blood

The level of oxygen in the blood: what is the norm and how to measure it on the Apple Watch?

07/02/2022 by

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Modern smartwatches are gradually acquiring more and more new features. It’s one thing to monitor a person’s activity, but quite another to assess their general physical condition. Apple Watch Series 6 received an interesting and especially relevant function today – measuring the level of oxygen in the blood. This information allows you to know how much oxygen from the lungs is captured by red blood cells for subsequent transportation to other parts of the body.

The content of the article

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In smart watches, this possibility was implemented for the first time. Apple Watch uses LEDs and photodiodes on the inside to non-invasively measure blood oxygen saturation. This sensor works in tandem with Apple’s new Blood Oxygen app.

The data provided by the program cannot be the basis for diagnosis and treatment, however, you can evaluate your general physical condition.

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Why is it important to know the level of oxygen in the blood?

The level of oxygen in the blood directly affects the functioning of the cells of the body. With a lack of oxygen, we begin to feel a breakdown, dizziness, weakness and headache. A low level of oxygen is also accompanied by a decrease in pressure, tachycardia, impaired consciousness, fainting, and a change in skin color.

Today, information is relevant that the lack of oxygen in the blood, or hypoxemia, directly related to COVID-19. Coronavirus affects the lungs, severe tissue damage interferes with the transfer of oxygen from the air to the blood. Doctors use information about the level of oxygen in the blood to assess the severity of the coronavirus disease and choose a treatment. This is an important indicator that determines the need to supply oxygen to the patient through a mask or the choice of ventilation as an urgent measure.

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What is the normal level of oxygen in the blood?

Oddly enough, but there is no clear prescribed norm. On a scale of 100%, it is considered that in a healthy person, oxygen levels in the blood should exceed 95%. This level is enough for the lungs to efficiently transfer oxygen to the blood. A one-time decrease in the level should not be frightening, but the constant shortage of the desired 95% is a reason to see a doctor.

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If the indicator is lower, then everything is bad?

Obviously low rates are not always a reason to sound the alarm. If a person has other chronic lung diseases, the level of oxygen saturation in the blood can drop to 88%. But the body is already used to it and adapted. Low indicators may not be related to the state of health, there are features of measurements both in smart watches (tattoos on the skin) and in pulse oximeters: a cold finger, nail polish, dead batteries. If you feel good even with low blood oxygen levels, then there may be no obvious reason to see a doctor.

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How to check blood oxygen levels on Apple Watch?

Please note that this feature is currently only available for Apple Watch Series 6 and Apple Watch Series 7, not earlier models.

The sensor itself is located on the back of the watch. The beams sent out by the LEDs illuminate the blood vessels on the wrist, and the photodiodes measure the return of the light. The principle of operation of the sensor is that, depending on the oxygen saturation of the blood, red and infrared light are absorbed differently. That is why the study of the reflected rays allows the watch to determine the color of the blood. Bright red blood is saturated with oxygen, while dark red fluid has less. Such blood does not receive enough oxygen from the lungs and cannot deliver it to organs and muscles.

To measure blood oxygen with Apple Watch:

1. Make sure the watch fits snugly on your wrist. In this case, the device should be comfortably placed on the arm – you should not pull the strap.

2. On your Apple Watch, open the “oxygen in the blood“.

Follow the prompts (shown only the first time you launch the app):

3. Stay still and make sure your wrist is level and the watch is pointing up.

4. Press the button “To begin” and hold your hand still for 15 seconds.

The clock will show a timer.

5. After the end of the reading, information about the level of oxygen in the blood will immediately be displayed on the watch screen. You can exit the data window by clicking the “Finish” button.

All blood oxygen readings will be synced to the Health app (tab Overview → Blood oxygen).

For best performance, it is recommended to place your hand on a table or in your lap and make sure the watch is at the same level as your wrist. You can’t clench your hand into a fist. As with any biometric sensor, there are a number of factors that can affect the results. For example, in people with tattoos, the readings may be incorrect – the ink will interfere with the penetration of light into the blood vessels. The volume of blood flowing under the skin can depend on body temperature, environment and varies from person to person, also affecting the sensor readings.

Buy Apple Watch Series 6

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How do I measure blood oxygen saturation on Apple Watch in the background?

By default, Apple Watch measures hours automatically throughout the day. The watch will take measurements from time to time. This usually happens if the person is not moving. Depending on the activity, the number of readings and the time between them will change.

