Heart Rate can give you false comfort even if you have high cardiac strain and will also prevent a fit person from pushing themselves just because their heart rate is high.

‘Cardiac Strain’ (known as ST-depression in medical literature) measures the amount of Oxygen deprivation experienced by the heart muscles. A small amount of Cardiac Strain (up to 0.15 mV) is considered good for your heart, since it helps to build new blood vessels. However, a higher value of Cardiac Strain for prolonged periods of time can cause damage to your heart cells. Exercising at an intensity causing high Cardiac Strain is not recommended and in the long term may lead to conditions such as fibrosis or arrhythmias (3,4).

The Frontier X measures these changes in your ECG and provides your Cardiac Strain values in real-time on our app. It also warns you with a double-vibration alert if you cross your pre-set threshold, helping you exercise at an exercise intensity that is safe for your heart. This alert can tell you whether you should finish the last lap, run that extra mile, do those last few push ups, or just give your heart a rest.

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