frequently asked questions

Why are you doing this project?

For two reasons: primarily because we are very curious about how much difference there is performance-wise between different brands and types of shoes. Secondly, because we have learnt from our long test work that the Airia shoes perform great in various types of tests. This would be a way to get even more interesting facts of the Airia concepts good performance

What exactly is the thesis?

Different shoes produce different biomechanical stride patterns. Different stride patterns affect use of different groups of muscles. Difference in use of muscles produce different physiological response. And testing Heart Rate with different shoes can be a good way to investigate and show these differences.

How are these tests conducted?

By running with different shoes on different occasions, on a treadmill with the same speed and same test routine. See the test instructions for more precise information on the test protocol.

Is there a risk of tests showing false differences?

Since we invite runners all over the world to conduct the tests, we cannot control every test situation. The test protocol is constructed to minimize risk of errors and mistakes. But if and when they occur, they are not likely to skew the result in the same direction. The amount of test data will be a way of securing any measured differences.

Which are the potential sources of error?

Uncalibrated treadmills tend to have a difference between actual speed and the speed on the display. But since every runner is asked to do the test on the same treadmill with an exact repetition of the test protocol, this source of error can be minimized. Another potential source of error would be variations in the heart rate recordings. But studys have shown cheststrap-based monitors are very accurate. Ambient temperature and day to day heart rate variability can result in small differences in the heart rates measured during the test, but are not likely to skew the result in the same direction.

Why do you think the Airia shoes will perform better than other running shoes?

Simply because we have seen from our own long period of testing that our shoes perform great in comparison. We have seen better splits conducting 5K time trials with groups of test runners, we’ve seen better performance of our shoes in testing of running economy with 3D motion capture cameras and we’ve seen lower heart rate response with Airia shoes in tests similar to this one.

If the Airia shoes are better as you say, what is your explanation?

So far we have seen that most people benefit from the Airia concept, but not everybody. Each individual has the potential for optimizing their running stride biomechanics, and Airia helps the vast majority to do this.

Will I get free shoes for doing this?

If you don´t have access to a pair of Airias and are chosen to be one of the test participants, we will send you a pair of shoes. In return we are grateful for a swift and thorough follow through of the test and reporting. Nothing more to it than that.

How do you select participants?

We aim to have an even distribution of test runners from different subgroups, such as male/female, recreational runners/competitive runners and a spread in best running speed groups. We will choose the first applicants in the respective groups. In total we expect to collect data from more than 100 runners.

Tested Heart Rate monitors and ways to export .tcx files?

We have currently tested and made the following systems work. If you use another system system and find that it works/don´t work, please tell us.

How to get a valid .tcx from Suunto

The Suunto and Movescount system is designed to produce .tcx files based on GPS information. Exporting indoor session without GPS data will result in .tcx files with lost information. The fix takes less than one minute: export a .fit file from instead of .tcx. Save as usual and navigate to the conversion site Follow the instructions there to convert the .fit file to a .tcx file. Save the new .tcx and upload that one to My Page.

How to export .tcx files from

You will need to transfer your trainingfile from to PolarFlow. Then login to PolarFlow, find the file in the calendar and export training as .tcx

Heart rate rise during the test?

The test relies on your heart rate to rise during the test. Minimum difference of heart rate after 3 minutes compared to heart rate at 30 minutes is 4 %. If your heart rate at the end of the test is 165 bpm then your heart rate at 3 minutes must have been at most 158 bpm (165/1.04) for the test to be valid

How often are the results updated?

The graphs both under My Page and under Results uses the most current data uploaded from the participants in the test study.

How to export files from Runkeeper?

Runkeeper will let you export GPX files with HR data included. This GPX file will need to be converted to a TCX file, there is as of our knowledge no online tool that will do this for you. But there is a installable software that does this.

  1. Export GPX data from Runkeeper.
  2. Download this converter:
  3. Convert the files from GPX to TCX using the tool above.
  4. Upload as normal to


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