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Accelerometry

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https://www.readbyqxmd.com/read/27906317/theoretical-modeling-and-experimental-demonstration-of-raman-probe-induced-spectral-dip-for-realizing-a-superluminal-laser
#1
Joshua Yablon, Zifan Zhou, Minchuan Zhou, Ye Wang, S Tseng, M S Shahriar
We have demonstrated experimentally a Diode-Pumped Alkali Laser (DPAL) with a Raman resonance induced dip in the center of the gain profile, in order to produce an anomalous dispersion, necessary for making the laser superluminal. Numerical calculations match closely with experimental results, and indicate that the laser is operating superluminally, with the group index far below unity (~0.00526) at the center of the dip. The estimated factor of enhancement in the sensitivity to cavity length perturbation is ~190, approximately equaling the inverse of the group index...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27905643/-inverse-association-of-cardiorespiratory-fitness-with-cardiovascular-risk-factors-in-chilean-adults
#2
Carlos Cristi-Montero, Rodrigo Ramírez-Campillo, Cristian Alvarez, Alex Garrido Méndez, María Adela Martínez, Ximena Díaz Martínez, Ana María Leiva, Carlos Salas, Manuel Gutiérrez, Ruth Sanzana-Inzunza, Eliana Durán, Ana María Labraña, Nicolás Aguilar-Farías, Carlos Celis-Morales
BACKGROUND: A high level of cardiorespiratory fitness (CRF) is an important protector against cardiovascular and metabolic diseases. AIM: To explore the association of CRF with several metabolic markers and estimate the variation of these parameters by an increase of 1 MET change in CRF. MATERIAL AND METHODS: Cross-sectional study of 447 adults (56% women) without medical history of cardiometabolic diseases. Physical activity evaluated using accelerometry, body mass index (BMI), blood pressure, blood glucose and insulin and lipid profile were measured...
August 2016: Revista Médica de Chile
https://www.readbyqxmd.com/read/27905148/simultaneous-validation-of-five-activity-monitors-for-use-in-adult-populations
#3
C Powell, B P Carson, K P Dowd, A E Donnelly
Numerous cut-points exist to measure physical activity by accelerometry. The ability to compare accelerometer findings from different devices from different locations may be advantageous to researchers. This study aimed to develop and validate cut-points for 1.5, 3, and 6 METs in five activity monitors simultaneously. Fifty-six participants (mean age=39.9 [±11.5] years) performed six activities while wearing a CosMED K4b(2) and five activity monitors: activPAL3 Micro, activPAL, ActiGraph GT1M, ActiGraph wGT3X-BT, and GENEActiv...
December 1, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27904925/breaking-sitting-with-light-activities-vs-structured-exercise-a-randomised-crossover-study-demonstrating-benefits-for-glycaemic-control-and-insulin-sensitivity-in-type-2-diabetes
#4
Bernard M F M Duvivier, Nicolaas C Schaper, Matthijs K C Hesselink, Linh van Kan, Nathalie Stienen, Bjorn Winkens, Annemarie Koster, Hans H C M Savelberg
AIMS/HYPOTHESIS: We aimed to examine the effects of breaking sitting with standing and light-intensity walking vs an energy-matched bout of structured exercise on 24 h glucose levels and insulin resistance in patients with type 2 diabetes. METHODS: In a randomised crossover study, 19 patients with type 2 diabetes (13 men/6 women, 63 ± 9 years old) who were not using insulin each followed three regimens under free-living conditions, each lasting 4 days: (1) Sitting: 4415 steps/day with 14 h sitting/day; (2) Exercise: 4823 steps/day with 1...
December 1, 2016: Diabetologia
https://www.readbyqxmd.com/read/27896298/applying-latent-class-assignments-for-accelerometry-data-to-external-populations-data-from-the-national-health-and-nutrition-examination-survey-2003-2006
#5
Kelly R Evenson, Fang Wen, Annie Green Howard, Amy H Herring
Latent class analysis can identify unmeasured mutually exclusive categories (class membership) among participants for either observed categorical or continuous variables. More recently, latent class analysis has been applied to accelerometry to better understand the day-to-day patterns of physical activity and sedentary behavior. Typically, the class assignments are only relevant to the study for which they were derived and not made available for others to use. Using one-week accelerometry (ActiGraph #AM7164) data collected from the National Health and Nutrition Examination Survey during 2003-2006, latent classes of physical activity and sedentary behavior were derived separately for youths 6-17 years and adults >=18 years...
