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Validation of accelerometers

Henri Vähä-Ypyä, Pauliina Husu, Jaana Suni, Tommi Vasankari, Harri Sievänen
Hip-worn accelerometers are widely used to estimate physical activity (PA), but the accuracy of acceleration-threshold based analysis is compromised when it comes to identifying stationary and sedentary behaviors, let alone classifying body postures into lying, sitting or standing. The purpose of this study was to devise a novel method for accurate classification of body posture using triaxial data from hip-worn accelerometer and to evaluate its performance in free-living conditions against a thigh-worn accelerometer...
November 16, 2017: Scandinavian Journal of Medicine & Science in Sports
Christopher Kuenze, Lisa Cadmus-Bertram, Karin Pfieffer, Stephanie Trigsted, Dane Cook, Caroline Lisee, David Bell
CONTEXT: Reductions in objectively measured moderate-to-vigorous physical activity (MVPA) have been reported among individuals with ACLR. Self-reported measures of physical activity are commonly utilized to assess participation in physical activity after ACLR despite the lack of evidence to support the validity of such measures within this population. OBJECTIVE: The objective of this research was to determine the relationships between objectively measured MVPA, self-reported physical activity, and knee function among individuals with ACLR...
November 15, 2017: Journal of Sport Rehabilitation
Paul R Hibbing, Laura D Ellingson, Philip M Dixon, Gregory J Welk
The challenges of using physical activity data from accelerometers have been compounded with the recent focus on wrist-worn monitors and raw acceleration (as opposed to activity counts). PURPOSE: This study developed and systematically evaluated a suite of new accelerometer processing models for youth. METHODS: Four adaptations of the Sojourn method were developed using data from a laboratory-based experiment in which youth (N = 54) performed structured activity routines...
November 10, 2017: Medicine and Science in Sports and Exercise
Verónica Cabanas-Sánchez, David Martínez-Gómez, Irene Esteban-Cornejo, José Castro-Piñero, Julio Conde-Caveda, Óscar L Veiga
OBJECTIVES: To develop a questionnaire able to assess time spent by youth in a wide range of leisure-time sedentary behaviors (SB) and evaluate its test-retest reliability and criterion validity. DESIGN: Cross-sectional observational. METHODS: The reliability sample included 194 youth, aged 10-18 years, who completed the questionnaire twice, separated by one-week interval. The validity study comprised 1207 participants aged 8-18 years. Participants wore an accelerometer for 7 consecutive days...
November 7, 2017: Journal of Science and Medicine in Sport
Jeffer Eidi Sasaki, Jairo Hélio Júnior, Joilson Meneguci, Sheilla Tribess, Moacir Marocolo Júnior, Antonio Stabelini Neto, Jair Sindra Virtuoso Júnior
The purpose of the study was to examine the minimum number of monitoring days for reliably estimating physical activity (PA) and sedentary behaviour (SB) from accelerometer data in older adults. Forty-two older adults from a local senior centre participated in this study. Participants wore an ActiGraph wGT3X-BT on the right hip for 7 consecutive days. Accelerometer data were downloaded to a computer and converted to activity count data in 60s epochs. Time spent in SB and different PA intensity categories were estimated with commonly used activity count cut-points...
November 10, 2017: Journal of Sports Sciences
Corina Berli, Niall Bolger, Patrick E Shrout, Gertraud Stadler, Urte Scholz
Little is known about how couples' social support facilitates the pursuit of important goals in daily life. Using an interpersonal perspective, we examined the effects of support provision and receipt on same-day physical activity, and studied the role of partners' joint engagement in activities. One hundred nineteen heterosexual couples reported on target persons' received and partners' provided support across 28 diary days, yielding 2,854 valid days. A dyadic report on couples' joint engagement was obtained from a subset of 88 couples...
November 1, 2017: Personality & Social Psychology Bulletin
Shweta Gore, Jennifer Blackwood, Mary Guyette, Bara Alsalaheen
PURPOSE: Reduced physical activity is associated with poor prognosis in chronic obstructive pulmonary disease (COPD). Accelerometers have greatly improved quantification of physical activity by providing information on step counts, body positions, energy expenditure, and magnitude of force. The purpose of this systematic review was to compare the validity and reliability of accelerometers used in patients with COPD. METHODS: An electronic database search of MEDLINE and CINAHL was performed...
