%0 Journal Article
%@ 2561-1011
%I JMIR Publications
%V 6
%N 1
%P e31501
%T The Effect of Wearable Tracking Devices on Cardiorespiratory Fitness Among Inactive Adults: Crossover Study
%A Larsen,Lisbeth Hoejkjaer
%A Lauritzen,Maja Hedegaard
%A Sinkjaer,Mikkel
%A Kjaer,Troels W
%+ Department of Neurology, Zealand University Hospital, Sygehusvej 10, Roskilde, 4000, Denmark, 45 41558592, lisbla@regionsjaelland.dk
%K activity tracking
%K cardiorespiratory fitness
%K mHealth
%K mobile health
%K motivation
%K physical activity
%K self-monitoring
%K wearable
%K cardio
%K fitness
%K cardiorespiratory
%K behavior change
%D 2022
%7 15.3.2022
%9 Original Paper
%J JMIR Cardio
%G English
%X Background: Modern lifestyle is associated with a high prevalence of physical inactivity. Objective: This study aims to investigate the effect of a wearable tracking device on cardiorespiratory fitness among inactive adults and to explore if personal characteristics and health outcomes can predict adoption of the device. Methods: In total, 62 inactive adults were recruited for this study. A control period (4 weeks) was followed by an intervention period (8 weeks) where participants were instructed to register and follow their physical activity (PA) behavior on a wrist-worn tracking device. Data collected included estimated cardiorespiratory fitness, body composition, blood pressure, perceived stress levels, and self-reported adoption of using the tracking device. Results: In total, 50 participants completed the study (mean age 48, SD 13 years, 84% women). Relative to the control period, participants increased cardiorespiratory fitness by 1.52 mL/kg/minute (95% CI 0.82-2.22; P<.001), self-reported PA by 140 minutes per week (95% CI 93.3-187.1; P<.001), daily step count by 982 (95% CI 492-1471; P<.001), and participants’ fat percentage decreased by 0.48% (95% CI –0.84 to –0.13; P=.009). No difference was observed in blood pressure (systolic: 95% CI –2.16 to 3.57, P=.63; diastolic: 95% CI –0.70 to 2.55; P=.27) or perceived stress (95% CI –0.86 to 1.78; P=.49). No associations were found between adoption of the wearable tracking device and age, gender, personality, or education. However, participants with a low perceived stress at baseline were more likely to rate the use of a wearable tracking device highly motivating. Conclusions: Tracking health behavior using a wearable tracking device increases PA resulting in an improved cardiorespiratory fitness among inactive adults. 
%M 35289763
%R 10.2196/31501
%U https://cardio.jmir.org/2022/1/e31501
%U https://doi.org/10.2196/31501
%U http://www.ncbi.nlm.nih.gov/pubmed/35289763