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Dave H H Van Kann, S I de Vries, J Schipperijn, N K de Vries, M W J Jansen, S P J Kremers
Background Aim of the study was to test the 12-month effects of a multicomponent physical activity (PA) intervention at schoolyards on recess PA levels of 6th and 7th grade children in primary schools, combining Global Positioning System (GPS) and accelerometry data. Methods A quasi-experimental study design was used with 20 paired intervention and control schools. GPS confirmatory analyses were applied to validate attendance at schoolyards during recess. Data from 376 children from 7 pairs of schools were included in the final analyses...
October 24, 2016: Journal of Physical Activity & Health
Paul D Loprinzi, Meghan K Edwards, Eveleen Sng, Ovuokerie Addoh
Background: The purpose of this study was to examine the association of accelerometer-assessed sedentary behavior and residual-specific mortality. Methods: Data from the 2003-2006 National Health and Nutrition Examination Survey (NHANES) were used (N = 5536), with follow-up through 2011. Sedentary behavior was objectively measured over 7 days via accelerometry. Results: When expressing sedentary behavior as a 60 min/day increase, the hazard ratio across the models ranged from 1.07-1.40 (P < 0.05). There was evidence of an interaction effect between sedentary behavior and total physical activity on residual-specific mortality (Hazard ratiointeraction [HR] = 0...
2016: Health Promotion Perspectives
Kelly R Evenson, Fang Wen, Amy H Herring
The US physical activity (PA) recommendations were based primarily on studies in which self-reported data were used. Studies that include accelerometer-assessed PA and sedentary behavior can contribute to these recommendations. In the present study, we explored the associations of PA and sedentary behavior with all-cause and cardiovascular disease (CVD) mortality in a nationally representative sample. Among the 2003-2006 National Health and Nutrition Examination Survey cohort, 3,809 adults 40 years of age or older wore an accelerometer for 1 week and self-reported their PA levels...
October 19, 2016: American Journal of Epidemiology
Wendy Yajun Huang, Stephen Heung-Sang Wong, Gang He, J O Salmon
PURPOSE: This study examined the prospective associations of reallocating time spent in different types of sedentary behavior, physical activity, and sleep with body mass index (BMI) in children using isotemporal substitution analysis. METHODS: Chinese children in grades 1-3 were recruited to a cohort study in 2009 and were followed up over a 2-yr period. Reports were gathered from the parents on children's sedentary behavior, sleep duration, and sociodemographic variables...
November 2016: Medicine and Science in Sports and Exercise
Jacqueline Kerr, Catherine R Marinac, Katherine Ellis, Suneeta Godbole, Aaron Hipp, Karen Glanz, Jonathan Mitchell, Francine Laden, Peter James, David Berrigan
PURPOSE: To compare physical activity estimates across different accelerometer wear locations, wear time protocols, and data processing techniques. METHODS: A convenience sample of middle aged to older women wore a GT3X+ accelerometer at the wrist and hip for 7 days. Physical activity estimates were calculated using three data processing techniques: single axis cut points, raw vector magnitude thresholds, and machine learning algorithms applied to the raw data from the three axes...
October 14, 2016: Medicine and Science in Sports and Exercise
Jonathan A Mitchell, Marsha Dowda, Russell R Pate, Katarzyna Kordas, Karsten Froberg, Luís B Sardinha, Elin Kolle, Angela Page
PURPOSE: We aimed to determine if moderate-to-vigorous physical activity (MVPA) and sedentary behavior (SB) were independently associated with body mass index (BMI) and waist circumference (WC) in children and adolescents. METHODS: Data from the International Children's Accelerometry Database (ICAD) were used to address our objectives (N=11,115; 6-18y; 51% female). We calculated age and gender specific body mass index (BMI) and waist circumference (WC) Z-scores and used accelerometry to estimate MVPA and total SB...
October 17, 2016: Medicine and Science in Sports and Exercise
Amal A Wanigatunga, Paul V Nickerson, Todd M Manini, Parisa Rashidi
The objective of this analysis was to apply symbolic aggregate approximation (SAX) time-series analysis to accelerometer data for activity pattern visualization stratified by self-reported mobility difficulty. A total of 2393 (71.6  ±  7.9 years old) participants wore an accelerometer on the hip (4  +  d; 10  +  h) during the national health and nutrition examination survey (NHANES), a biannual series of health assessments of the US population. One minute epoch data was used to perform SAX, which converted accelerometry time series data into four activity levels...
