We are driven by science

In a continuous effort to improve, be innovative and stay up-to-date, we collaborate and work with a variety of best-in-class research partners.

We partner with the leaders in science

From universities to experts in their respective fields, we make sure to work with the best in the business to continuously improve our product.

The Science behind KENKOU

Our measurement is based on the intersection of research, science and technology. We enable measurement of cardiovascular vital data using just a smartphone, and use this data to calculate values that allow for an in-depth look into the state of the body.

What cardiovascular data do we measure?

Heart Rate Variability (HRV)

The time interval between the heartbeats of a healthy heart is constantly fluctuating, and indicate how well your body handles stress. The intervals over a given time period are referred to as your heart rate variability, or HRV.

A high HRV indicates that your body can cope well with stress, whilst a low HRV can be a symptom of fatigue, stress or even illness. There are many values that can be used to measure HRV, of which RMSSD und PNN50 are two.

Root Mean Square of Successive Differences (RMSSD)

The RMSSD tells you how well your body is recovering from stress, and reflects how well the parasympathetic nervous system can help you to regenerate and recover. A high level of stress relief is partly due to a high RMSSD.

The PNN50 is the fraction of consecutive heartbeats with an interval greater than 50 milliseconds between them. Therefore, a higher PNN50 value shows that your heart rate has drastically changed in a short time period.

RSA Amplitude

Respiratory Sinus Arrhythmia (RSA) Amplitude, sometimes referred to as the HRV amplitude, is the change of heart rate believed to be caused by breathing. We measure it by breaking the measurement into sections which match the expected breathing interval of the user – ten seconds in length – , calculating the difference between the maximum and minimum heart rate, and averaging the results found for each of the sections; AVG (Max – Min Heart Rate).

...and so much more to come

Examples of indexes we can compute

Tension Index

The Tension Index is a heart rate index and is determined by the variability of the heart rate. It is an objective indication of how much stress and tension there is in the body.

Recovery ability

The Recovery Ability is related to the relaxation ability and is measured by the parasympathetic nervous system, which controls the body while at rest. The easier it is for the body to calm down, the higher the stress resilience is.

How do we determine these values?

Vital data measurement

Our team has developed a patented technology that enables vital data measurement (including HRV) using just the smartphone camera.

Detecting blood vessel changes

Changes in the blood vessels are detected and analysed. When blood is pumped through the vessels they appear darker, whilst blood being pumped out leads to lighter vessels.

Analysis via the flash light

The smartphone camera flash illuminates the fingertip and thus makes the changes in the blood vessels, which occur due to the natural heartbeat, visible for analysis.

Data analysis & index computing

Based on these changes the heartbeat is detected, the data is analyzed and the heart rate variability is determined, which is the foundation for computing further vital data indexes.

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