Max strain represents the peak value of Heart Strain during each workout.

Heart Strain is a measurement based on the ST-segment deviation recorded by the Frontier X from the CC5 Lead position. This deviation could be due to a variety of reasons, including oxygen deprivation to a part of your heart, electrolyte imbalance and conduction defects.

During exercise, a deviation of less than 0.1 millivolts is considered insignificant, and above 0.2 millivolts is considered significant, and may suggest that your heart is being over-strained. However, it is also possible to have a high value of Heart Strain due to an unusual ECG morphology. This can be determined by visual analysis of the ECG by a Cardiologist or trained expert.

i’ve just started with the device today. Im medical by trade (not a cardiologist no physician – im in a surgical specialty). I’m 8 years post stenting and worried about , well pretty much everything. I had a bit of a panic at my first mild exercise with the device where I had a peak strain of 0.17, but then I looked at where the peak came and this wasnt associated with anything different on the walk but I suspect an element of noise in the signal. There was significantly more exertion for a hill where the ECG seemed to have a better quality pick up and a much nicer number of 0.04 (0.03 starting). I think you need to look at the context as to when it happened if you are able to. I’ve done a couple of cycle rides today that were much more intensive, again a couple of peaks of strain that were in the mid teens. These were not associated with any extra exertion however and from a physiological perspective its unlikely that there would be transient ischaemia that would settle within a few seconds. From my perspective I am going to ignore these very transient spikes (2 in a 30 minute cycle) if the overall intensity of the exercise was pretty constant.