Accuracy and Precision of the SlateSafety BandV2 and CORE Devices in Estimating Resting and Moderate Hyperthermic Exercise Temperature in Eumenorrheic Females.

Purpose: Core temperature (Tcore) monitoring is used in the prevention of heat illnesses and for heat-acclimation purposes. We examined the accuracy and precision of 2 commercially available devices (BandV2 and CORE) that estimate Tcore versus rectal temperature.

Method: Eight eumenorrheic females (V˙O2max: ∼41 mL·kg-1·min-1) completed 60 minutes of cycling in the follicular phase and the luteal phase over 2 separate cycles, wearing a minimally permeable clothing ensemble to amplify thermal load.

Results: Both devices proved to be precise at rest and during exercise. Between duplicate follicular and luteal tests, the CORE device bias was 0.1400 (0.33) °C and 0.0331 (0.42) °C, and the BandV2 device bias was 0.0418 (0.18) °C and -0.0171 (0.21) °C. Compared with rectal temperature, accuracy was below our preestablished criterion of ±0.27 °C. At rest, the devices underestimated Tcore: BandV2, -0.2735 (0.25) °C, and CORE, -0.2746 (0.28) °C, and at the 55-minute time point, both devices overestimated Tcore: BandV2, +0.5117 (0.37) °C, and CORE, +0.3319 (0.43) °C. The delta increase in Tcore did not differ between menstrual-cycle phases.

Conclusions: The BandV2 and CORE indirect sensors currently offer precise but not accurate estimates of Tcore.