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Validation of accelerometers

Kristofer Gladh, Riccardo Lo Martire, Björn O Äng, Peter Lindholm, Jenny Nilsson, Anton Westman
INTRODUCTION: High prevalence of neck pain among skydivers is related to parachute opening shock (POS) exposure, but few investigations of POS deceleration have been made. Existing data incorporate equipment movements, limiting its representability of skydiver deceleration. This study aims to describe POS decelerations and compare human- with equipment-attached data. METHODS: Wearing two triaxial accelerometers placed on the skydiver (neck-sensor) and equipment (rig-sensor), 20 participants made 2 skydives each...
February 1, 2017: Aerospace Medicine and Human Performance
Kristi Elisabeth Heiberg, Vigdis Bruun-Olsen, Astrid Bergland
BACKGROUND: The survivors after hip fracture often report severe pain and loss of physical functioning. The poor outcomes cause negative impact on the person's physical functioning and quality of life and put a financial burden on society. Rehabilitation is important to improve physical functioning after hip fracture. To maintain the continuity in rehabilitation we have an assumption that it is of utmost importance to continue and progress the functional training that already started at the hospital, while the patients are transferred to short-term stays in a nursing home before they are returning to home...
January 17, 2017: BMC Geriatrics
Andrew M Murray, Joong Hyun Ryu, John Sproule, Anthony P Turner, Phil Graham-Smith, Marco Cardinale
PURPOSE: Running performance is influenced by the interaction of biomechanical and physiological factors. Miniaturised accelerometers worn by the athlete can be used to quantify mechanical aspects of running and be used as a non-invasive tool to assess training status and progression. The aim of this study was to define and validate a method to assess running regularity and allow the estimation of an individual's V̇O2 and/or blood lactate [La]b based on data collected with accelerometers and heart rate (HR)...
January 17, 2017: International Journal of Sports Physiology and Performance
Nidhi Gupta, Caroline Stordal Christiansen, Christiana Hanisch, Hans Bay, Hermann Burr, Andreas Holtermann
OBJECTIVES: To investigate the differences between a questionnaire-based and accelerometer-based sitting time, and develop a model for improving the accuracy of questionnaire-based sitting time for predicting accelerometer-based sitting time. METHODS: 183 workers in a cross-sectional study reported sitting time per day using a single question during the measurement period, and wore 2 Actigraph GT3X+ accelerometers on the thigh and trunk for 1-4 working days to determine their actual sitting time per day using the validated Acti4 software...
January 16, 2017: BMJ Open
Saskia Koene, Ilse Dirks, Esmee van Mierlo, Pascal R de Vries, Anjo J W M Janssen, Jan A M Smeitink, Arjen Bergsma, Hans Essers, Kenneth Meijer, Imelda J M de Groot
Feasible, sensitive and clinically relevant outcome measures are of extreme importance when designing clinical trials. For paediatric mitochondrial disease, no robust end point has been described to date. The aim of this study was to select the domains of daily physical activity, which can be measured by 3D accelerometry, that could serve as sensitive end points in future clinical trials in children with mitochondrial disorders.In this exploratory observational study, 17 patients with mitochondrial disease and 16 age- and sex-matched controls wore 3D accelerometers at the upper leg, upper arm, lower arm and chest during one weekend...
January 17, 2017: JIMD Reports
R Izquierdo-Gomez, D Martinez-Gómez, I Esteban-Cornejo, P C Hallal, L García-Cervantes, A Villagra, O L Veiga
BACKGROUND: It is a priority to understand that physical activity behaviour over time is a priority in Down syndrome population in order to design and promote succesfull interventions to maintain or increase levels of physical activity. We aimed to study 1 and 2-year changes in objectively measured physical activity among a relatively large sample of adolescents with Down syndrome. METHODS: This study comprised a total of 99 adolescents with Down syndrome (38 girls) aged from 11 to 20 years old at baseline...
January 16, 2017: Journal of Intellectual Disability Research: JIDR
B O'Neill, S M McDonough, J J Wilson, I Bradbury, K Hayes, A Kirk, L Kent, D Cosgrove, J M Bradley, M A Tully
BACKGROUND: There are challenges for researchers and clinicians to select the most appropriate physical activity tool, and a balance between precision and feasibility is needed. Currently it is unclear which physical activity tool should be used to assess physical activity in Bronchiectasis. The aim of this research is to compare assessment methods (pedometer and IPAQ) to our criterion method (ActiGraph) for the measurement of physical activity dimensions in Bronchiectasis (BE), and to assess their feasibility and acceptability...