In addition, you can adjust the measurement of blood oxygen levels in Sleep Focus mode and Theater mode. And since red light is used for measurements, it can be noticeable in the dark.

To enable or disable automatic background blood oxygen measurement:

1. Open the app “Settings” on Apple Watch.

2. Click on an element “Oxygen in the blood”.

3. To enable/disable the background blood oxygen measurement, set the switch of the same name to the required position.

4. To enable/disable background measurements “When Focusing Sleep” and “In theater mode» set the appropriate switches to the desired position.

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Which medical device measures the level of oxygen in the blood?

Measurement of the level of oxygen in the blood is carried out by a medical device pulse oximeter. This is a simple and affordable device that looks like a large clothespin. It is put on the finger and after 10-20 seconds shows not only the level of oxygen in the blood, but also the pulse. The principle of operation of the pulse oximeter sensor is similar to that of the Apple Watch – measurements are made non-invasively by sending and receiving light signals through the skin to the vessels.

Doctors recommend pulse oximeters to patients with chronic lung disease or heart failure to monitor their condition. But this device can also be used simply to monitor your health. However, the Apple Watch and the Blood Oxygen program already seem like a good alternative to the popular medical device.

Huami Amazfit Bip U review: “Beeps” with an improved screen and a sensor for measuring the level of oxygen in the blood

22/12/2020 by ALOK DAS

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It is difficult to create a universal product – we are all too different, with our own needs. And therefore Amazfit releases one model after one, adding or removing functions in them, saturating all segments of this market with its products as much as possible. In November 2020, another smartwatch was presented – Amazfit Bip U… The device differs from other brothers in the “Bip” line with improved display and additional functions. Their general list is really interesting, but we will tell you how the device ended up in this review.

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Specifications Amazfit Bip U

Display: 1.43 ″ touch display, 320 × 302 pixels, 305 PPI.
Case size: 35.3 x 40.9 x 11.4 mm.
Strap size: 20 mm.
Weight: 31 gr.
Case material: shockproof plastic.
Water protection: 5 ATM / 50 meters, you can swim in the pool.
Glass protection: 2.5D Corning Corning Gorilla Glass 3 tempered glass, anti-fingerprint oleophobic coating.
Sensors: Advanced optical sensor BioTracker 2 PPG second generation (pulse measurement), 6-axis accelerometer, gyroscope, SpO2 sensor (measurement of blood oxygen saturation).
Interfaces: Bluetooth 5.0 BLE, magnetic charging, one physical button.
Functions: heart rate monitor, blood oxygen saturation measurement, weather forecast, notifications, music and camera control, 60 sports workout profiles, sleep duration and quality, stress level and recovery, call and event notification in apps.
Compatibility: Android 5.0 and above, iOS 10.0 and above.
Built-in battery capacity: 230 mAh.
Working hours: 216 hours / 9 days (normal mode), 450 hours / 18 days in economy mode.

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Amazfit Bip U delivery set

The watch comes in a flat and compact white cardboard box with a picture of the gadget itself. The name of the device (the inscription Amazfit Bip U) is applied with a special paint that changes its shade depending on the angle.

The watch itself is packed with a bracelet in a moisture-absorbing film and placed in a recess in the cardboard core.

The kit also includes the same magnetic charging and detailed instructions in several languages, including Russian.

The black magnetic charging has an oval shape. There are two contacts in the recess. Attachment to the case is carried out using multipolar magnets in the watch and in the charger.

Amazfit Bip U design

The design of Amazfit Bip U practically repeats the appearance of other representatives of the “Bip” line. The robust plastic housing is rectangular with rounded corners.

On the right side there is a single physical button, pressing which is used to unlock the watch, wake up the screen, return to the previous menu, scroll the screen (up and down) during the workout and pause it (you must press and hold the button).

In addition, you can set the wheel press for quick access to a function when pressed for a long time. The wheel button rotates, but the clock functions are not tied to this action.

Below the screen you can see the name of the watch manufacturer. The watch has added an external elegance, but at the same time the corners of the screen can generate glare.

On the back, on a circular platform, you can see the updated BioTracker 2 PPG biometric sensor with a dual sensor, an SpO2 sensor and a pair of charging contacts. Placement is at a slight elevation to help provide improved skin contact.

The complete strap is made of soft silicone and has an adjustable length of 76-118 mm. The strap itself can be detached and is compatible with other Amazfit Bip models. Moreover, the watch can be fitted with any other standard watch straps, including metal and magnetic.

