scholarly journals Measurement agreement between two activity monitors and a self-report recall measure under free-living conditions

2006 ◽  
Author(s):  
Miguel Andres Calabro
Keyword(s):  
Living Conditions ◽  
Self Report ◽  
Free Living ◽  
Activity Monitors ◽  
Free Living Conditions

Validity of activity monitors worn at multiple nontraditional locations under controlled and free-living conditions in young adult women

2015 ◽  
Vol 40 (5) ◽  
pp. 448-456 ◽  
Author(s):  
Hideaki Kumahara ◽  
Makoto Ayabe ◽  
Misato Ichibakase ◽  
Akari Tashima ◽  
Maiko Chiwata ◽  
...  
Keyword(s):  
Young Adult ◽  
Vigorous Physical Activity ◽  
Real Life ◽  
Living Conditions ◽  
Practical Reasons ◽  
Adult Women ◽  
Young Adult Women ◽  
Free Living ◽  
Activity Monitors ◽  
Free Living Conditions

The purpose of this study was to examine the validity of counting steps and computing indices of moderate-to-vigorous physical activity (MVPA) using miniature activity monitors with 3-D technology worn at various locations under controlled (CON) and free-living conditions (FL). Kenz e-style2, Tanita Calorism Smart, and Omron Calori Scan HJA-306 activity monitors were assessed. Nine and 31 young adult women were assigned to the CON and FL studies, respectively. While walking or jogging on a treadmill at 5 different speeds, the subjects simultaneously carried the 3 different monitors in a pants pocket (PP), a chest shirt pocket, and a shoulder bag (B). Under the FL condition, the 3 monitors were placed only at the PP and B locations for practical reasons. Significant effects of monitor location and walking/jogging speed on the step count measured by the 3 monitors were evaluated under the CON condition. Monitors placed at both PP and B tended to underestimate the number of steps; however, there were no significant differences between the values obtained with the Kenz monitor and those obtained with a criterion accelerometer under the FL condition. Moreover, strong correlations were observed between steps measured by monitors placed at PP and steps measured by the criterion accelerometer. The amount of MVPA for the PP location and the non-carrying duration of the bag for the B location were considered to be important determinants of the accuracy of step counting under the FL condition. In conclusion, monitors placed at the PP location, especially the Kenz monitor, showed acceptable accuracy for young adult women in real-life settings. In contrast, MVPA indices assessed using these monitors showed limited validity.

Physical Activity Monitor Accuracy for Overground Walking and Free-Living Conditions Among Pregnant Women

2020 ◽  
Vol 3 (2) ◽  
pp. 100-109
Author(s):  
Christopher P. Connolly ◽  
Jordana Dahmen ◽  
Robert D. Catena ◽  
Nigel Campbell ◽  
Alexander H.K. Montoye
Keyword(s):  
Physical Activity ◽  
Pregnant Women ◽  
Living Conditions ◽  
Overground Walking ◽  
Third Trimester ◽  
Free Living ◽  
Activity Monitors ◽  
Step Counting ◽  
Physical Activity Monitors ◽  
Free Living Conditions

Purpose: We aimed to determine the step-count validity of commonly used physical activity monitors for pregnancy overground walking and during free-living conditions. Methods: Participants (n = 39, 12–38 weeks gestational age) completed six 100-step overground walking trials (three self-selected “normal pace”, three “brisk pace”) while wearing five physical activity monitors: Omron HJ-720 (OM), New Lifestyles 2000 (NL), Fitbit Flex (FF), ActiGraph Link (AG), and Modus StepWatch (SW). For each walking trial, monitor-recorded steps and criterion-measured steps were assessed. Participants also wore all activity monitors for an extended free-living period (72 hours), with the SW used as the criterion device. Mean absolute percent error (MAPE) was calculated for overground walking and free-living protocols and compared across monitors. Results: For overground walking, the OM, NL, and SW performed well (<5% MAPE) for normal and brisk pace walking trials, and also when trials were analyzed by actual speeds. The AG and FF had significantly greater MAPE for overground walking trials (11.9–14.7%). Trimester did affect device accuracy to some degree for the AG, FF, and SW, with error being lower in the third trimester compared to the second. For the free-living period, the OM, NL, AG, and FF significantly underestimated (>32% MAPE) actual steps taken per day as measured by the criterion SW (M [SD] = 9,350 [3,910]). MAPE for the OM was particularly high (45.3%). Conclusion: The OM, NL, and SW monitors are valid measures for overground step-counting during pregnancy walking. However, the OM and NL significantly underestimate steps by second and third trimester pregnant women in free-living conditions.