December 2016: Data in Brief
https://www.readbyqxmd.com/read/27895473/calf-raise-senior-a-new-test-for-assessment-of-plantar-flexor-muscle-strength-in-older-adults-protocol-validity-and-reliability
#6
Helô-Isa André, Filomena Carnide, Edgar Borja, Fátima Ramalho, Rita Santos-Rocha, António P Veloso
PURPOSE: This study aimed to develop a new field test protocol with a standardized measurement of strength and power in plantar flexor muscles targeted to functionally independent older adults, the calf-raise senior (CRS) test, and also evaluate its reliability and validity. PATIENTS AND METHODS: Forty-one subjects aged 65 years and older of both sexes participated in five different cross-sectional studies: 1) pilot (n=12); 2) inter- and intrarater agreement (n=12); 3) construct (n=41); 4) criterion validity (n=33); and 5) test-retest reliability (n=41)...
2016: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/27892780/associations-between-prolonged-sedentary-time-and-breaks-in-sedentary-time-with-cardiometabolic-risk-in-10-14-year-old-children-the-happy-study
#7
Daniel P Bailey, Sarah J Charman, Thomas Ploetz, Louise A Savory, Catherine J Kerr
This study examines the association between prolonged sedentary time and breaks in sedentary time with cardiometabolic risk in 10-14-year-old children. This cross-sectional design study analysed accelerometry-determined sedentary behaviour and physical activity collected over 7 days from 111 (66 girls) UK schoolchildren. Objective outcome measures included waist circumference, fasting lipids, fasting glucose, blood pressure, and cardiorespiratory fitness. Logistic regression was used for the main data analysis...
November 28, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27892704/the-effects-of-a-16-week-aerobic-exercise-programme-on-cognitive-function-in-people-living-with-hiv
#8
Adam McDermott, Lilia Zaporojan, Patricia McNamara, Colin P Doherty, Janice Redmond, Cuisle Forde, John Gormley, Mikel Egaña, Colm Bergin
High levels of cardiovascular fitness and physical activity are associated with higher levels of cognitive function in people with HIV, thus, they may reduce the risk of developing HIV-associated neurocognitive disorder (HAND). This study aimed to investigate the effects of a 16-week aerobic exercise intervention on cognitive function in people with HIV. Eleven participants living with HIV were recruited into the study. Participants were randomised into either an exercise group (n = 5), that completed a 16-week aerobic exercise programme training, 3 times per week (2 supervised sessions and one unsupervised session) or a control group (n = 6) that received no intervention...
November 28, 2016: AIDS Care
https://www.readbyqxmd.com/read/27892422/prognostic-value-of-serial-six-minute-walk-tests-using-tele-accelerometry-in-patients-with-chronic-heart-failure-a-pre-specified-sub-study-of-the-tim-hf-trial
#9
Sandra Prescher, Christoph Schoebel, Kerstin Koehler, Oliver Deckwart, Brunhilde Wellge, Marcus Honold, Oliver Hartmann, Sebastian Winkler, Friedrich Koehler
BACKGROUND: The six-minute walk test (6MWT) is an established functional test assessing exercise capacity and is used to predict clinical prognosis in patients with chronic heart failure (HF). Tele-accelerometry is a novel approach to activity monitoring using telemedical data transfer and allows a Tele-6MWT to be performed in an outpatient setting. It offers patients the option of performing simple serial follow-up tests in their own home. AIMS: The aim of this study was to investigate the prognostic value of serial Tele-6MWTs using tele-accelerometry in patients with HF...
October 2016: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/27891655/a-comparison-of-parent-and-childcare-provider-s-attitudes-and-perceptions-about-preschoolers-physical-activity-and-outdoor-time
#10
P S Tandon, B E Saelens, K A Copeland
BACKGROUND: Young children depend on adult caregivers to provide opportunities for physical activity. Research has focused on barriers and facilitators to children's physical activity while in childcare, but parental influences remain largely unknown. This study examines parent's attitudes about preschoolers' physical activity and outdoor time, compares them with those of childcare providers and determines the association between parental attitudes and preschoolers' measured activity...