The Amazfit Bip U is available in three color options: black, pink and green. In this case, Amazfit decided not to be sprayed with numerous options, leaving the classic, clearly feminine and versatile stylish color.

Amazfit Bip U screen

With its display, this model is clearly different from its brothers. It uses not the classic transflective screen for the series, but a bright color TFT touchscreen with a diagonal of 1.43 inches (previous models had a display with a diagonal of 1.28 inches). Its shape turned out to be slightly elongated, which is why the resolution is a little strange – 320 × 302 pixels (the screens of previous models of the Bip line had a resolution of 176 × 176 pixels).

The increase in the number of pixels has clearly improved the clarity of the image. And it became possible to place more elements on the screen. The dot density is 305 PPI.

The glass is protected by the third generation 2.5D tempered Gorilla Glass and the anti-fingerprint protection is provided by an oleophobic coating. And you will need it – touch control is based on frequent finger touches and swipes.

But the watch did not receive the Always-On Display function, its operation on a TFT screen would lead to increased power consumption. You can set the screen backlight to automatically when you raise your wrist, and you can set the screen off time by setting the interval from 5 to 15 seconds.

These settings are available on the watch itself along the way: Settings -> Auto Screen Off…

Amazfit Bip U software

To fully work with the watch and activate it, you need to install the manufacturer’s proprietary application, Zepp (for iOS, for Android). To synchronize with a smartphone, you need to press a button on the watch, add the device in the program, then scan the barcode from the watch, and then confirm the connection by phone.

The Zepp app itself is actively being developed by the manufacturer, becoming a single information and control center for numerous wearable electronics from Amazfit. When you connect your watch for the first time, you may need to update its firmware, which, of course, you should agree with.

The application includes a store of available watch faces, but its main purpose is to fine-tune the behavior of watches and applications for information conclusions. Also in Zepp, you can see all the statistics collected through monitoring: stress level, steps, stress, sleep, etc. The information is presented in a rather detailed way using a variety of graphs. The application has a Russian interface and it’s easy to understand it. Unfortunately, the closed operating system does not allow third-party applications to be installed on Amazfit Bip series products.

The shell of the watch itself works by analogy with the Bip S and Bip S Lite. Swiping up on the home screen opens Action Center, and swiping down opens Control Center. From here you can quickly access Do Not Disturb modes, screen brightness, settings and alarms.

Swiping left or right from the home screen takes you to activity goals, heart rate, PAI, weather, and music controls. However, the user can change the order of the pages in the Zepp application at his own discretion.

You may need the side button to end your workouts (press and hold) or to return to the previous menu if you don’t want to use the swipe gesture.

Functions and capabilities of Amazfit Bip U

Smart watches entice many users with the ability to change watch faces.

In this regard, Amazfit Bip U does not lag behind – there are four built-in options in total and more than 40 can be found online in the Zepp app. It will not be difficult to choose an option that suits your mood or needs, including an animated one. It is possible to personalize your watch face with your own photos. And a couple of built-in options received a modular system – you can form a dial from information blocks that is precisely tuned to your needs.

Amazfit Bip U supports notifications of incoming calls and from applications, has its own stopwatch, timer, Pomodoro tracker, phone search, alarm clock, world clock, weather forecast, can control the camera and music.

The watch shows no more than 10 notifications, just like Bip S, Bip S Lite. There is no microphone in the watch – an incoming call can only be rejected or answered with a template SMS. To do this, swipe across the screen and select an action option.

Modern man cannot afford to avoid activity. Such a watch will become an irreplaceable assistant in numerous workouts.

More than 60 sports modes are supported, including running, walking, cycling, yoga, jumping rope, swimming, cricket and many more. They are grouped into 10 categories.

Bip U will record all the data about the current exercises to be analyzed later. The watch checks the distance traveled, monitors the change in heart rate, counts the calories burned. In the event of an increased heart rate, the watch will immediately notify its owner, recommending to reduce the load. Bip U are able to record tracks, but only through the use of a GPS smartphone – they do not have their own navigation equipment.

An important feature of the watch is the ability to measure the oxygen level in the blood. The updated optical sensor BioTracker 2 helps in this.

It can be used to numerically evaluate the oxygen saturation of the blood. This is important both for a general assessment of health status, especially during the coronavirus epidemic, and during intense training or in high altitude conditions. The watch will help you understand the reason for your poor health. Getting a result below 90% after several measurements is a reason to consult a doctor.

Amazfit Bip U is able to quite accurately detect sleep phases, including light and deep sleep, REM, wakefulness and deep sleep.