October 18, 2016: Physiological Measurement
Jing-Jing Wang, Tom Baranowski, Patrick W C Lau, Tzu-An Chen, Shu-Ge Zhang
This study aimed to explore the associations among psychological correlates and physical activity (PA) in Chinese children and to further examine whether these associations varied by different PA measures. PA self-efficacy, motivation, and preference were reported in 449 8-13-year-old Chinese children (252 males). Moderate- to vigorous- intensity PA (MVPA) was measured by the Physical Activity Questionnaire for Older Children (PAQ-C) and with an ActiGraph GT3X accelerometer. Correlations and hierarchical regressions were performed to explore their associations...
October 13, 2016: International Journal of Environmental Research and Public Health
Päivi Kolu, Kari Tokola, Markku Kankaanpää, Jaana Suni
STUDY DESIGN: A cross-sectional study, part of a randomized controlled trial. OBJECTIVE: To evaluate the association of physical activity, cardiorespiratory fitness, and neuromuscular fitness with direct health-care costs and sickness-related absence among nursing personnel with nonspecific low back pain. SUMMARY OF BACKGROUND DATA: Low back pain creates a huge economic burden due to increased sick leave and use of health-care services. METHODS: Female nursing personnel with nonspecific low back pain were included (n = 219)...
October 6, 2016: Spine
Andrew N Reynolds, Jim I Mann, Sheila Williams, Bernard J Venn
AIMS/HYPOTHESIS: Regular physical activity is a cornerstone of diabetes management. We conducted a study to evaluate whether specifying the timing of walking in relation to meals enhances the benefits conferred by current physical activity guidelines. METHODS: A total of 41 adults with type 2 diabetes mellitus (mean ± SD age 60 ± 9.9 years; mean diabetes duration 10 years) participated in this randomised, crossover study. Randomisation was by a computer-generated protocol...
October 17, 2016: Diabetologia
Dan W Teng, Charles L Eddy, Damian G Kelty-Stephen
Blindwalking to replicate an instructed distance requires various sensory signals. Recent evidence in movement science across many organisms suggests that multifractal organization of connective tissue supports the use of these signals. Multifractal structure is a multiplicity of power laws defining distribution of proportion across many time scales that helps predict judgments of the objects' length. Present work tests whether the multifractal structure in postural accelerometry during blindwalking predicts blindwalking distance replications...
October 14, 2016: Attention, Perception & Psychophysics
Catherine M Wright, Paula J Duquesnay, Stephanie Anzman-Frasca, Virginia R Chomitz, Kenneth Chui, Christina D Economos, Elizabeth G Langevin, Miriam E Nelson, Jennifer M Sacheck
BACKGROUND: Physical activity (PA) is critical to preventing childhood obesity and contributes to children's overall physical and cognitive health, yet fewer than half of all children achieve the recommended 60 min per day of moderate-to-vigorous physical activity (MVPA). Schools are an ideal setting to meeting PA guidelines, but competing demands and limited resources have impacted PA opportunities. The Fueling Learning through Exercise (FLEX) Study is a randomized controlled trial that will evaluate the impact of two innovative school-based PA programs on children's MVPA, cognitive function, and academic outcomes...
October 13, 2016: BMC Public Health
Asal Moghaddaszadeh, Veronica Jamnik, Angelo N Belcastro
BACKGROUND: Emerging evidence suggests that oxygen consumption (VO2) for self-paced physical activity (PA) is underestimated when applying laboratory-based treadmill (TM)-derived regression equations. This study examines the accelerometer (ACC) characteristics for paced TM PA and self-paced children's PA to ascertain if the predictable regulated patterns of paced PA are implicated in the inferior estimates of VO2. METHODS: Children's (9.3±1.2 yrs) (n=21) VO2 (portable oxygen analyzer) and PA (accelerometry) were measured for paced treadmill PA (4-10km/h)...
October 13, 2016: Journal of Sports Medicine and Physical Fitness
Hanneke Ac van Helvoort, Laura M Willems, Pn Richard Dekhuijzen, Hieronymus Wh van Hees, Yvonne F Heijdra
In patients with chronic obstructive pulmonary disease (COPD), exercise capacity is reduced, resulting over time in physical inactivity and worsened health status. It is unknown whether ventilatory constraints occur during activities of daily life (ADL) in early stages of COPD. The aim of this study was to assess respiratory mechanics during ADL and to study its consequences on dyspnoea, physical activity and health status in early-stage COPD compared with healthy controls. In this cross-sectional study, 39 early-stage COPD patients (mean FEV1 88±s...
