Validation of the Fitbit Charge 2 compared to the ActiGraph GT3X+ in older adults with knee osteoarthritis in free-living conditions

BACKGROUND Wrist worn consumer-grade activity trackers are popular devices, developed mainly for personal use, but with the potential to be used also for clinical and research purposes. OBJECTIVE The objective of this study was to explore the validity, reliability and sensitivity to change of movement behaviours metrics from three popular activity trackers (POLAR Vantage M, Garmin Vivosport and Garmin Vivoactive 4s) in controlled and free-living conditions when worn by older adults. METHODS Participants (n = 28; 74 ± 5 years) underwent a videotaped laboratory protocol while wearing all three activity trackers. On a separate occasion, participants wore one (randomly assigned) activity tracker and a research grade physical activity monitor ActiGraph wGT3X-BT simultaneously for six consecutive days for comparisons. RESULTS Both Garmin activity trackers showed excellent performance for step counts, with mean absolute percentage error (MAPE) below 20 % and intraclass correlation coefficient (ICC2,1) above 0.90 (P < .05), while Polar Vantage M substantially over counted steps (MAPE = 84 % and ICC2,1 = 0.37 for free-living conditions). MAPE for sleep time was within 10 % for all the trackers tested, while far beyond 20 % for all the physical activity and calories burned outputs. Both Garmin trackers showed fair agreement (ICC2,1 = 0.58–0.55) for measuring calories burned when compared with ActiGraph. CONCLUSIONS Garmin Vivoactive 4s showed overall best performance, especially for measuring steps and sleep time in healthy older adults. Minimal detectible change was consistently lower for an average day measures than for a single day measure, but still relatively high. The results provided in this study could be used to guide choice on activity trackers aiming for different purposes – individual use/care, longitudinal monitoring or in clinical trial setting.

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Effect of the Intake of a Snack Containing Dietary Fiber on Postprandial Glucose Levels

Foods ◽

10.3390/foods9101500 ◽

2020 ◽

Vol 9 (10) ◽

pp. 1500

Author(s):

Hyeon-Ki Kim ◽

Takuya Nanba ◽

Mamiho Ozaki ◽

Hanako Chijiki ◽

Masaki Takahashi ◽

...

Keyword(s):

Older Adults ◽

Blood Glucose ◽

Dietary Fiber ◽

Postprandial Glucose ◽

Living Conditions ◽

Fiber Content ◽

Free Living ◽

Glucose Levels ◽

Blood Glucose Levels ◽

Free Living Conditions

To examine the effects of the intake of a snack containing dietary fiber under free-living conditions on postprandial glucose levels in older adults, nine healthy older adults aged 76.9 ± 1.6 years (mean ± standard error) completed two crossover trials: 1) regular snack (BISCUIT) intake and 2) intake of snacks with a high dietary fiber content (DF-BISCUIT). In both trials, each participant consumed either BISCUIT or DF-BISCUIT between lunch and dinner time for 1 week. During the intervention, the blood glucose levels of all the subjects were observed using a continuous glucose monitoring system. Lower 24 h blood glucose levels were yielded in the DF-BISCUIT than the BISCUIT trials. Moreover, compared to the BISCUIT trials, the blood glucose levels after dinner and areas under the curve (AUCs) were significantly decreased in the DF-BISCUIT treatments. The blood glucose levels and AUCs after the intake of the next day’s breakfast were suppressed in the DF-BISCUIT treatments compared to those in the BISCUIT trials. Our data indicate that the intake of snacks with a high dietary fiber content under free-living conditions is an effective way to restrain postprandial glucose levels and that the effect lasts until breakfast the next day.

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Validity, Reliability and Sensitivity to Change of Three Consumer-Grade Activity Trackers in Controlled and Free-Living Conditions among Older Adults

Sensors ◽

10.3390/s21186245 ◽

2021 ◽

Vol 21 (18) ◽

pp. 6245

Author(s):

Kaja Kastelic ◽

Marina Dobnik ◽

Stefan Löfler ◽

Christian Hofer ◽

Nejc Šarabon

Keyword(s):

Older Adults ◽

Intraclass Correlation ◽

Sleep Time ◽

Living Conditions ◽

Percentage Error ◽

Sensitivity To Change ◽

Free Living ◽

Step Counts ◽

Activity Trackers ◽

Free Living Conditions

Wrist-worn consumer-grade activity trackers are popular devices, developed mainly for personal use. This study aimed to explore the validity, reliability and sensitivity to change of movement behaviors metrics from three activity trackers (Polar Vantage M, Garmin Vivoactive 4s and Garmin Vivosport) in controlled and free-living conditions when worn by older adults. Participants (n = 28; 74 ± 5 years) underwent a videotaped laboratory protocol while wearing all three trackers. On a separate occasion, participants (n = 17 for each of the trackers) wore one (randomly assigned) tracker and a research-grade activity monitor ActiGraph wGT3X-BT simultaneously for six consecutive days. Both Garmin trackers showed excellent performance for step counts, with a mean absolute percentage error (MAPE) below 20% and intraclass correlation coefficient (ICC2,1) above 0.90 (p < 0.05). The MAPE for sleep time was within 10% for all the trackers tested, while it was far beyond 20% for all other movement behaviors metrics. The results suggested that all three trackers could be used for measuring sleep time with a high level of accuracy, and both Garmin trackers could also be used for step counts. All other output metrics should be used with caution. The results provided in this study could be used to guide choice on activity trackers aiming for different purposes—individual use, longitudinal monitoring or in clinical trial setting.

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Comparison of Step Count Assessed Using Wrist- and Hip-Worn Actigraph GT3X in Free-Living Conditions in Young and Older Adults

Frontiers in Medicine ◽

10.3389/fmed.2019.00252 ◽

2019 ◽

Vol 6 ◽

Cited By ~ 3

Author(s):

Stephane Mandigout ◽

Justine Lacroix ◽

Anaick Perrochon ◽

Zdenek Svoboda ◽

Timothee Aubourg ◽

...

Keyword(s):

Older Adults ◽

Living Conditions ◽

Step Count ◽

Free Living ◽

Free Living Conditions

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Accuracy of uploadable pedometers in laboratory, overground, and free-living conditions in young and older adults

International Journal of Behavioral Nutrition and Physical Activity ◽

10.1186/1479-5868-9-143 ◽

2012 ◽

Vol 9 (1) ◽

pp. 143 ◽

Cited By ~ 20

Author(s):

Christopher J Dondzila ◽

Ann M Swartz ◽

Nora E Miller ◽

Elizabeth K Lenz ◽

Scott J Strath

Keyword(s):

Older Adults ◽

Living Conditions ◽

Free Living ◽

Free Living Conditions

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

Journal of Aging and Physical Activity ◽

10.1123/japa.2016-0344 ◽

2018 ◽

Vol 26 (1) ◽

pp. 128-135 ◽

Cited By ~ 22

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

Frontiers in Medicine ◽

10.3389/fmed.2021.696968 ◽

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.

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