The findings are interpreted to assess sleep and make recommendations for improving sleep.

Huami’s patented proprietary optical sensor BioTracker 2 enables accurate heart rate measurement.

The watch is capable of continuous 24-hour monitoring, the results of which are displayed in the Zepp app. You can set the interval for automatic measurement: 1 minute, 5, 10 or 30 minutes, or manually measure the heart rate.

Zepp evaluates health based on a whole group of collected data: heart rate, duration of activity and more. An individual rating is formed for each user.

Modern man is highly susceptible to various stresses. Amazfit Bip U helps fight them with special monitoring. The gadget starts breathing training, helping to relax at the required moment.

And for women, the menstrual cycle tracking feature will be useful. By entering periods of critical days and ovulation into your smartwatch, you can receive timely notifications, planning your life and avoiding problems.

Autonomy of Amazfit Bip U (how long does the battery hold)

Amazfit Bip U received a 230 mAh battery. The manufacturer claims that the battery can provide up to nine days of battery life in the following daily mode:

Automatic heart rate measurement every 10 minutes;
200 screen activations;
A half-hour run and two measurements of the level of oxygen in the blood;
50 notifications.

If you set the automatic heart rate measurement interval once a minute, activate sleep tracking, sleep quality and stress monitoring, increase the number of notifications to 100, increase the brightness, then the watch will last 4-5 days.

To fully charge the device, on average, it will take 1 hour and 45 minutes of interaction with the magnetic pad.

Amazfit Bip U water resistance

The watch has received the standard water resistance for its line up to 50 meters, however, it is not recommended to swim with the device in salt water.

The watch comes in handy while swimming, tracking your movements and keeping track of your achievements. But diving deep in them or doing high-speed water sports is still not worth it.

The most important thing to know about the Amazfit Bip U watch

Amazfit Bip U price is 3 times lower than Amazfit GTS 3 and 6 times lower than Apple Watch SE;
The main differences between Amazfit Bip U and Amazfit Bip S are: a better screen, lack of GPS (Amazfit Bip S has it) and a sensor for monitoring the level of oxygen in the blood (Amazfit Bip S does not have it).
The watch received a beautiful fashionable design with curved corners of the case and screen. The device can be purchased in three colors.
The average operating time of the watch from one charge is 9 days;
You can activate the screen by raising your wrist or by pressing the wheel button;
The watch is waterproof, you can swim and take a shower in it.
Third-party applications cannot be installed. Most of the settings are available in the Amazfit Watch app on the smartphone.
No speaker and microphone. Vibration is present.

Amazfit Bip U price

The novelty is quite consistent with the spirit of the company, to create inexpensive and effective solutions. You can buy Amazfit Bip U for about 4,500 rubles, which roughly corresponds to the price of Amazfit Bip S Lite and slightly cheaper than Amazfit Bip S.

Buy Amazfit Bip S Lite in Svyaznoy
Buy Amazfit Bip S Lite on AliExpress

Conclusion

Comparison of Amazfit Bip U with its fellows in the line is inevitable, especially since the price is not very different. Initially, the success of this watch series was based on the use of a transflective screen, with a low resolution, but perfectly readable in the sun. The Bip U model has become a kind of experiment. The user was offered a brighter and clearer screen due to the abandonment of some functions (GPS) and a slightly reduced battery life. But the heart rate sensor has improved and it became possible to check the level of oxygen in the blood, which is rare for devices in this price category. With the help of Bip U, the manufacturer enriches its product line even more, making it as interesting as possible for users with different needs.

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Review of the Huami Amazfit Band 5 bracelet with a blood oxygen sensor

29/10/2020 by ALOK DAS

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It seems that Xiaomi, with the help of its subsidiary Huami, is trying to saturate and conquer the wrist electronics market as much as possible. New items, which is important – successful ones, appear quite often. And those functions that are not implemented in Mi Band bracelets immediately appear in counterparts from Huami. Just a few months after the release of the bracelet, the Mi Smart Band 5 appeared, no, not even its competitor, but the development – Amazfit Band 5 from Huami. Let’s take a look at this fitness bracelet.

