Abstract
Background: The aim of this study was to analyse the validity and accuracy of the low-cost Xiaomi Mi Band 4 (MB4) fitness tracker in relation to step count and heart rate in free-living conditions. Methods: 46 participants join in this study (38.65 ± 14.36 years old). The MB4 was compared with a video recording in laboratory conditions, also with the Sense Wear and Firstbeat monitors in free-living conditions. Results: No significant differences were found in the number of steps in the laboratory protocol between devices, in both, at low and high walking speed. For the free-living conditions, the MB4 showed high values of convergent validity in relation to the Firstbeat monitor during recording in both rest and walking situations. Moreover, the MB4 showed adequate values of convergent validity with the Sense Wear monitor during the 24 h recording, at medium speeds, and climbing stairs. Conclusion: The accuracy and precision of the MB4 is reasonable and can be used to monitor the average of step count and heart rate in free-living conditions.
Highlights
Physical inactivity is one of the major health problems in developed societies, and the fourth leading risk factor for global mortality [1]
Technological advances enable the quantifying of physical activity (PA) levels at a reduced cost due to the development of wearables and health applications, which have increased in both variety and quality [5,6]
27 men and 19 women The inclusion criteria were that the individuals: a) did not have any physical limitation that prevented them from performing the validation protocol; b) did not have any treatment that could disrupt the cognitive and physical functions needed to understand the instruction
Summary
Physical inactivity is one of the major health problems in developed societies, and the fourth leading risk factor for global mortality [1]. To quantify daily PA, selfreporting has been a useful method for registering it. On the contrary, assessing PA using a valid device such as a pedometer is associated with a lower risk of all-cause mortality, with step count (SC) considered an effective way to achieve PA recommendations in adults since it is a simple, economical, and easy method for reaching these recommendations [4]. Technological advances enable the quantifying of PA levels at a reduced cost due to the development of wearables and health applications, which have increased in both variety and quality [5,6]. Xiaomi Mi Band 4 (MB4) fitness tracker in relation to step count and heart rate in free-living conditions
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