• support@fourthfrontier.com
  • Noticing some pretty frequent abnormalities when I’m working pretty hard. In general, I’m a healthy, competitive cyclist who works out 2+ hours per day. These graphs are mildly concerning to me. My max HR is around 208 at this point in my fitness with a resting HR of around 42. I do have an appointment with a cardiologist soon, but am…Read More

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  • Question about ECG – Will the ECG data be captured when I click on Start Activity ? I would like to see / share my ECG data after/during exercise. I can see only option as (share link). My requirement is to capture the ECG data by default whenever I exercise and review the data later.

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  • Hi,
    How can I see breathing rate? Can the Apple Watch show this or is there any other device that will work?

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    • The value shown as ‘ Effort’ during your activity is the same as your breathing. You will notice that the unit for this value is breaths/min. We are using breathing rate as a measurement of effort because there is a lot of research to show that breathing rate is more closely correlated with perceived effort than heart rate.

  • Hi
    Just wondering has anyone developed a far higher resting heart rate after the vaccines and covid my resting heart rate is now at 85/90 before all of this it would have been 60/65 also I think I now might have POTs which I’m looking into with my doctor I’ve had ECG, bloods, echo and calcium score all done zero calcium and all other tests nor…Read More

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    • Hi, I have unfortunately had COVID twice and gave notice that my resting heart rate is higher too. Initially, before this it was borderline bradycardia as it was around 50 and on occasions would go below when measuring my Kardia ecg device. Now it varies between 58 and 77 and on occasions been higher, initially after covid the heart rate was…Read More

  • why does hrv spike during hard exercise and strain stays low?

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