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Amazfit Band 5 specifications

Dimensions: 47.2 x 18.5 x 12.4 mm, weight 12 g without strap, 24 g with strap.
Display: diagonal 1.1 inches with a resolution of 126 × 294 pixels, touch AMOLED, 2.5D tempered glass.
Materials: polycarbonate case, elastic polyurethane strap.
Battery: lithium polymer 125 mAh, charging time 2 hours, average use time 15 days, 25 days in economy mode
Determination of coordinates: using your phone.
Sensors: optical PPG biological tracking, three-axis accelerometer and gyroscope.
Wireless connection: Bluetooth 5.0
Compatibility: Android from version 5.0, iOS from version 10.
Functions: heart rate, stress level, blood oxygen, cycle tracking for women, pedometer, alarm clock, notifications, reminders, weather, 11 options for sports modes.
Waterproof: up to 5 atmospheres, you can swim in the pool.
Other: NFC, speaker and microphone are absent, vibration is present.

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Amazfit Band 5 delivery set

The device is located inside a stylish white box with a corporate logo and a color image of the bracelet itself. The design of the package is such that it will not be possible to secretly open it – you will have to pull out the side tape. This guarantees the safety of the device in its original form. There are only three items in the box: a thick, almost 200-page manual in 12 languages, a packed magnetic charging cable and a packed bracelet.

Amazfit Band 5 design

The appearance of the bracelet itself cannot be called revolutionary – there is no point in experimenting with what is already in demand – the design is almost identical to Xiaomi Mi Band 5. The elongated capsule of the electronic device is placed in a TPU strap. The complete strap itself is hard, there are many holes on it. This allows the bracelet to fit any hand – from a large man’s to a miniature nursery. And the straps can be changed to suit your taste.

The front side of the device is given to a color touch screen. At the bottom of it there is a touch button similar to a flattened ellipse. The Mi Band 5 has a round one. At the back in the middle are sensors for taking readings of the pulse and oxygen content in the blood. They shine in red and green. At the bottom, in a small depression, you can see a pair of contacts for charging the device.

Thanks to this design, now, to charge the bracelet, it is not necessary to get it out of the strap by stretching it. The round contact pad is magnetically attached to the device body.

The capsule itself is classic black, but the overall look can be noticeably diversified with the help of colored bracelets.

♥ BY TOPIC: Review of Xiaomi Amazfit Bip S Lite watch for 3,990 rubles + how it differs from Amazfit Bip S.

Amazfit Band 5 screen

The device received a rather big screen with a diagonal of 1.1 inches. It is a bright AMOLED with a resolution of 126×294 pixels. There seem to be few dots, but they are not visible on such a small screen.

The front part is covered with tempered 2.5D glass with rounded edges. There is an oleophobic coating. This protection is enough to prevent scratches and fingerprints on the small screen.

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Amazfit Band 5 operating software

When you turn on the bracelet for the first time, it will offer to select a language from the list, Russian is available. And then you need to synchronize with the proprietary Zepp application. It is designed to work with Huami electronics. The Zepp app is available on the App Store and Google Play.

To connect the bracelet in the program, you must select the type of device, start the search and confirm the connection request on the bracelet. Zepp will then check the bracelet firmware version and try to update it if necessary.

The very first Zepp tab will show the amount of information collected by the bracelet. This is the pulse, and the oxygen content in the blood, stress level, information about activity.

The second tab got the strange name “Enjoy”. There are generally all the options available in the application, but not all of them are compatible with the Amazfit Band 5.

The third tab is Profile, which is dedicated to a specific device. There you can see sections for managing screen unlock, incoming calls, alarms, notifications. In the Store, you can choose the type of watch face to your liking or taking into account the rating of users. There are over 45 watch faces on offer so far, with two of them being customizable.

All fine-tuning is carried out precisely from the device profile in Zepp. For example, here you can set the behavior of the bracelet with an incoming call or from which applications to deliver notifications, change the order and set of menus in Amazfit Band 5.

Amazfit Band 5 functions

With vertical swipes, you can scroll through the available functions, entering them by tapping on the screen. Returning back is realized through the touch button at the bottom of the display or a horizontal swipe from left to right.

Status… Here you can see how many steps you walked and burned calories by comparing statistics for the last 7 days.

PAI… This section has appeared in wearable electronics recently. The bracelet analyzes the physical activity of a person and gives some points for them. Their weekly sum is the index. It is recommended that you earn at least 100 points every week. And the application shows the points scored not for the current day, but for the last week. This index should motivate a person to maintain an active lifestyle.

Pulse… In this menu, you can forcibly start measuring your heart rate, as well as view the history for the current day. This makes sense if the auto metering option is set.

Cycle. This is where the menstrual cycle of women is tracked.

