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Estimating physical activity and sedentary behaviour in a free-living environment: A comparative study between Fitbit Charge 2 and Actigraph GT3X

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Mikkelsen, Marie-Louise K ; Berg-Beckhoff, Gabriele ; Frederiksen, Peder ; Horgan, Graham ; O'Driscoll, Ruairi ; Palmeira, António L ; Scott, Sarah E ; Stubbs, James ; Heitmann, Berit L ; Larsen, Sofus C. / Estimating physical activity and sedentary behaviour in a free-living environment : A comparative study between Fitbit Charge 2 and Actigraph GT3X. I: PLoS One. 2020 ; Bind 15, Nr. 6 June. s. e0234426.

Bibtex

@article{3c497e979d19460ba5575ed8473bf1d5,
title = "Estimating physical activity and sedentary behaviour in a free-living environment: A comparative study between Fitbit Charge 2 and Actigraph GT3X",
abstract = "BACKGROUND: Activity trackers such as the Fitbit Charge 2 enable users and researchers to monitor physical activity in daily life, which could be beneficial for changing behaviour. However, the accuracy of the Fitbit Charge 2 in a free-living environment is largely unknown.OBJECTIVE: To investigate the agreement between Fitbit Charge 2 and ActiGraph GT3X for the estimation of steps, energy expenditure, time in sedentary behaviour, and light and moderate-to-vigorous physical activity under free-living conditions, and further examine to what extent placing the ActiGraph on the wrist as opposed to the hip would affect the findings.METHODS: 41 adults (n = 10 males, n = 31 females) were asked to wear a Fitbit Charge 2 device and two ActiGraph GT3X devices (one on the hip and one on the wrist) for seven consecutive days and fill out a log of wear times. Agreement was assessed through Bland-Altman plots combined with multilevel analysis.RESULTS: The Fitbit measured 1,492 steps/day more than the hip-worn ActiGraph (limits of agreement [LoA] = -2,250; 5,234), while for sedentary time, it measured 25 min/day less (LoA = -137; 87). Both Bland-Altman plots showed fixed bias. For time in light physical activity, the Fitbit measured 59 min/day more (LoA = -52;169). For time in moderate-to-vigorous physical activity, the Fitbit measured 31 min/day less (LoA = -132; 71) and for activity energy expenditure it measured 408 kcal/day more than the hip-worn ActiGraph (LoA = -385; 1,200). For the two latter outputs, the plots indicated proportional bias. Similar or more pronounced discrepancies, mostly in opposite direction, appeared when comparing to the wrist-worn ActiGraph.CONCLUSION: Moderate to substantial differences between devices were found for most outputs, which could be due to differences in algorithms. Caution should be taken if replacing one device with another and when comparing results.",
keywords = "Accelerometry/instrumentation, Adult, Energy Metabolism/physiology, Exercise/physiology, Female, Fitness Trackers, Humans, Male, Middle Aged, Monitoring, Ambulatory/instrumentation, Reproducibility of Results, Sedentary Behavior",
author = "Mikkelsen, {Marie-Louise K} and Gabriele Berg-Beckhoff and Peder Frederiksen and Graham Horgan and Ruairi O'Driscoll and Palmeira, {Ant{\'o}nio L} and Scott, {Sarah E} and James Stubbs and Heitmann, {Berit L} and Larsen, {Sofus C}",
year = "2020",
month = jun,
doi = "10.1371/journal.pone.0234426",
language = "English",
volume = "15",
pages = "e0234426",
journal = "PLOS ONE",
issn = "1932-6203",
publisher = "Public Library of Science",
number = "6 June",

}

RIS

TY - JOUR

T1 - Estimating physical activity and sedentary behaviour in a free-living environment

