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The purpose of this study was to determine the intrasession and intersession reliability of Zephyr Bioharness (ZB) and Fitbit Charge variables in both healthy men and women at rest, during the Modified Canadian Aerobic Fitness Test (mCAFT), and throughout recovery. Stratified convenience and snowball sampling were used to recruit 60 participants (30 women, 48 ± 15 years) and (30 men, 48 ± 15 years) from McMaster University student, staff, and faculty population. At rest, intrasession average heart rate (b·min-1). Intraclass correlation coefficients (ICCs) and Standard Error of Measurement [SEM] for Zephyr ranged from (0.94–0.97) [1.17–1.70] to (0.92–0.97) [1.45–2.10] for Fitbit Charge. During the mCAFT, the Zephyr ICCs and (SEM) ranged from 0.31–0.99 (1.28–8.10) to 0.45–0.99 (1.45–8.71) for the Fitbit Charge. Throughout the recovery, the ICCs and (SEM) ranged from 0.44–0.98 (1.26–10.47) to 0.45–0.98 (1.15–11.90) for Zephyr and Fitbit devices, respectively. At rest, intersession ICCs (SEM) for Zephyr and Fitbit ranged from 0.90–0.94 (1.73–2.37) to 0.88–0.94 (1.83–2.67), respectively. At mCAFT, the Zephyr ICCs (SEM) ranged from 0.91–0.97 (3.12–4.64) to 0.85–0.98 (3.28–4.88) for the Fitbit. Throughout the recovery, the ICCs (SEM) ranged from 0.93–0.97 (2.65–4.66) to 0.76–0.91 (3.17–4.67) for Zephyr and Fitbit devices, respectively. To conclude, both the ZB and Fitbit Charge devices demonstrated excellent reliability measures throughout the 3 phases. The findings from our study add to the existing pool of literature regarding the reliability parameters of wearable devices and suggest that stable and consistent measures of heart rate and physical activity can be obtained using ZB and Fitbit Charge devices among healthy male and female participants at rest, during a standardized submaximal fitness test (mCAFT), and throughout recovery.
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