November 28, 2016: Child: Care, Health and Development
https://www.readbyqxmd.com/read/27890482/dietary-nitrate-does-not-affect-physical-activity-outcomes-in-health-older-adults-in-a-randomized-crossover-trial
#11
Mario Siervo, Clio Oggioni, Djordje G Jakovljevic, Michael Trenell, John C Mathers, David Houghton, Carlos Celis-Morales, Ammar W Ashor, Alan Ruddock, Mayur Ranchordas, Markos Klonizakis, Elizabeth A Williams
Although dietary nitrate (NO3(-)) ingestion appears to enhance exercise capacity and performance in young individuals, inconclusive findings have been reported in older people. Therefore, we conducted a double-blind, crossover randomized clinical trial using beetroot juice in older healthy participants, who were classified as normal weight and overweight. We tested whether consumption of beetroot juice (a rich source of NO3(-)) for 1 week would increase nitric oxide bioavailability via the nonenzymatic pathway and enhance (1) exercise capacity during an incremental exercise test, (2) physical capability, and (3) free-living physical activity...
November 14, 2016: Nutrition Research
https://www.readbyqxmd.com/read/27889332/effect-of-an-aerobic-exercise-intervention-on-cardiac-autonomic-regulation-a-worksite-rct-among-cleaners
#12
David M Hallman, Andreas Holtermann, Karen Søgaard, Peter Krustrup, Jesper Kristiansen, Mette Korshøj
OBJECTIVE: The aim of this randomized controlled trial (RCT) was to determine whether aerobic exercise during work hours affects cardiac autonomic regulation in cleaners characterized by high levels of occupational physical activity and poor cardiorespiratory fitness. METHOD: Eligible cleaners (n=116) were randomized to an aerobic exercise group (n=59) or a reference group (n=57) with lectures. The intervention group received two 30-min sessions per week of supervised aerobic exercise over 4months...
November 23, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27887654/proportion-of-children-meeting-recommendations-for-24-hour-movement-guidelines-and-associations-with-adiposity-in-a-12-country-study
#13
Blanca Roman-Viñas, Jean-Philippe Chaput, Peter T Katzmarzyk, Mikael Fogelholm, Estelle V Lambert, Carol Maher, Jose Maia, Timothy Olds, Vincent Onywera, Olga L Sarmiento, Martyn Standage, Catrine Tudor-Locke, Mark S Tremblay
BACKGROUND: The Canadian 24-h movement guidelines were developed with the hope of improving health and future health outcomes in children and youth. The purpose of this study was to evaluate adherence to the 3 recommendations most strongly associated with health outcomes in new 24-h movement guidelines and their relationship with adiposity (obesity and body mass index z-score) across countries participating in the International Study of Childhood Obesity, Lifestyle and the Environment (ISCOLE)...
November 25, 2016: International Journal of Behavioral Nutrition and Physical Activity
https://www.readbyqxmd.com/read/27887610/integral-strategy-to-supportive-care-in-breast-cancer-survivors-through-occupational-therapy-and-a-m-health-system-design-of-a-randomized-clinical-trial
#14
Mario Lozano-Lozano, Lydia Martín-Martín, Noelia Galiano-Castillo, Francisco Álvarez-Salvago, Irene Cantarero-Villanueva, Carolina Fernández-Lao, Carmen Sánchez-Salado, Manuel Arroyo-Morales
BACKGROUND: Technological support using e-health mobile applications (m-health) is a promising strategy to improve the adherence to healthy lifestyles in breast cancer survivors (excess in energy intake or low physical activity are determinants of the risk of recurrence, second cancers and cancer mortality). Moreover, cancer rehabilitation programs supervised by health professionals are needed due to the inherent characteristics of these breast cancer patients. Our main objective is to compare the clinical efficacy of a m-health lifestyle intervention system alone versus an integral strategy to improve Quality of Life in breast cancer survivors...
November 25, 2016: BMC Medical Informatics and Decision Making
https://www.readbyqxmd.com/read/27882777/real-time-visual-activity-feedback-for-physical-activity-improvement-in-breast-and-colon-cancer-patients
#15
Lars Gabrys, Stefan Sperzel, Marcus Bernhoerster, Winfried Banzer, Lutz Vogt
The study aims to evaluate the effects and feasibility of a biofeedback device for physical activity (PA) improvement in breast and colon cancer patients. Daily PA of 19 cancer patients was measured by accelerometry (ActiGraph, GT1 M). Additionally, patients wore a motion sensor with real-time visual activity feedback (ActiSmile). Counts per minutes (cpm) and moderate to vigorous physical activity (MVPA) were calculated and patients' activity data were compared to PA of 20 age-matched healthy controls. Baseline PA of patients was lower compared to controls...
