Invariance of Wearing Location of Omron-BI Pedometers: A Validation Study

2010 ◽  
Vol 7 (6) ◽  
pp. 706-717 ◽  
Author(s):  
Weimo Zhu ◽  
Miyoung Lee
Keyword(s):  
Validation Study ◽  
Absolute Error ◽  
Activity Monitor ◽  
Error Rates ◽  
Living Conditions ◽  
The Body ◽  
Validity And Reliability ◽  
Free Living ◽  
Climbing Stairs ◽  
Free Living Conditions

Background:The purpose of this study was to investigate the validity and reliability evidences of the Omron BI pedometer, which could count steps taken even when worn at different locations on the body.Methods:Forty (20 males and 20 females) adults were recruited to walk wearing 5 sets, 1 set at a time, of 10 BI pedometers during testing, 1 each at 10 different locations. For comparison, they also wore 2 Yamax Digi-Walker SW-200 pedometers and a Dynastream AMP 331 activity monitor. The subjects walked in 3 free-living conditions: a fat sidewalk, stairs, and mixed conditions.Results:Except for a slight decrease in accuracy in the pant pocket locations, Omron BI pedometers counted steps accurately across other locations when subjects walked on the fat sidewalk, and the performance was consistent across devices and trials. When the subjects climbed up stairs, however, the absolute error % of the pant pocket locations increased significantly (P < .05) and similar or higher error rates were found in the AMP 331 and SW-200s.Conclusions:The Omron BI pedometer can accurately count steps when worn at various locations on the body in free-living conditions except for front pant pocket locations, especially when climbing stairs.

Validation Of The Fitbit Activity Monitor In Free-living Conditions

2015 ◽  
Vol 47 ◽  
pp. 260
Author(s):  
Wonwoo Byun ◽  
Nicklaus Redenius ◽  
Youngwon Kim
Keyword(s):  
Activity Monitor ◽  
Living Conditions ◽  
Free Living ◽  
Free Living Conditions

scholarly journals Fitbit Charge HR Wireless Heart Rate Monitor: Validation Study Conducted Under Free-Living Conditions

2017 ◽  
Vol 5 (10) ◽  
pp. e157 ◽  
Author(s):  
Alexander Wilhelm Gorny ◽  
Seaw Jia Liew ◽  
Chuen Seng Tan ◽  
Falk Müller-Riemenschneider
Keyword(s):  
Heart Rate ◽  
Validation Study ◽  
Living Conditions ◽  
Free Living ◽  
Heart Rate Monitor ◽  
Free Living Conditions

scholarly journals Wearable Egocentric Camera as a Monitoring Tool of Free-Living Cigarette Smoking: A Feasibility Study

2019 ◽  
Vol 22 (10) ◽  
pp. 1883-1890 ◽  
Author(s):  
Masudul H Imtiaz ◽  
Delwar Hossain ◽  
Volkan Y Senyurek ◽  
Prajakta Belsare ◽  
Stephen Tiffany ◽  
...  
Keyword(s):  
Cigarette Smoking ◽  
Feasibility Study ◽  
Sensor Placement ◽  
Smoking Behavior ◽  
Living Conditions ◽  
The Body ◽  
Sensor System ◽  
Monitoring Tool ◽  
Free Living ◽  
Free Living Conditions

Abstract Introduction Wearable sensors may be used for the assessment of behavioral manifestations of cigarette smoking under natural conditions. This paper introduces a new camera-based sensor system to monitor smoking behavior. The goals of this study were (1) identification of the best position of sensor placement on the body and (2) feasibility evaluation of the sensor as a free-living smoking-monitoring tool. Methods A sensor system was developed with a 5MP camera that captured images every second for continuously up to 26 hours. Five on-body locations were tested for the selection of sensor placement. A feasibility study was then performed on 10 smokers to monitor full-day smoking under free-living conditions. Captured images were manually annotated to obtain behavioral metrics of smoking including smoking frequency, smoking environment, and puffs per cigarette. The smoking environment and puff counts captured by the camera were compared with self-reported smoking. Results A camera located on the eyeglass temple produced the maximum number of images of smoking and the minimal number of blurry or overexposed images (53.9%, 4.19%, and 0.93% of total captured, respectively). During free-living conditions, 286,245 images were captured with a mean (±standard deviation) duration of sensor wear of 647(±74) minutes/participant. Image annotation identified consumption of 5(±2.3) cigarettes/participant, 3.1(±1.1) cigarettes/participant indoors, 1.9(±0.9) cigarettes/participant outdoors, and 9.02(±2.5) puffs/cigarette. Statistical tests found significant differences between manual annotations and self-reported smoking environment or puff counts. Conclusions A wearable camera-based sensor may facilitate objective monitoring of cigarette smoking, categorization of smoking environments, and identification of behavioral metrics of smoking in free-living conditions. Implications The proposed camera-based sensor system can be employed to examine cigarette smoking under free-living conditions. Smokers may accept this unobtrusive sensor for extended wear, as the sensor would not restrict the natural pattern of smoking or daily activities, nor would it require any active participation from a person except wearing it. Critical metrics of smoking behavior, such as the smoking environment and puff counts obtained from this sensor, may generate important information for smoking interventions.

