Calculating LT1 and LT2 approximately without a blood test?

Hello,
in my DFA Alpha 1 records i can see some extrasystoles, especially when my puls / power changes (goes up or down). In this example i did a 3 minute All-Out effort.
The green line is the power output, and the black dots are the RR-Intervals (millisecounds between heart beats).
Still have been at the doctors and everything should be ok so far with my heart. Extrasystoles are “normal”.

Anybody of you recognizes something like this?