In order for the section to appear on the bracelet, you must specify the female gender in the profile settings, then go to the Home page tab in the Zepp application, select the Cycles block and enter the necessary data.

SPO2 (Blood Oxygen Measurement). This feature is not only trendy for 2020 devices, but also useful in today’s pandemic.

The device can detect blood oxygen saturation. It is this function that is, perhaps, the main difference between the bracelet and its counterpart in the face of Mi Band 5.

Notifications. This is where your last unread messages and app notifications are stored. After viewing them, they will hide.

Stress level. The bracelet analyzes the condition of the wearer and somehow assesses the level of his stress, which can be viewed here. The measurement can be started manually or automatically via the smartphone app.

Breath. There is no analysis here, you just need to perform breathing exercises after the animation.

Developments. There are reminders of all your appointments or business. You can add them to the menu, at the right time you will receive a notification.

Weather. The smartphone app will tell you the current weather forecast and what awaits you this week.

Workout. It is offered to use one of 11 training modes, including: running, treadmill, bicycle, exercise bike, walking, swimming, yoga, jump rope, elliptical trainer, rowing machine and exercise. It is interesting that as soon as a person stops, the bracelet pauses.

When you start driving, sport mode will reactivate. This will allow you to more correctly calculate the speed and pace.

Additionally… There are less significant sections here: Timer, Music, Camera, Alarm, Settings and others. The function of remote control of the phone camera will be interesting. But it actively consumes battery life.

You can expect more features to come with updates to your device. For example, soon the Mi Band bracelets, like the Amazfit band 5, will be able to calculate body temperature based on heart rate readings and Liebermeister’s law.

Autonomy of Amazfit Band 5

Tests carried out by users confirm the claimed autonomy of the device. In heavy load mode: repeated daily measurements of blood oxygen level, heart rate and using active mode, the Amazfit Band 5 discharges approximately 10% daily. But in normal mode, using a pedometer, notifications and an alarm clock, the bracelet will honestly serve its 2 weeks. If you lower your heart rate, you can add a few more days to autonomy.

Water permeability of Amazfit Band 5

The bracelet is waterproof to a depth of 50 meters, and the water must not be salty (sea, ocean). The manufacturer guarantees full functionality of the watch in case of splashes, rain or snow, while swimming in fresh water, as well as taking a cold shower.

Conclusion

Amazfit Band 5 turned out to be a slightly improved version of the popular Xiaomi Mi Band 5 bracelet. And if the appearance of the Alexa voice assistant from Amazon is hardly in demand in our area, then the function of measuring the oxygen level in the blood is especially relevant today. Externally, both devices are almost identical, the only difference is in the shape of the button under the screen. And additional functions slightly reduced the autonomy of the bracelet.

Amazfit Band 5 in official retail costs about 4000 rubles or $ 50, which is a quarter more expensive than Mi Band 5. Users are invited to pay a little extra for a very useful feature that appeared in Amazfit Band 5.

Buy Huami Amazfit Band 5

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Blood oxygen levels: what is the norm and how to measure it on Apple Watch?

18/09/2020 by ALOK DAS

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Modern smartwatches are gradually acquiring more and more new functions. It is one thing to monitor a person’s activity, but quite another to assess his overall physical condition. Apple Watch Series 6 received an interesting and especially relevant function today – measuring the level of oxygen in the blood. This information allows you to find out how much oxygen from the lungs is captured by red blood cells for subsequent transport to other parts of the body.

The content of the article

♥ BY TOPIC: Body mass index (BMI): what it is and how to calculate it for men and women.

This is the first time that such an opportunity has been implemented in a smartwatch. Apple Watch uses internal LEDs and photodiodes to measure blood oxygen saturation non-invasively. This sensor works in tandem with Apple’s new Blood Oxygen app.

The data provided by the program cannot be the basis for the diagnosis and treatment, nevertheless, it is possible to assess your general physical condition.

♥ BY TOPIC: What should be the pulse of a healthy person and how to measure it.

Why is it necessary to know the level of oxygen in the blood?

The oxygen level in the blood directly affects the functioning of the body’s cells. With a lack of oxygen, we begin to feel fatigue, dizziness, weakness and headache. Low oxygen levels are also accompanied by a decrease in pressure, tachycardia, impaired consciousness, fainting, and discoloration of the skin.