scholarly journals How Well iPhones Measure Steps in Free-Living Conditions: Cross-Sectional Validation Study

10.2196/10418 ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. e10418 ◽  
Author(s):  
Shiho Amagasa ◽  
Masamitsu Kamada ◽  
Hiroyuki Sasai ◽  
Noritoshi Fukushima ◽  
Hiroyuki Kikuchi ◽  
...  
Keyword(s):  
Validation Study ◽  
Living Conditions ◽  
Free Living ◽  
Cross Sectional ◽  
Free Living Conditions

scholarly journals Assessment of Activity Monitor Placement During Free‐Living Conditions

2018 ◽  
Vol 32 (S1) ◽  
Author(s):  
Monroe J. Molesky ◽  
John Vusich ◽  
Alexander HK. Montoye
Keyword(s):  
Activity Monitor ◽  
Living Conditions ◽  
Free Living ◽  
Free Living Conditions

Comparison of Activity Monitor Output in Free Living Conditions

2008 ◽  
Vol 40 (Supplement) ◽  
pp. S208
Author(s):  
James C. Hannon ◽  
Mark G. Abel ◽  
Tia Lillie ◽  
Katie Sell ◽  
David Anderson ◽  
...  
Keyword(s):  
Activity Monitor ◽  
Living Conditions ◽  
Free Living ◽  
Free Living Conditions

scholarly journals Comparison of Energy Expenditure Assessed Using Wrist- and Hip-Worn ActiGraph GT3X in Free-Living Conditions in Young and Older Adults

2021 ◽  
Vol 8 ◽  
Author(s):  
Amine Guediri ◽  
Louise Robin ◽  
Justine Lacroix ◽  
Timothee Aubourg ◽  
Nicolas Vuillerme ◽  
...  
Keyword(s):  
Physical Activity ◽  
Older Adults ◽  
Energy Expenditure ◽  
Error Rate ◽  
Absolute Error ◽  
Living Conditions ◽  
Free Living ◽  
Activity Trackers ◽  
The Absolute ◽  
Free Living Conditions

The World Health Organization has presented their recommendations for energy expenditure to improve public health. Activity trackers do represent a modern solution for measuring physical activity, particularly in terms of steps/day and energy expended in physical activity (active energy expenditure). According to the manufacturer's instructions, these activity trackers can be placed on different body locations, mostly at the wrist and the hip, in an undifferentiated manner. The objective of this study was to compare the absolute error rate of active energy expenditure measured by a wrist-worn and hip-worn ActiGraph GT3X+ over a 24-h period in free-living conditions in young and older adults. Over the period of a 24-h period, 22 young adults and 22 older adults were asked to wear two ActiGraph GT3X+ at two different body locations recommended by the manufacturer, namely one around the wrist and one above the hip. Freedson algorithm was applied for data analysis. For both groups, the absolute error rate tended to decrease from 1,252 to 43% for older adults and from 408 to 46% for young participants with higher energy expenditure. Interestingly, for both young and older adults, the wrist-worn ActiGraph provided a significantly higher values of active energy expenditure (943 ± 264 cal/min) than the hip-worn (288 ± 181 cal/min). Taken together, these results suggest that caution is needed when using active energy expenditure as an activity tracker-based metric to quantify physical activity.

scholarly journals Interinstrument Reliability of the ActiGraph GT3X+ Ambulatory Activity Monitor During Free-Living Conditions in Adults

2015 ◽  
Vol 12 (3) ◽  
pp. 382-387 ◽  
Author(s):  
Haydn Jarrett ◽  
Liam Fitzgerald ◽  
Ash C. Routen
Keyword(s):  
Vigorous Physical Activity ◽  
Research Question ◽  
Intraclass Correlation ◽  
Activity Monitor ◽  
Living Conditions ◽  
Vigorous Activity ◽  
Ambulatory Activity ◽  
Free Living ◽  
Percent Difference ◽  
Free Living Conditions

Background:Currently, no studies have investigated interinstrument reliability of the ActiGraph (AG) GT3X+ in free-living conditions.Methods:Nineteen adults (11 males, 8 females; aged 36.8 ± 11.9 years) wore a pair of AG’s (one on each hip), during all waking hours for 1 day. Raw outputs were generated for total counts, steps, wear time and mean counts per minute. Intensity outputs were derived for time (minutes) spent in <moderate, moderate, vigorous, very vigorous and moderate-to-vigorous physical activity (MVPA). Intraclass correlation (ICC), absolute percent difference (APD), coefficient of variation (CV), Bland-Altman plots, and paired t tests were used to evaluate reliability.Results:Interinstrument reliability was high (CV < 5%) for raw count and derived intensity outputs, except vigorous and very vigorous activity. ICC, CV, and APD values for vigorous and very vigorous were .97, 12.28, 17.36% and .98, 18.15, 25.67%, respectively. Amalgamating moderate, vigorous, and very vigorous into a single MVPA category reduced the CV and APD values to 2.85 and 4.02%, and increased the ICC value to .99. No significant differences were found between contralateral units for any outputs (P > .05).Conclusion:Reliability decreases beyond moderate intensities. MVPA displays superior interinstrument reliability than individual intensity categories. Research question permitting, reporting time in MVPA may maximize reliability.

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