scholarly journals A novel method to remotely measure food intake of free-living individuals in real time: the remote food photography method

2008 ◽  
Vol 101 (3) ◽  
pp. 446-456 ◽  
Author(s):  
Corby K. Martin ◽  
Hongmei Han ◽  
Sandra M. Coulon ◽  
H. Raymond Allen ◽  
Catherine M. Champagne ◽  
...  
Keyword(s):  
Food Selection ◽  
Reliability And Validity ◽  
Living Conditions ◽  
Self Report ◽  
Free Living ◽  
Pilot Studies ◽  
Validity Tests ◽  
Food Photography ◽  
Photography Method ◽  
Free Living Conditions

The aim of the present study was to report the first reliability and validity tests of the remote food photography method (RFPM), which consists of camera-enabled cell phones with data transfer capability. Participants take and transmit photographs of food selection and plate waste to researchers/clinicians for analysis. Following two pilot studies, adult participants (n 52; BMI 20–35 kg/m2 inclusive) were randomly assigned to the dine-in or take-out group. Energy intake (EI) was measured for 3 d. The dine-in group ate lunch and dinner in the laboratory. The take-out group ate lunch in the laboratory and dinner in free-living conditions (participants received a cooler with pre-weighed food that they returned the following morning). EI was measured with the RFPM and by directly weighing foods. The RFPM was tested in laboratory and free-living conditions. Reliability was tested over 3 d and validity was tested by comparing directly weighed EI to EI estimated with the RFPM using Bland–Altman analysis. The RFPM produced reliable EI estimates over 3 d in laboratory (r 0·62; P < 0·0001) and free-living (r 0·68; P < 0·0001) conditions. Weighed EI correlated highly with EI estimated with the RFPM in laboratory and free-living conditions (r>0·93; P < 0·0001). In two laboratory-based validity tests, the RFPM underestimated EI by − 4·7 % (P = 0·046) and − 5·5 % (P = 0·076). In free-living conditions, the RFPM underestimated EI by − 6·6 % (P = 0·017). Bias did not differ by body weight or age. The RFPM is a promising new method for accurately measuring the EI of free-living individuals. Error associated with the method is small compared with self-report methods.

scholarly journals Using Activity Monitors to Measure Physical Activity in Free-Living Conditions

2006 ◽  
Vol 86 (8) ◽  
pp. 1137-1145 ◽  
Author(s):  
Jaime E Berlin ◽  
Kristi L Storti ◽  
Jennifer S Brach
Keyword(s):  
Physical Activity ◽  
Living Conditions ◽  
Free Living ◽  
Activity Monitors ◽  
Free Living Conditions

scholarly journals The Validity of Consumer-Level Activity Monitors in Healthy Older Adults in Free-Living Conditions

2018 ◽  
Vol 26 (1) ◽  
pp. 128-135 ◽  
Author(s):  
Nicolas Farina ◽  
Ruth G. Lowry
Keyword(s):  
Older Adults ◽  
Low Cost ◽  
Living Conditions ◽  
Community Dwelling ◽  
Future Research ◽  
Free Living ◽  
Activity Monitors ◽  
And Function ◽  
Healthy Community ◽  
Free Living Conditions

Consumer-level activity monitors, such as Fitbit and Misfit devices, are a popular and low-cost means of measuring physical activity. This study aims to compare the accuracy of step counts from two consumer-level activity monitors against two reference devices in healthy, community-dwelling older adults in free-living conditions. Twenty-five older adults (aged 65–84) simultaneously wore 5 devices (e.g., Misfit Shine and Fitbit Charge HR) over 7 consecutive days. All consumer-level activity monitors positively correlated with reference devices (p < .001). There was also substantial to near perfect agreement between all consumer-level activity monitors and reference devices. Compared to the ActiGraph GT3X+, the waist-worn Misfit Shine displayed the highest agreement amongst the devices worn (ICC = 0.96, 95% 0.91 to 0.99). The wrist-worn devices showed poorer agreement to reference devices. Future research needs to consider that not all consumer-level activity monitors are equal in terms of accuracy, design, and function.

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