January 14, 2017: Respiratory Research
Masha Kocherginsky, Megan Huisingh-Scheetz, William Dale, Diane S Lauderdale, Linda Waite
INTRODUCTION: Accelerometers are increasingly used in research. Four to 7 days of monitoring is preferred to estimate average activity but may be burdensome for older adults. We aimed to investigate: 1) 7-day accelerometry protocol adherence, 2) demographic predictors of adherence, 3) day of the week effect, and 4) average activity calculated from 7 versus fewer days among older adults. METHODS: We used the 2003-2006 older adult hip accelerometry data from the National Health and Nutrition Examination Survey (NHANES) sample...
2017: PloS One
Craig A Melville, Alyt Oppewal, Liselotte Schäfer Elinder, Ellen Freiberger, Myriam Guerra-Balic, Thessa I M Hilgenkamp, Ingi Einarsson, Rocio Izquierdo-Gómez, Oriol Sansano-Nadal, Pauli Rintala, Antonio Cuesta-Vargas, Maria Giné-Garriga
Supporting positive change in lifestyle behaviours is a priority in tackling the health inequalities experienced by adults with intellectual disabilities. In this systematic review, we examine the evidence on the definition, measurement and epidemiology of sedentary behaviour of adults with intellectual disabilities. A systematic literature search of PUBMED, EMBASE, MEDLINE and Google Scholar was performed to identify studies published from 1990 up to October 2015. Nineteen papers met the criteria for inclusion in the systematic review...
January 2, 2017: Preventive Medicine
Henrik Riel, Camilla Rams Rathleff, Pernille Møller Kalstrup, Niels Kragh Madsen, Elena Selmar Pedersen, Louise Bilenberg Pape-Haugaard, Morten Villumsen
INTRODUCTION: Walking is endorsed as health enhancing and is the most common type of physical activity among older adults. Accelerometers are superior to self-reports when measuring steps, however, if they are to be used by clinicians the validity is of great importance. The aim of this study was to investigate the criterion validity of Mother and ActiGraph wGT3X-BT in measuring steps by comparing the devices to a hand tally under controlled conditions in healthy participants. METHODS: Thirty healthy participants were fitted with a belt containing the sensor of Mother (Motion Cookie) and ActiGraph...
2016: PeerJ
Katelyn Cahill-Rowley, Jessica Rose
Reaching is a well-practiced functional task crucial to daily living activities, and temporal-spatial measures of reaching reflect function for both adult and pediatric populations with upper-extremity motor impairments. Inertial sensors offer a mobile and inexpensive tool for clinical assessment of movement. This research outlines a method for measuring temporal-spatial reach parameters using inertial sensors, and validates these measures with traditional marker-based motion capture. 140 reaches from 10 adults, and 30 reaches from nine children aged 18-20 months, were recorded and analyzed using both inertial-sensor and motion-capture methods...
October 26, 2016: Journal of Biomechanics
David R Bassett, Lindsay P Toth, Samuel R LaMunion, Scott E Crouter
Step counting has long been used as a method of measuring distance. Starting in the mid-1900s, researchers became interested in using steps per day to quantify ambulatory physical activity. This line of research gained momentum after 1995, with the introduction of reasonably accurate spring-levered pedometers with digital displays. Since 2010, the use of accelerometer-based "activity trackers" by private citizens has skyrocketed. Steps have several advantages as a metric for assessing physical activity: they are intuitive, easy to measure, objective, and they represent a fundamental unit of human ambulatory activity...
December 22, 2016: Sports Medicine
Monique A Ladds, Adam P Thompson, David J Slip, David P Hocking, Robert G Harcourt
Constructing activity budgets for marine animals when they are at sea and cannot be directly observed is challenging, but recent advances in bio-logging technology offer solutions to this problem. Accelerometers can potentially identify a wide range of behaviours for animals based on unique patterns of acceleration. However, when analysing data derived from accelerometers, there are many statistical techniques available which when applied to different data sets produce different classification accuracies. We investigated a selection of supervised machine learning methods for interpreting behavioural data from captive otariids (fur seals and sea lions)...
2016: PloS One
Lieven Billiet, Thijs Willem Swinnen, Rene Westhovens, Kurt de Vlam, Sabine Van Huffel
One of the important aspects to be considered in rheumatic and musculoskeletal diseases is the patient's activity capacity (or performance), defined as the ability to perform a task. Currently, it is assessed by physicians or health professionals mainly by means of a patient-reported questionnaire, sometimes combined with the therapist's judgment on performance-based tasks. This work introduces an approach to assess the activity capacity at home in a more objective, yet interpretable way. It offers a pilot study on 28 patients suffering from axial spondyloarthritis (axSpA) to demonstrate its efficacy...