Today, information is relevant that a lack of oxygen in the blood, or hypoxemia, directly related to COVID-19… Coronavirus affects the lungs, severe tissue damage interferes with the transfer of oxygen from the air to the blood. Doctors use information about the oxygen level in the blood to assess the severity of the coronavirus disease and choose a treatment. This is an important indicator that determines whether a patient needs to be supplied with oxygen through a mask or whether ventilation is selected as an urgent measure.

♥ BY TOPIC: How to Swim with Apple Watch: Instructions for Pool Swimmers.

What is the normal blood oxygen level?

Oddly enough, there is no clear-cut norm. On a scale of 100%, it is believed that a healthy person should have blood oxygen levels above 95%. This level is sufficient for the lungs to efficiently transfer oxygen to the blood. A one-time decrease in the level should not be scary, but the constant shortage of the desired 95% is a reason to consult a doctor.

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If the indicator is lower, then everything is bad?

Apparently low rates are not always a reason to sound the alarm. If a person has other chronic lung disease, the oxygen saturation of the blood can be reduced by up to 88%. But the body is already accustomed to this and adapted. Low indicators may not be related to the state of health, there are measurement features of both smart watches (tattoos on the skin) and pulse oximeters: a cold finger, nail polish, dead batteries. If you feel good even with low blood oxygen levels, then there may be no clear reason to see a doctor.

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Does oxygen measurement work with Apple Watch in Russia (Ukraine, Kazakhstan)?

Unlike the ECG measurement function, which is not available to Russian users, the Blood Oxygen Measurement Tool works in Russia (also in Ukraine and Kazakhstan) on Apple Watch Series 6 and newer. A complete list of countries in which the option is available can be found below:

Buy Apple Watch Series 6

♥ BY TOPIC: Yanni or Lorl? It’s incredible, but people hear this word in different ways. What do you hear?

How to check blood oxygen levels on Apple Watch?

Please note right away that this feature is currently only available for Apple Watch Series 6 and not for earlier models.

The sensor itself is located on the back of the watch. Beams sent out by LEDs illuminate the blood vessels in the wrist, and photodiodes measure the return of light. The principle of operation of the sensor is that, depending on the oxygen saturation of the blood, the absorption of red and infrared light occurs differently. That is why the study of reflected rays allows the watch to determine the color of blood. Bright red blood is saturated with oxygen, whereas dark red liquid contains less oxygen. Such blood does not receive enough oxygen from the lungs and cannot deliver it to organs and muscles.

To measure blood oxygen levels using Apple Watch:

1. Make sure the watch is snug against your wrist. In this case, the device should fit comfortably on the hand – you should not drag the strap.

2. Open the “Blood oxygen»And follow the prompts.

3. Stay still and make sure your wrist is level and the watch is facing upward.

4. Press the “Start” button and hold your hand still for 15 seconds. A timer will be displayed on the clock.

5. After the end of the reading, information about the oxygen level in the blood will be displayed on the watch screen. You can exit the data window by clicking the “Finish” button.

All blood oxygen readings will sync with the Health app.

For best performance, it is recommended to place your hand on a table or on your lap and make sure the watch is flush with your wrist. You can’t make a fist. As with any biometric sensor, there are a number of factors that can affect your results. For example, in people with tattoos, the readings may be incorrect – the ink will interfere with the penetration of light into the blood vessels. The amount of blood flowing under the skin may vary depending on body temperature, environment and varies from person to person, also affecting the sensor readings.

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How do I measure blood oxygen saturation on Apple Watch in the background?

You can set your Apple Watch to measure blood oxygen levels in the background. The watch will measure itself from time to time. This usually happens if the person does not move. Depending on the activity, the number of readings and the time between them will change. And since red light is used for measurements, this can be noticeable in the dark. If such light interferes, then background measurements can be turned off:

1. Open the Settings app on your Apple Watch.

2. Click on the “Blood oxygen” item, and then turn off the “In sleep mode“And”In theater mode“.

Please note that when activating the “Track sleep with Apple Watch»Blood oxygen measurements will only be taken during sleep.

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What medical device measures the oxygen level in the blood?

The oxygen level in the blood is measured by a medical device called a pulse oximeter. This is a simple and affordable device that looks like a large clothespin. It is put on the finger and after 10-20 seconds shows not only the oxygen level in the blood, but also the pulse. The principle of operation of the pulse oximeter sensor is similar to that found in the Apple Watch – measurements are performed non-invasively by sending and receiving light signals through the skin to the vessels.

Doctors recommend pulse oximeters for patients with chronic lung disease or heart failure to monitor their condition. But this device can also be used simply to monitor one’s health. However, Apple Watch and the Blood Oxygen program already seem to be a good alternative to the popular medical device.

