Apple uses a novel Hardware prototype Sleep band along with Apple Watch in a new study

Apple has completed the clinical trial for Cycle and Ovulation study expansion. The records were updated this week on the Govt. Clinical trials site.

This study is separate from Apple’s Women’s Health Study, conducted with the Harvard T.H. Chan School of Public Health and the National Institute of Environmental Health Sciences (NIEHS). This specific Ovulation and cycle expansion study was sponsored by Apple in collaboration with Exponent.

The Cycle and Ovulation Study Expansion trials started in 2021 and were completed last year. The records on the gov. database were updated this week and mention a ‘ hardware prototype wrist-worn sleep band”.

Apple Sleep Band Women health
Prototype sleep band used in the study.

The objective of this study was to collect menstrual cycle, health sensor data and general health information to understand correlations between menstrual cycle and health sensor data, and how those correlations may be affected by general health.

Here are the major key dates of this clinical study:

key dates of the study

698 Participants entered menstrual cycle information (such as start dates, end dates, symptoms, flow), basal body temperature as measured by a thermometer, and ovulation and progesterone test results via apps installed on their iPhone. 

The study was completed in Phoenix, Arizona and spearheaded by Bo Qing from Exponent. He is a Biomedical engineering and sciences consultant.

Apple ovulation expansion study

Additionally, participants were provided with an Apple Watch and a wrist-worn hardware prototype wrist-worn sleep band to collect physiological sensor data. 

Both menstrual cycle information and physiological sensor data stored on the participants’ iPhone prior to enrolling in the study (up to 18 months) was also collected. This study aimed to collect data from females aged 14 and older who are currently menstruating with irregular and regular menstrual cycles.

These trials were run in partnership with Exponent, an Engg. and research company with expertise in health sciences and human factors.

Most likely, the hardware wrist-worn sleep band is a lab control testing device. That being said, one wouldn’t be surprised if Apple develops a minimalistic sleep band. The problem with this assumption is that it will likely cannibalize Apple Watch sales.

When govt. records start getting updated a few weeks prior to WWDC; it is worth taking a deeper look 🙂

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Sudz Niel Kar
I am a technologist with years of experience with Apple and wearOS products, have a BS in Computer Science and an MBA specializing in emerging tech, and owned the popular site AppleToolBox. In my day job, I advise Fortune 500 companies with their digital transformation strategies and also consult with numerous digital health startups in an advisory capacity. I'm VERY interested in exploring the digital health and fitness-tech evolution and keeping a close eye on patents, FDA approvals, strategic partnerships, and developments happening in the wearables and digital health sector. When I'm not writing or presenting, I run with my Apple Watch Ultra or Samsung Galaxy Watch and closely monitor my HRV and other recovery metrics.


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