of tasks (MET)-minutes...
December 1, 2017: International Journal of Environmental Research and Public Health
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