November 8, 2017: Journal of Cardiopulmonary Rehabilitation and Prevention
C Westgarth, C Ladha
BACKGROUND: The ability to make objective measurements of physical activity in dogs has both clinical and research applications. Accelerometers offer a non-intrusive and convenient solution. Of the commercialy available sensors, measurements are commonly given in manufacturer bespoke units and calculated with closed source approaches. Furthermore, the validation studies that exist for such devices are mounting location dependant, not transferable between brands or not suitable for handling modern raw accelerometry type data...
November 7, 2017: BMC Veterinary Research
Conor Lambert, Belinda R Beck, Benjamin K Weeks
Lambert, C, Beck, BR, and Weeks, BK. Concurrent validity and reliability of a linear positional transducer and an accelerometer to measure punch characteristics. J Strength Cond Res XX(X): 000-000, 2017-Punch speed is an important factor in the sport of boxing, and its measurement has important implications for monitoring training progression and outcomes. The aim of the current study was to establish the concurrent validity and reliability of a linear position transducer and an accelerometer for the quantification of punch characteristics in untrained adults...
November 1, 2017: Journal of Strength and Conditioning Research
Jamie Tallent, Matthew Higgins, Nick Parker, Mark Waldron, Eoin Bradford, James Keenan, Barry V O'Neill
BACKGROUND: Bowling overs are the primary recorded measure for workloads in cricket for youth through to professionals. However, the validity of this measure has never been tested. Additionally, despite the cognitive component of cricket being suggested to be very high, changes in psychomotor processing speed has again not been explored. METHODS: Eight professional English county cricket bowlers participated in the study. Participants wore global positioning systems with a tri-axial accelerometer during a Twenty20 match and training...
November 7, 2017: Journal of Sports Medicine and Physical Fitness
P-Y de Müllenheim, S Chaudru, M Emily, M Gernigon, G Mahé, S Bickert, J Prioux, B Noury-Desvaux, A Le Faucheur
OBJECTIVES: To determine the best method and combination of methods among global positioning system (GPS), accelerometry, and heart rate (HR) for estimating energy expenditure (EE) during level and graded outdoor walking. DESIGN: Thirty adults completed 6-min outdoor walks at speeds of 2.0, 3.5, and 5.0kmh(-1) during three randomized outdoor walking sessions: one level walking session and two graded (uphill and downhill) walking sessions on a 3.4% and a 10.4% grade...
October 13, 2017: Journal of Science and Medicine in Sport
Maia P Smith, Marie Standl, Joachim Heinrich, Holger Schulz
BACKGROUND: Because of unreliable self-report, accelerometry is increasingly used to objectively monitor physical activity (PA). However, results of accelerometric studies vary depending on the chosen cutpoints between activity intensities. Population-specific activity patterns likely affect the size of these differences. To establish their size and stability we apply three sets of cutpoints, including two calibrated to a single reference, to our accelerometric data and compare PA estimates...
2017: PloS One
Enrica Papi, Woon Senn Koh, Alison H McGregor
Continuous monitoring of spine movement function could enhance our understanding of low back pain development. Wearable technologies have gained popularity as promising alternative to laboratory systems in allowing ambulatory movement analysis. This paper aims to review the state of art of current use of wearable technology to assess spine kinematics and kinetics. Four electronic databases and reference lists of relevant articles were searched to find studies employing wearable technologies to assess the spine in adults performing dynamic movements...
October 7, 2017: Journal of Biomechanics
Kaori Ishii, Ai Shibata, Satoshi Kurita, Shohei Yano, Shigeru Inoue, Takemi Sugiyama, Neville Owen, Koichiro Oka
BACKGROUND: Good quality measures of Japanese adults' sedentary behaviors are needed to accurately assess correlates of specific sedentary behaviors. The present study assessed criterion validity of total sedentary behavior and test-retest reliability of six domain-specific sedentary behaviors. METHODS: We administered a questionnaire, based on previous studies, that measured domain-specific sedentary behaviors. To examine validity, agreement between self-reported time spent in sedentary behaviors from the questionnaire and objectively-measured sedentary time using accelerometers was compared among 392 adults (aged 40-64 years) in two Japanese cities...