Review of the game “Blood feud. The witcher. Stories “for iPhone and iPad

09/09/2020 by ALOK DAS

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Some plots are so good that they are embodied not only in games, but also in their most diverse variations. This is exactly what happened with The Witcher. If you don’t like the classic RPG with heavy graphics and active control of the hero, then the card game Gwent is at your disposal. She is much calmer, but no worse plunges into this fascinating world. And if you do not wave the sword, then you will have to think about the strategy regularly in Gwent. Publisher CD PROJEKT decided to create something universal and at the same time original – the game “Feud of blood” from the cycle “The Witcher. Stories”.

Download the game “Blood feud. The witcher. Stories ”for iPhone and iPad (App Store)

Blood Feud is not a classic role-playing game. This is a kind of experiment that includes the features of several genres at once. The main part of the action takes place within the framework of a visual novel, in which there are features of strategy and text quests, and the “highlight” of “Blood Feud” can be called a reworked Gwent for it. Immediately, we note that in this game you will not see your favorite popular heroes of the series. The focus will be on either little-known characters, or completely new ones.

So our character is Meve, Queen Dowager of Lyria and Rivia. Faced with the betrayal of family and friends (for the world of the Witcher – a common story), she goes into exile. We must help the queen not only regain her throne, but also stop the invasion of Nilfgaard. Meve has appeared in Sapkowski’s The Witcher Saga. The events in which we take part take place far away and parallel to the classic story of Ciri, Yennefer, Triss and Geralt.

In terms of gameplay, this is an isometric RPG in which you need to explore locations. There are five of them in the game, which will allow you to look into different corners of the Witcher world. The game is accompanied by a lot of events, dialogues and plot choices. Of course, all of them will influence the further development of the plot. At the same time, “Blood Feud” is far from fixated on a simple journey across the map. In addition to traveling along it, we are given the opportunity to immerse ourselves in conversations with the characters and take part in battles, as well as to improve the camp. Under the foot avatar of Meve, which we control, there is actually an entire army and advisers hidden. We have to wander around the localities, communicate with residents and our own companions, look for resources and participate in quests.

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The plot unfolds as if we are reading a well-illustrated book. The scenes are accompanied by the voice of the narrator, there are text vignettes and animation. A well-chosen answer can open (as well as close) an entire storyline. From the world map, you can switch to your camping camp, where its improvements, the history of this world and its inhabitants are available. The game will constantly present us with a choice, and it cannot be called unambiguous.

The whole story of The Witcher has already taught that there are no good or wrong deeds – you have to choose between bad and very bad. Have you decided to rescue a poor elf who is ready to be lynched by the crowd? But he suddenly turns out to be an enemy spy and is not at all eager to thank you. And there are plenty of such forks, so the queen will quickly have to understand that the path to the goal will not be paved with good alone. And is there any good in this cruel world?

But the heart of this game is card battles. The outcome of the battle and the whole story depends on how well you are able to play Gwent. This game itself in “Feud of Blood” received a new look, given the fact that the game was originally single. The developers moved away from the original concept and experimented with mechanics, somewhat simplifying them for the sake of the player’s ability to fight with the computer. Cards receive bonuses and skills depending on their location on the game table. The battles have become more intense thanks to the interaction between the cards.

There are as many as 250 cards in the game, the formation of the deck will occur as the plot develops and taking into account our preferences. That’s just not all cards will be available to the player, nevertheless, this will not prevent the end of the game from forming a truly invincible army. As we complete the tasks, we will receive new elements for our deck or part of them. Interestingly, the card game will appear not only in the battle, but in some events that require our actions. Puzzle battles will also add interest to the passage, where you will have to come up with completely original tactics.

In the meantime, there is no need to know about it. ”

Blood Feud is a large and high-quality project, behind which lies both an interesting plot and a variety of game mechanics. The developers promise more than 20 different outcomes, so if you like to replay the games for the sake of a new ending, there will be something to do. The creators of the game see it as part of the carefully crafted world of The Witcher. And the participation of the author, Andrzej Sapkowski, in this process is no longer required. “Blood Feud” is well illustrated, filled with capacious dialogues that link into an interesting story. All of this cannot fail to attract novice players, but at the same time instill interest in the underlying Gwent. “Blood feud” will not be difficult to believe and turn on the fantasy, embarking on an interesting adventure.

Download the game “Blood feud. The witcher. Stories ”for iPhone and iPad (App Store)