Abstract
This study aimed to verify the validity of sleep measurement using the MOTHER Bracelet®, a commercially available activity tracker that does not require recharging, by comparing its performance with that of standard research-use actigraphy (wGT3X-BT). Over the course of seven consecutive nights, six healthy participants (five males and one female) wore both devices simultaneously to collect sleep data. Total Sleep Time (TST), Wake After Sleep Onset (WASO), Sleep Efficiency (SE), and sleep/wake determination for each epoch were analyzed. According to the Bland-Altman analysis, the MOTHER Bracelet® tended to overestimate TST by 18.29 minutes, underestimate WASO by 34.45 minutes, and overestimate SE by 4.33% when compared to the wGT3X-BT. Additionally, the MOTHER Bracelet® showed high sensitivity (94.4%) and low specificity (21.2%), with an accuracy of 85.9% using the wGT3X-BT as the ground truth. Furthermore, TST showed a significantly high correlation between the two devices (r=0.8483; P<0.01). While the results were partially consistent with the wGT3X-BT, the MOTHER Bracelet® shows considerable promise as a convenient tool for assessing habitual sleep. Future studies comparing its performance with polysomnography may further confirm its effectiveness as a sleep measurement tool.
