Date of Completion

2019

Document Type

Honors College Thesis

Department

Rehabilitation and Movement Science

Thesis Type

Honors College

First Advisor

Dr. Yang Bai

Second Advisor

Dr. Susan Kasser

Third Advisor

Dr. Connie Tompkins

Keywords

Physical Activity Monitors, Fitbit Charge 2, Apple iWatch, Free-Living, Heart Rate Measurement

Abstract

The purpose of this investigation was to investigate the validity of heart rate (HR) measurements in Fitbit Charge 2 (FBC2) and Apple iWatch (AW). Fifty-two healthy adults wore 7 activity monitors while engaging in a normal daily activity free-living data collection for a twenty-four-hour period. HR criterion measures were collected by a Polar H7 HR chest strap monitor. For estimating whole-HR validity, the mean absolute percent errors were smaller in magnitude for sedentary behavior, moderate physical activity, and vigorous physical activity for the FBC2 (4%, 10%, 14%) compared to the AW (7%, 10%, 16%). Bland-Altman analysis revealed both FBC2 and AW tended to underestimate HR measurement values. FBC2 was considered in agreement for sedentary behavior and moderate intensity physical activity. To a lesser degree, AW was considered in agreement for sedentary behavior and moderate intensity physical activity. Both FBC2 and AW had a weak-moderate correlation for vigorous intensity physical activity (rFBC2=0.49, p= <0.0001 and rAW=0.49, p=<0.0001). The FBC2 and AW should be used with caution, however they have reasonable validity for tracking general exercise behavior in the adult consumer population. The FBC2 and AW should not be used interchangeably with laboratory gold standards in a research capacity.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License.

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