Sports Medicine, Mayo Clinic Health System, Onalaska, WI, USA -
Exercise and Sport Science Department, University of Wisconsin La Crosse, La Crosse, WI, USA -
J Sports Med Phys Fitness. 2021 Feb;61(2):205-211. doi: 10.23736/S0022-4707.20.11151-4. Epub 2020 Jul 28.
As new technology emerges and updated fitness watches are released to the market, it is important to examine their accuracy. The aim of the current study was to examine the accuracy of three commercially available activity trackers in assessing heart rate (HR) and energy expenditure (EE) during moderate intensity exercise.
Twenty healthy participants (Age: 20.5±0.7 yrs., Ht: 173.4±10.8 cm, BM: 72.8±13.9 kg, BMI: 24.0±2.5 kg/m) wore two fitness watches (FB: Fitbit Versa, San Francisco, CA, USA; and PI: Polar Ignite, Polar Electro Oy, Kempele, Finland) and a chest-worn HR monitor (PTP: Polar TeamPro Sensor, Polar Electro) during a 12-minute exercise protocol at incremental speeds. An electrocardiogram (ECG) and indirect calorimetry were used as criterion measures for HR and EE. Mean absolute percentage error (MAPE) was calculated to determine measurement error.
The MAPE values for HR were 11.6±8.7% for the FB, 11.0±10.0% for the PI, and 6.3±5.2% for the PTP. For EE, MAPE values were 9.6±7.2% for the FB, 16.7±19.6% for the PI and 13.8±13.0% for the PTP.
Fitness watches relying on optical measures of HR underestimate HR compared to criterion measures during moderate intensity exercise. Despite providing a more accurate measure of HR, a chest-worn monitor does not provide a more accurate estimate of EE compared to fitness watches. The Fitbit provided the most accurate measure of EE when compared to the Polar Ignite watch and chest-worn device.
随着新技术的出现和更新的健身追踪器投放市场，检查其准确性很重要。本研究旨在检查三种市售活动追踪器在评估中等强度运动中心率（HR）和能量消耗（EE）时的准确性。
20 名健康参与者（年龄：20.5±0.7 岁，身高：173.4±10.8 厘米，体重：72.8±13.9 千克，BMI：24.0±2.5 千克/米）在 12 分钟的递增速度运动方案中佩戴两块健身追踪器（FB：Fitbit Versa，旧金山，CA，美国；PI：Polar Ignite，Polar Electro Oy，Kempele，芬兰）和一个胸部佩戴的 HR 监测器（PTP：Polar TeamPro 传感器，Polar Electro）。心电图（ECG）和间接量热法被用作 HR 和 EE 的标准测量。平均绝对百分比误差（MAPE）用于确定测量误差。
FB 的 HR MAPE 值为 11.6±8.7%，PI 的 MAPE 值为 11.0±10.0%，PTP 的 MAPE 值为 6.3±5.2%。对于 EE，FB 的 MAPE 值为 9.6±7.2%，PI 的 MAPE 值为 16.7±19.6%，PTP 的 MAPE 值为 13.8±13.0%。
在中等强度运动中，依赖于 HR 光学测量的健身追踪器与标准测量相比低估了 HR。尽管提供了更准确的 HR 测量，但与健身追踪器相比，胸部佩戴的监测器并不能更准确地估计 EE。与 Polar Ignite 手表和胸部佩戴设备相比，Fitbit 提供了最准确的 EE 测量值。