T2 - A comparative study between Fitbit Charge 2 and Actigraph GT3X

AU - Mikkelsen, Marie-Louise K

AU - Berg-Beckhoff, Gabriele

AU - Frederiksen, Peder

AU - Horgan, Graham

AU - O'Driscoll, Ruairi

AU - Palmeira, António L

AU - Scott, Sarah E

AU - Stubbs, James

AU - Heitmann, Berit L

AU - Larsen, Sofus C

PY - 2020/6

Y1 - 2020/6

N2 - BACKGROUND: Activity trackers such as the Fitbit Charge 2 enable users and researchers to monitor physical activity in daily life, which could be beneficial for changing behaviour. However, the accuracy of the Fitbit Charge 2 in a free-living environment is largely unknown.OBJECTIVE: To investigate the agreement between Fitbit Charge 2 and ActiGraph GT3X for the estimation of steps, energy expenditure, time in sedentary behaviour, and light and moderate-to-vigorous physical activity under free-living conditions, and further examine to what extent placing the ActiGraph on the wrist as opposed to the hip would affect the findings.METHODS: 41 adults (n = 10 males, n = 31 females) were asked to wear a Fitbit Charge 2 device and two ActiGraph GT3X devices (one on the hip and one on the wrist) for seven consecutive days and fill out a log of wear times. Agreement was assessed through Bland-Altman plots combined with multilevel analysis.RESULTS: The Fitbit measured 1,492 steps/day more than the hip-worn ActiGraph (limits of agreement [LoA] = -2,250; 5,234), while for sedentary time, it measured 25 min/day less (LoA = -137; 87). Both Bland-Altman plots showed fixed bias. For time in light physical activity, the Fitbit measured 59 min/day more (LoA = -52;169). For time in moderate-to-vigorous physical activity, the Fitbit measured 31 min/day less (LoA = -132; 71) and for activity energy expenditure it measured 408 kcal/day more than the hip-worn ActiGraph (LoA = -385; 1,200). For the two latter outputs, the plots indicated proportional bias. Similar or more pronounced discrepancies, mostly in opposite direction, appeared when comparing to the wrist-worn ActiGraph.CONCLUSION: Moderate to substantial differences between devices were found for most outputs, which could be due to differences in algorithms. Caution should be taken if replacing one device with another and when comparing results.

AB - BACKGROUND: Activity trackers such as the Fitbit Charge 2 enable users and researchers to monitor physical activity in daily life, which could be beneficial for changing behaviour. However, the accuracy of the Fitbit Charge 2 in a free-living environment is largely unknown.OBJECTIVE: To investigate the agreement between Fitbit Charge 2 and ActiGraph GT3X for the estimation of steps, energy expenditure, time in sedentary behaviour, and light and moderate-to-vigorous physical activity under free-living conditions, and further examine to what extent placing the ActiGraph on the wrist as opposed to the hip would affect the findings.METHODS: 41 adults (n = 10 males, n = 31 females) were asked to wear a Fitbit Charge 2 device and two ActiGraph GT3X devices (one on the hip and one on the wrist) for seven consecutive days and fill out a log of wear times. Agreement was assessed through Bland-Altman plots combined with multilevel analysis.RESULTS: The Fitbit measured 1,492 steps/day more than the hip-worn ActiGraph (limits of agreement [LoA] = -2,250; 5,234), while for sedentary time, it measured 25 min/day less (LoA = -137; 87). Both Bland-Altman plots showed fixed bias. For time in light physical activity, the Fitbit measured 59 min/day more (LoA = -52;169). For time in moderate-to-vigorous physical activity, the Fitbit measured 31 min/day less (LoA = -132; 71) and for activity energy expenditure it measured 408 kcal/day more than the hip-worn ActiGraph (LoA = -385; 1,200). For the two latter outputs, the plots indicated proportional bias. Similar or more pronounced discrepancies, mostly in opposite direction, appeared when comparing to the wrist-worn ActiGraph.CONCLUSION: Moderate to substantial differences between devices were found for most outputs, which could be due to differences in algorithms. Caution should be taken if replacing one device with another and when comparing results.

KW - Accelerometry/instrumentation

KW - Adult

KW - Energy Metabolism/physiology

KW - Exercise/physiology

KW - Female

KW - Fitness Trackers

KW - Humans

KW - Male

KW - Middle Aged

KW - Monitoring, Ambulatory/instrumentation

KW - Reproducibility of Results

KW - Sedentary Behavior

UR - http://www.scopus.com/inward/record.url?scp=85086354157&partnerID=8YFLogxK

U2 - 10.1371/journal.pone.0234426

DO - 10.1371/journal.pone.0234426

M3 - Journal article

C2 - 32525912

VL - 15

SP - e0234426

JO - PLOS ONE

JF - PLOS ONE

SN - 1932-6203

IS - 6 June

M1 - e0234426

ER -

ID: 61192974