October 28, 2017: Journal of Epidemiology
Catherine A Sharp, Kelly A Mackintosh, Mihela Erjavec, Duncan M Pascoe, Pauline J Horne
OBJECTIVES: Validation of physical activity measurement tools is essential to determine the relationship between physical activity and health in preschool children, but research to date has not focused on this priority. The aims of this study were to ascertain inter-rater reliability of observer step count, and interdevice reliability and validity of Fitbit Zip accelerometer step counts in preschool children. METHODS: Fifty-six children aged 3-4 years (29 girls) recruited from 10 nurseries in North Wales, UK, wore two Fitbit Zip accelerometers while performing a timed walking task in their childcare settings...
2017: BMJ Open Sport & Exercise Medicine
E S L Pedersen, L H Mortensen, S Brage, A L Bjerregaard, M Aadahl
BACKGROUND: The Physical Activity Scale (PAS2) was developed to measure physical activity (PA) during work, transportation and leisure time, in the Danish adult population. The objective of this study was to assess the criterion validity of PAS2 against a combined accelerometer and heart rate monitor in Danish adults and to investigate if the criterion validity differed by socio-demographic factors and body mass index. METHOD: A total of 330 Danish adults (mean age = 46...
October 1, 2017: Scandinavian Journal of Public Health
Kurt H Schütte, Stefan Seerden, Rachel Venter, Benedicte Vanwanseele
Medial tibial stress syndrome (MTSS) is a common overuse running injury with pathomechanics likely to be exaggerated by fatigue. Wearable accelerometry provides a novel alternative to assess biomechanical parameters continuously while running in more ecologically valid settings. The purpose of this study was to determine the influence of outdoor running fatigue and MTSS on both dynamic loading and dynamic stability derived from trunk and tibial accelerometery. Runners with (n=14) and without (n=16) history of MTSS performed an outdoor fatigue run of 3200m...
October 23, 2017: Gait & Posture
Gautam Adusumilli, Solomon Eben Joseph, Michael A Samaan, Brooke Schultz, Tijana Popovic, Richard B Souza, Sharmila Majumdar
BACKGROUND: Performance tests are important to characterize patient disabilities and functional changes. The Osteoarthritis Research Society International and others recommend the 30-second Chair Stand Test and Stair Climb Test, among others, as core tests that capture two distinct types of disability during activities of daily living. However, these two tests are limited by current protocols of testing in clinics. There is a need for an alternative that allows remote testing of functional capabilities during these tests in the osteoarthritis patient population...
October 27, 2017: JMIR MHealth and UHealth
Matthew M Engelhard, Stephen D Patek, John C Lach, Myla D Goldman
BACKGROUND: Habitual physical activity (HPA) measurement addresses the impact of MS on real-world walking, yet its interpretation is confounded by the competing influences of MS-associated walking capacity and physical activity behaviors. OBJECTIVE: To develop specific measures of MS-associated walking capacity through statistically sophisticated HPA analysis, thereby more precisely defining the real-world impact of disease. METHODS: Eighty-eight MS and 38 control subjects completed timed walks and patient-reported outcomes in clinic, then wore an accelerometer for 7days...
October 16, 2017: Gait & Posture
Michelle R Conway, Mallory R Marshall, Rebecca A Schlaff, Karin A Pfeiffer, James M Pivarnik
Current physical activity (PA) recommendations for women experiencing a normal pregnancy reflect recent research showing numerous health benefits for mother and offspring. However, few studies have evaluated PA devices' reliability and validity during pregnancy, as anatomical and physiological changes throughout gestation could affect an instrument's accuracy. PURPOSE: To determine the reliability and validity of PA devices worn on the hip, ankle, and triceps during pregnancy and post-partum...
October 26, 2017: Medicine and Science in Sports and Exercise
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