December 16, 2016: Sensors
Asher Tal, Zvika Shinar, David Shaki, Shlomi Codish, Aviv Goldbart
STUDY OBJECTIVES: To validate a contact-free system designed to achieve maximal comfort during long-term sleep monitoring, together with high monitoring accuracy. METHODS: We used a contact-free monitoring system (EarlySense, Ltd., Israel), comprising an under-the-mattress piezoelectric sensor and a smartphone application, to collect vital signs and analyze sleep. Heart rate (HR), respiratory rate (RR), body movement, and calculated sleep-related parameters from the EarlySense (ES) sensor were compared to data simultaneously generated by the gold standard, polysomnography (PSG)...
December 16, 2016: Journal of Clinical Sleep Medicine: JCSM: Official Publication of the American Academy of Sleep Medicine
Carlos Pérez-López, Albert Samà, Daniel Rodríguez-Martín, Andreu Català, Joan Cabestany, Juan Manuel Moreno-Arostegui, Eva de Mingo, Alejandro Rodríguez-Molinero
Altered movement control is typically the first noticeable symptom manifested by Parkinson's disease (PD) patients. Once under treatment, the effect of the medication is very patent and patients often recover correct movement control over several hours. Nonetheless, as the disease advances, patients present motor complications. Obtaining precise information on the long-term evolution of these motor complications and their short-term fluctuations is crucial to provide optimal therapy to PD patients and to properly measure the outcome of clinical trials...
December 15, 2016: Sensors
Ashesh Shah, Jérôme Coste, Jean-Jacques Lemaire, Erik Schkommodau, Ethan Taub, Raphael Guzman, Philippe Derost, Simone Hemm
OBJECTIVE Despite the widespread use of deep brain stimulation (DBS) for movement disorders such as Parkinson's disease (PD), the exact anatomical target responsible for the therapeutic effect is still a subject of research. Intraoperative stimulation tests by experts consist of performing passive movements of the patient's arm or wrist while the amplitude of the stimulation current is increased. At each position, the amplitude that best alleviates rigidity is identified. Intrarater and interrater variations due to the subjective and semiquantitative nature of such evaluations have been reported...
December 16, 2016: Journal of Neurosurgery
Christian López-Rodríguez, Maria Laguna, Alba Gómez-Cabello, Narcis Gusi, Luis Espino, Gerardo Villa, R Pedrero-Chamizo, J A Casajus, Ignacio Ara, Susana Aznar
This study aims to examine the validity and reliability of the Elderly EXERNET Physical Activity Questionnaire (EEPAQ) in a sample of Spanish elderly population. A sample of 73 elderly successfully completed the EEPAQ and wore an accelerometer over 7 consecutive days. Test-retest reliability of the EEPAQ was assessed by having the participants answer the EEPAQ twice within 14 days. Criterion validity was assessed for the questionnaire against the accelerometer, as the gold standard. Results indicated that EEPAQ had adequate reliability measured by Intraclass correlation coefficient (ICC) (walking ICC=0...
March 2017: Archives of Gerontology and Geriatrics
Gill Hubbard, Ronan O'Carroll, Julie Munro, Nanette Mutrie, Sally Haw, Helen Mason, Shaun Treweek
BACKGROUND: Pilot and feasibility work is conducted to evaluate the operational feasibility and acceptability of the intervention itself and the feasibility and acceptability of a trials' protocol design. The Cardiac Rehabilitation In Bowel cancer (CRIB) study was a pilot randomised controlled trial (RCT) of cardiac rehabilitation versus usual care (no rehabilitation) for post-surgical colorectal cancer patients. A key aim of the pilot trial was to test the feasibility and acceptability of the protocol design...
2016: Pilot and Feasibility Studies
Sally E Barber, Cath Jackson, Catherine Hewitt, Hannah R Ainsworth, Hannah Buckley, Shaheen Akhtar, Daniel D Bingham, Ash C Routen, Carolyn Summerbell, Gerry Richardson, Helen J Moore, Kate E Pickett, Claire O'Malley, Shirley Brierley, John Wright
BACKGROUND: Few evidence-based physical activity interventions for pre-school children are available. This two-armed pilot cluster randomised controlled trial aimed to evaluate the feasibility of conducting a full-scale trial and of delivering an outdoor physical activity intervention for pre-school children. METHODS: School was the unit of randomisation, and follow-up occurred at 10 and 52 weeks. Trial feasibility was assessed by recruitment, retention and completion rates of primary (daily moderate-to-vigorous physical activity (MVPA)) and secondary (anthropometric, quality of life, self-efficacy) outcomes...
2016: Pilot and Feasibility Studies
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