Stanford Sleep Study Finds Huami Smartwatch Provides Clinical-Grade Accuracy

Amazfit Arc Tracks and Detects Sleep Phases Better Than $1,000

MOUNTAIN VIEW, Calif.–(BUSINESS WIRE)–lt;a href=”” target=”_blank”gt;#amazfitlt;/agt;–Huami, the second largest wearables company globally1,
announced today the results of its wearable device sleep study with
Stanford University Center for Sleep Sciences and Medicine, which
conducts research and clinical and educational programs to improve
patient care. According to the results of the study, Huami’s Amazfit
, a consumer wearable device, tracks sleep and wake periods with
better accuracy than a commonly used clinical-grade actigraph,
suggesting that Arc is a cost-effective research alternative for
large-scale, clinical studies and trials.

Researchers studied minute-by-minute activity data collected from two
different wearables — Amazfit Arc and Actiwatch Spectrum by Philips —
which were worn by 31 participants over a 48-hour period. Twelve
participants had no significant health issues or sleep disorders and the
remaining 19 participants were patients from the Stanford University
sleep clinic. Time-stamped data from each participant was recorded and
compared. Researchers concluded that Arc and Actiwatch data were highly
correlated, with the Arc yielding fundamentally similar sleep scoring
metrics as to Actiwatch.

“Actigraphs are widely used portable wrist-worn devices that record the
amount and timing of a person’s sleep and wake, but their clinical use
is highly limited by their expense,” said Elaine Huo, Head of U.S.
Marketing for Huami. “Until now, there was a lack of independent
validation for cost-effective research alternatives. This study is the
first of its kind to prove that a consumer wearable device can be used
as an actigraph for sleep monitoring and that Amazfit Arc is able to
produce data comparable to a research-grade actigraph.”

Additional Study Highlights

  • The auto- and low-scoring settings on the Actiwatch software
    (Actiware) were used to determine sleep and wake from the Actiwatch
    data and were used as the comparators.
  • Receiver operating characteristic curves were used to optimize the
    relationship between the devices.
  • Minute-by-minute Arc and Actiwatch data were highly correlated (r =
    0.94, Spearman correlation) over the 48-h study period.
  • Treating the Actiwatch auto scoring as the gold standard for
    determination of sleep and wake, Arc has an overall accuracy of 99.0%
    ± 0.17% (SEM), a sensitivity of 99.4% ± 0.19%, and a specificity of
    84.5% ± 1.9% for the determination of sleep.
  • As compared to the Actiwatch low scoring, Arc has an overall accuracy
    of 95.2% ± 0.36%, a sensitivity of 95.7% ± 0.47%, and a specificity of
    91.7% ± 0.60% for the determination of sleep.

“We are pleased to provide researchers worldwide with an opportunity to
advance the field of sleep study like never before and to offer
consumers medical-grade data accuracy for less than $70 USD,” added Huo.
“The promising results of the Stanford sleep study is another
significant milestone for Huami and largely confirms what users and
reviewers have been touting from the beginning — that Amazfit offers the
best low-key casual smartwatch
around at a remarkable bargain, just
like the Casio
of the 21st century

For more information about the wearable device sleep study with Stanford
University Center for Sleep Sciences and Medicine and Huami, visit the
report: Validation
of minute-to-minute scoring for sleep and wake periods in a consumer
wearable device compared to an actigraphy device

About Huami

Huami is a biometric and activity data-driven company with significant
expertise in smart wearable technology. Since its inception in 2013,
Huami has quickly established its global market leadership and
recognition by shipping millions of smart wearable devices. In 2017,
Huami shipped 18.1 Million units of smart wearable devices, more than
any other company in the world, according to Frost & Sullivan. Huami
owns a large biometric and activity database in the global smart
wearables industry. Huami’s mobile apps, Mi Fit and Amazfit, collect
over ten dimensions of measurement including heart rate,
electrocardiogram data, weight, body fat compositions, GPS running
track, steps, sleeping duration, and more. Huami’s mobile apps work hand
in hand with its smart wearable devices and provide users with a
comprehensive view and analysis of their data. With a wide range of data
from a large number of users, Huami is well-positioned to develop new
application scenarios for smart wearable technology and drive
innovation. Huami has been the sole partner of Xiaomi, a leading mobile
internet company and global consumer electronics brand, to design and
manufacture Xiaomi-branded smart bands, watches (excluding children
watches and quartz watches), scales and associated accessories,
including the Mi Band series.

For more information please visit

1 IDC Worldwide Quarterly Wearable Device Tracker Q2/2018


Jennifer Pierce
Media Relations for Huami US
[email protected]

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