Welcome to Ava

Get the App
Read the User Manual

Set up your Ava

Attach the sensor pod to the bracelet

Attach the sensor pod to the bracelet by aligning front of the pod with the wrist side of the band and pressing it into the strap.

Charge & Pair Ava

Plug Ava in to charge. After you set up your account in the app, follow the instructions on the screen to pair.

Sync Ava every morning

When you wake up in the morning, take off the bracelet and connect it to the USB cable. Open the Ava app and syncing should begin automatically.

Be consistent

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Ava is most accurate when you wear it every night, and sync it every morning.

Always add your period

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For accurate results, it’s important to enter your period into the app every month

Wear Ava on the same wrist

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Wear Ava snugly on the same wrist each night.

What Ava Measures

Pulse rate is an accurate estimation of how often your heart beats per minute (bpm). Typical resting pulse rates for adults are between 40 and 80 bpm, but if you get a lot of aerobic exercise, your resting pulse rate may be lower.
The temperature of your skin at your wrist. Even though your wrist skin temperature reading is lower than your oral temperature reading, it still provides a strong indication of your basal body temperature (BBT). During the night, your wrist skin temperature rises and your core body temperature falls. Both your core temperature and your wrist skin temperature rise by about one half of one degree Fahrenheit after ovulation.

Average skin temperature reading (when taken at room temperature of 64.5 – 77 degrees Fahrenheit) are between 90.68 and 98.24 degrees Fahrenheit. If you sleep in a room warmer than 77 degrees Fahrenheit, it could cause your skin temperature to go up.

HRV is the variation in the time interval from one heartbeat to the next. It can be used as an indicator of physiological stress.

Most people think of heart rate as the average number of beats per minute, but your heart rate changes from beat to beat. HRV measures this naturally occurring irregularity in heart rate. The more variation in the interval between beats, the lower your physiological stress level.

Ava measures the ratio between low frequency and high frequency waves in your heart rate. Scientific studies have shown that the HRV ratio is a good indicator to assess the balance between the sympathetic nervous system and the parasympathetic nervous system. An imbalance in these systems—usually when the sympathetic branch takes the upper hand—is associated with high physiological stress level and results in a high HRV ratio.

Estrogen and progesterone have an impact on HRV. The HRV ratio is increased during the luteal phase when progesterone peaks, compared with the follicular phase, when estrogen is high.

Normal HRV ratio varies widely from person to person, but by looking for an increase or decrease from your baseline HRV ratio, you can learn about your body’s physiological stress level. HRV ratio is complicated, but the important thing to remember that a higher HRV ratio indicates higher stress.

The quality and amount of sleep you’re getting each night are important parameters to track for your fertility. Your menstrual cycle can affect your sleep, and your sleep, in turn, can affect your menstrual cycle. Ava shows the total amount of sleep you get each night. This doesn’t count time you might spend reading in bed; the bracelet can distinguish between sleeping and lying quietly. It also tracks the percentage of light sleep and the percentage of combined deep and REM sleep.

Average percentages for adults are 47 – 60 percent light sleep and 33 – 48 percent deep sleep + REM.

Rate of respiration per minute.
Ava tracks your movement with an accelerometer. This parameter allows the bracelet distinguish between light and deep + REM sleep.
Perfusion describes the process of supplying blood to the tissues of your body. As blood flows through your capillaries, it delivers nutrients to the tissues and helps sweep away waste. Then, the blood flows back to the heart, and begins the process all over again.

If you’ve ever had an elastic band around your finger and felt the blood flow being cut off, you’re already familiar with the process of perfusion. While you can limit perfusion with an elastic band, perfusion can also change naturally for different reasons. For example, your perfusion changes in order to keep you warm or cool you down. Estrogen and progesterone also have an influence on perfusion. Estrogen increases perfusion, while progesterone has the opposite effect.

Bioimpedance measures the resistance of body tissue to tiny electric voltages. If you’ve ever measured your body composition such as fat content, this is very similar. Besides analyzing fat content, bioimpedance provides information about the skin, including hydration and sweating patterns.

As you have probably observed throughout your life, reproductive hormones have an impact on your skin. Your skin can change at different phases of the menstrual cycle, during puberty, and during pregnancy.

Heat loss is closely related to the onset of sleep. As you lose heat through your hands and feet, your skin temperature increases and your core body temperature decreases. This heat loss is closely related to the onset of sleepiness.

Heat loss is also related to your metabolic rate. The mechanism for the maintenance of the higher temperature during the luteal phase is still a matter of scientific discussion. Some researchers believe that reduced heat loss is responsible, while others believe that higher internal heat production (increased metabolic rate) is the cause.

Questions or feedback?

Got questions, concerns, or just want to talk? We’re here for you.

Start wearing Ava as soon as you receive it, no matter where you are in your cycle.

If you first start wearing Ava in a cycle where you haven’t yet ovulated (if you’re still in your follicular phase), then Ava will start working immediately to detect your fertile window in real time.

If you first start wearing Ava in a cycle where you have already ovulated (if you’re in your luteal phase), then Ava will use the date of your last period to estimate when your last fertile window occurred. As soon as you enter the date of your next period, Ava will begin detecting your next fertile window using the physiological data it gathers.

Over time, Ava learns your cycle and predicts the date that you’ll start your period. But occasionally, your period will come late or early. If Ava predicts the wrong day for your period, click on the teardrop-shaped period icon in the bottom right hand corner of the screen and de-select the flow level.

Please note that you cannot remove period dates from the future.

Prediction quality decreases with each day you don’t wear Ava. For the most accurate results, wear Ava every night.
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