November 24, 2016: Research in Sports Medicine
https://www.readbyqxmd.com/read/27881859/friends-and-social-contexts-as-unshared-environments-a-discordant-sibling-analysis-of-obesity-and-health-related-behaviors-in-young-adolescents
#16
S- Salvy, D M Feda, L H Epstein, J N Roemmich
OBJECTIVE: This study examines the contribution of best friends' weight and the peer social context (time spent alone versus with friends) as sources of unshared environment associated with variability in weight and health behaviors among weight-discordant siblings. METHODS: Pairs of same-sex biologic siblings (N=40 pairs; ages 13-17) were originally recruited as part of a study evaluating putative factors contributing to differences in adiposity among weight-discordant siblings...
November 24, 2016: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/27876008/physical-activity-and-metabolic-health-in-chronic-kidney-disease-a-cross-sectional-study
#17
Wilson Bowlby, Leila R Zelnick, Connor Henry, Jonathan Himmelfarb, Steven E Kahn, Bryan Kestenbaum, Cassianne Robinson-Cohen, Kristina M Utzschneider, Ian H de Boer
BACKGROUND: Patients with chronic kidney disease (CKD) are at high risk of progression to end stage renal disease and cardiovascular events. Physical activity may reduce these risks by improving metabolic health. We tested associations of physical activity with central components of metabolic health among people with moderate-severe non-diabetic CKD. METHODS: We performed a cross-sectional study of 47 people with CKD (estimated GFR <60 ml/min/1.73 m(2)) and 29 healthy control subjects...
November 22, 2016: BMC Nephrology
https://www.readbyqxmd.com/read/27872802/park-use-is-associated-with-less-sedentary-time-among-low-income-parents-and-their-preschool-child-the-net-works-study
#18
Simone A French, Nancy E Sherwood, Nathan R Mitchell, Yingling Fan
INTRODUCTION: Parks are an important component of the neighborhood environment, and their presence is believed to support higher levels of physical activity among residents. The present study examined park use frequency among a sample of 534 low-income parents of preschool aged children. Associations with child and parent physical activity, neighborhood characteristics and physical characteristics of the block immediately surrounding the home were examined. METHODS: Data are from baseline measurements completed in 2012-2014 as part of larger study (NET-Works: Now Everybody Together for Amazing and Healthy Kids) targeting low-income preschool children and their parents (N = 534 parent-child dyads)...
March 2017: Preventive Medicine Reports
https://www.readbyqxmd.com/read/27870794/comparison-of-measures-of-maximal-and-submaximal-fitness-in-response-to-exercise
#19
John Clarke, Louise de Lannoy, Robert Ross
INTRODUCTION: Adoption of physical activity (PA) consistent with current guidelines does not improve cardiorespiratory fitness (VO2peak, (mCRF)) beyond the error of measurement for approximately 30% of adults. Whether PA improves measures of exercise tolerance at submaximal levels (submaximal cardiorespiratory fitness (sCRF)) independent of change in mCRF is unknown. Here we assessed the relationship between exercise-induced changes in mCRF and sCRF. METHODS: Twenty-five physically inactive men aged 30-60 years ([mean (SD)], 44...
November 19, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27866384/schoolyard-characteristics-physical-activity-and-sedentary-behavior-combining-gps-and-accelerometry
#20
Dave H H Van Kann, Sanne I de Vries, Jasper Schipperijn, Nanne K de Vries, Maria W J Jansen, Stef P J Kremers
BACKGROUND: Physical activity (PA) is decreasing among children, while sedentary behavior (SB) is increasing. Schoolyards seem suitable settings to influence children's PA behavior. This study investigated the associations between schoolyard characteristics and moderate-to-vigorous physical activity (MVPA) and SB of children aged 8-11 years at schoolyards. METHODS: Twenty primary schools in the Netherlands were involved. A total of 257 children wore an accelerometer and global positioning system (GPS) device for 5 consecutive days to objectively assess their PA levels and presence at the schoolyard, respectively...
December 2016: Journal of School Health
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