Swimming training effect accuracy?

I had a 2000m pool swim earlier this week. It was moderate intensity for 43 minutes, with an average heart rate of 120 (zone 1+2) . I got an aerobic benefit of 2.2 (maintaining), and aerobic benefit of 0.8 (no benefit). Seems quite correct to me.

Heart rate zones for running and swimming are different. Max HR is around 15% less than the HR for running. So are the zones. My MaxHR for running is 155, so max HR for swimming must be around 130-135. Long story short, HR zones are different for different sports. That’s why Garmin gives an option for users to enter different MaxHRs zones for swimming, cycling and running

joelnx said:

I tried to adjust max HR and HR zones for swimming separately  although i hit on 4-5th zone,

joelnx said:

That’s why Garmin gives an option for users to enter different MaxHRs zones for swimming, cycling and running

« How you configure your personal heart rate zones does not impact advanced performance metrics such as VO2 max, training status, training load, load focus, or aerobic and anaerobic training effect feedback available on compatible Garmin devices. Overestimating or underestimating your maximum heart rate can, however, affect the reliability of these metrics. »

My FR245 doesn't have a separate HR Max for swimming, but I have no problem measuring aerobic efficiency compared to running or walking.

fr 245 does have a seperate HR for swimming:

https://www8.garmin.com/manuals/webhelp/forerunner245/EN-US/GUID-30C91919-943C-44E9-8048-901AC0881AEA.html

Thanks, I didn't know.