October 13, 2016: NPJ Primary Care Respiratory Medicine
Janet L Hauck, Leah R Ketcheson, Dale A Ulrich
BACKGROUND: Objective physical activity (PA) monitoring via accelerometry is both costly and time consuming. Furthermore, overall adherence to a monitoring protocol is often complicated by disability. Therefore, it is essential that strategies for supporting accelerometer wear for youth with disabilities are maximized. The purpose of this perspective was to provide researchers a set of efficacious PA monitoring strategies based on the retrospective examination of support methodology on adherence rates for youth with autism spectrum disorder (ASD)...
2016: Frontiers in Public Health
Lisa M Barnett, Jo Salmon, Kylie D Hesketh
BACKGROUND: Almost half of young children do not achieve minimum recommendations of 60 daily minutes in physical activity. Physical activity is potentially an important determinant of the development of motor competence in children. This study is one of very few longitudinal studies in this area and the first to investigate early childhood physical activity as a predictor of subsequent motor skill competence. METHODS: Children were assessed as part of the Melbourne InFANT Program longitudinal cohort study at 19 months, 3...
October 10, 2016: BMC Public Health
Stephanie A Grover, Carolyn P Sawicki, Dominique Kinnett-Hopkins, Marcia Finlayson, Jane E Schneiderman, Brenda Banwell, Christine Till, Robert W Motl, E Ann Yeh
OBJECTIVES: To investigate physical activity levels in youth with multiple sclerosis and monophasic acquired demyelinating syndromes ([mono-ADS], ie, children without relapsing disease) compared with healthy controls and to determine factors that contribute to engagement in physical activity. We hypothesized that greater physical activity goal setting and physical activity self-efficacy would be associated with greater levels of vigorous physical activity in youth with multiple sclerosis...
October 4, 2016: Journal of Pediatrics
Sally Pears, Maaike Bijker, Katie Morton, Joana Vasconcelos, Richard A Parker, Kate Westgate, Soren Brage, Ed Wilson, A Toby Prevost, Ann-Louise Kinmonth, Simon Griffin, Stephen Sutton, Wendy Hardeman
BACKGROUND: Very brief interventions (VBIs) for physical activity are promising, but there is uncertainty about their potential effectiveness and cost. We assessed potential efficacy, feasibility, acceptability, and cost of three VBIs in primary care, in order to select the most promising intervention for evaluation in a subsequent large-scale RCT. METHODS: Three hundred and ninety four adults aged 40-74 years were randomised to a Motivational (n = 83), Pedometer (n = 74), or Combined (n = 80) intervention, delivered immediately after a preventative health check in primary care, or control (Health Check only; n = 157)...
September 30, 2016: BMC Public Health
Iván González, Jesús Fontecha, Ramón Hervás, José Bravo
The purpose of this paper is to develop an accelerometry system capable of performing gait event demarcation and calculation of temporal parameters using a single waist-mounted device. Particularly, a mobile phone positioned over the L2 vertebra is used to acquire trunk accelerations during walking. Signals from the acceleration magnitude and the vertical acceleration are smoothed through different filters. Cut-off points between filtered signals as a result of convolving with varying levels of Gaussian filters and other robust features against temporal variation and noise are used to identify peaks that correspond to gait events...
December 2016: Journal of Medical Systems
Vincent T van Hees, Kathrin Thaler-Kall, Klaus-Hendrik Wolf, Jan C Brønd, Alberto Bonomi, Mareike Schulze, Matthäus Vigl, Bente Morseth, Laila Arnesdatter Hopstock, Lukas Gorzelniak, Holger Schulz, Søren Brage, Alexander Horsch
OBJECTIVES: Raw accelerometry is increasingly being used in physical activity research, but diversity in sensor design, attachment and signal processing challenges the comparability of research results. Therefore, efforts are needed to harmonize the methodology. In this article we reflect on how increased methodological harmonization may be achieved. METHODS: The authors of this work convened for a two-day workshop (March 2014) themed on methodological harmonization of raw accelerometry...
October 7, 2016: Methods of Information in Medicine
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