Concurrent Validity of Wearable Activity Trackers Under Free-Living Conditions

Abstract

Brooke, SM, An, H-S, Kang, S-K, Noble, JM, Berg, KE, and Lee, J-M. Concurrent validity of wearable activity trackers under free-living conditions. J Strength Cond Res 31(4): 1097-1106, 2017-The purpose of this study is to evaluate the concurrent validity of wearable activity trackers in energy expenditure (EE) and sleep period time (SPT) under free-living conditions. Ninety-five (28.5 ± 9.8 years) healthy men (n = 34) and women (n = 61) participated in this study. The total EE and SPT were measured using 8 monitors: Nike+ FuelBand SE (NFB), Garmin VivoFit (VF), Misfit Shine (MF), Fitbit Flex (FF), Jawbone UP (JU), Polar Loop (PL), Fitbit Charge HR (FC), and SenseWear Armband Mini (SWA) (criterion measures: SWA for EE and a sleep log for SPT). The mean absolute percent error (MAPE) for EE was 13.0, 15.2, 15.5, 16.1, 16.2, 22.8, and 24.5% for PL, MF, FF, NFB, FC, JU, and VF, respectively. Mean absolute percent errors were calculated for SPT to be 4.0, 8.8, 10.2, 11.5, 12.9, 13.6, 17.5, and 21.61% for VF, FF, JU, FC, MF, SWA laying down, PL, and SWA, respectively. Concurrent validity was examined using equivalence testing on EE (equivalence zone: 2,889.7-3,531.9 kcal); 2 trackers fell short of falling in the zone: PL (2,714.4-3,164.8 kcal) and FC (2,473.8-3,066.5 kcal). For SPT (equivalence zone: 420.6-514.0 minutes), several monitors fell in the zone: PL (448.3-485.6 minutes), MS (442.8-492.2 minutes), and FF (427.7-486.7 minutes). This study suggests that the PL and FC provide a reasonable estimate of EE under free-living conditions. The PL, FC, and MF were the most valid monitors used for measuring SPT.

Impact of Volume and Type of Overnight Pages on Resident Sleep During Home Call

“…These devices have been shown to have accuracy comparable to commercial actigraphy systems. 6,7 We hypothesized that residents get less sleep on call nights, and even less on nights when they subsequently report they feel too fatigued to perform their duties safely. We also hypothesized that residents would sleep less with increasing call volume, and that the difference would be larger for pages about unfamiliar patients.…”

Wearable sensors: can they benefit patients with chronic kidney disease?

“…Satellite navigation on cell-phones allows precise walking/running track recording, etc. There are numerous (commercial) activity trackers available which are validated by multiple studies [82][83][84][85][86] such as the SenseWear armband ® (BodyMedia Inc., Pittsburgh, PA, USA), Fitbit ® (Fitbit Inc., San Francisco, CA, USA), Garmin activity trackers (Garmin, Olathe, KS, USA), Jawbone (San Francisco, CA, USA), and many more. Although recent research showed that all these monitors did have error ranges in free-living conditions [82][83][84], it is also suggested that these activity trackers can offer an opportunity to stimulate health, fitness, and quality of life [82,87], particularly when used for consumer-based self-monitoring to encourage behavioral changes [85].…”

“…There are numerous (commercial) activity trackers available which are validated by multiple studies [82][83][84][85][86] such as the SenseWear armband ® (BodyMedia Inc., Pittsburgh, PA, USA), Fitbit ® (Fitbit Inc., San Francisco, CA, USA), Garmin activity trackers (Garmin, Olathe, KS, USA), Jawbone (San Francisco, CA, USA), and many more. Although recent research showed that all these monitors did have error ranges in free-living conditions [82][83][84], it is also suggested that these activity trackers can offer an opportunity to stimulate health, fitness, and quality of life [82,87], particularly when used for consumer-based self-monitoring to encourage behavioral changes [85]. Various studies have used and validated activity trackers to measure PA in both healthy controls [88,89] and CKD patients [90][91][92] and showed that this objective measure is more accurate than self-reported PA by questionnaires, which often over-or underestimates a patients' PA level [93].…”

P58 Development of JUNIORMED – the Austrian paediatric pharmacopoeia

“…Introduction Wearable activity trackers are increasingly incorporated into daily life and are advancing in their technology in means of accuracy, validity and acceptability, [1][2][3][4][5][6] however there is deficient knowledge on using these devices in a paediatric setting. The objective of this pilot study was to assess the feasibility of physical activity tracking in children 7 before and after a standardized surgical intervention and to assess the recovery time after surgery.…”