Polar A370 Review

With the Polar A370, the company from Finland presents an alternative to its already longer available A360. The new features now include a dynamic 24/7 pulse measurement on the wrist for the first time, as well as a more detailed breakdown of the sleep phases, including feedback. Our Polar A370 test soon takes a closer look at Polars Fitness Bracelet.

Polar 370 vs 360 – What remains the same?

The Polar A370 and the predecessor model A360 are very similar and have many similarities. In our A360 Review you can find all the details. The weight is depending on the size variant at a maximum of 37.3g, the display resolution at 80×160 pixels and the watertightness at WR30, which allows the A370 to be worn even during swimming. The battery charging principle, which is one of our criticisms with the A360, has remained unchanged. The access to the USB interface is a bit cumbersome. Because it must be protected against water penetration, Polar has developed a cover that has gotten somewhat fiddly.

The battery life should be 24/7 activity tracking and continuous pulse measurement at about 4 days when training 1 hour per day in the training mode and deactivating the smart notifications.

Furthermore iOS (iOS7 or higher) and Android (Android 4.3 or higher) are supported. In addition, the A370 is compatible with the Polar Balance health balance, the Polar Heart Rate Sensor Polar H10 (our H10 Review ), and the Apple Health Kit, Google Fit, MyFitnessPal and MapMyFitness.

What’s New?

Compared to the A360, the following features have recently been added and offer added value:

  • Dynamic 24/7 pulse measurement in Activity-Tracker mode
  • SleepPlus: Advanced sleep analysis
  • Instant GPS: Integrate GPS of the smartphone into training units
  • Classic watch closure
  • Use as a pulse sensor for additional devices via Bluetooth

The following are some of the new features.

24/7 pulse measurement on the Polar A370

Often desired by Polar fans, but so far but not integrated with polar trackers, was the 24/7 pulse measurement. This is the pulse measurement outside the training mode. This has been offered by comparable manufacturers such as Fitbit or Garmin for a long time. On the A360 as well as on all other Polar Fitness tracker, the integrated pulse meter is active only during the training mode.

With the Polar A370, this changes, because it measures the heart rate at rest as well as during daily activities automatically. Polar uses a dynamic algorithm that operates at a minimum of five minutes intervals. However, if the accelerator sensor detects that the carrier moves with higher activity (for example, walking or running), the A370 dynamically adjusts the sampling rate of the pulse measurement and measures at shorter intervals. The A370 also detects periods of inactivity and detects the resting heart rate every five minutes during these rest periods.

Polar A370 – New sleep features

The Polar A370 combines the continuous pulse measurement with the new Polar Sleep Plus feature. Polar Sleep Plus automatically detects sleep and wake-up times, the duration and quality of sleep, by means of the movements of the wrist. Sleep disruptions should also be reliably detected automatically.

PolarFlow records:

  • Sleep duration : shows the total time between sleep and wake-up time of sleep.
  • Actual sleep : indicates how long you’ve slept.
  • Interruptions : indicate how long you were awake or restless during the night.
  • Sleep Continuity : Tells how constant and regular sleep was on a scale of 1 to 5. A 5 is a sleep without interruptions. The lower the value, the more interruptions were there during sleep.

In the Polar Flow app, the sleep duration can be set to determine a sleeping goal. Sleep can also be assessed retrospectively. Based on the measured sleep data as well as the sleep evaluation, flow feedback can give the sleep quality. In Flow, of course, the long-term sleep rhythm can also be seen.

Training functions of the A370

In addition to the 24/7 Activity Tracker, the A370 also offers a training mode, which can be started with numerous sports profiles (from a list in over 100 sports). If one chooses the right sport, the calorie calculation is improved.

If you have the smartphone, GPS data can be recorded on the smartphone. The speed, distance and the distance covered are recorded. Even without the smartphone, the distance and tempo can be recorded using the movements of the wrist, for example when walking outdoors or on a treadmill.

Polar has also thought of the A370 especially for runners, because it can be transferred from flow programs to the A370. Running programs, for example, can be prepared with one of the adaptive PolarFlow training plans on 5 km, 10 km, half marathon or marathon runs. Alternatively, you can also create a training plan that fits your own fitness and individual goals.

Here are some examples from previous Polar tests:

Polar A370 – Questions and Answers

  • Can the changeover brakes of the A370 be used on the A360?
    • Yes.
  • Is the A370 also equipped with a GPS receiver?
    • No, but the A370 / PolarFlow can use the GPS receiver of the smartphone. If you absolutely need integrated GPS, look more like the similar M430 (here our M430 review ). The M430 is not a fitness bracelet, but a larger sports watch with some additional training features.
  • What are the main arguments against the predecessor A360?
    • Intelligent 24/7 pulse measurement, SleepPlus (extended sleep analysis), GPS via the smartphone
  • Is the running index supported?
    • Currently not.
  • Will the extended SleepPlus sleep analysis also be available for other PolarTracker?
    • SleepPlus can be used only with the A370 and the M430 (as of 25.02.17).

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