New Threshold. What does it mean?

Do you mean lactate threshold?
If you run with HRM strap it is detected automatically, in manual there is a lot information about it:
- https://www8.garmin.com/manuals/webhelp/forerunner935/EN-US/GUID-3ED97FFE-025E-47EA-9C70-DD86156617BD.html
- https://www8.garmin.com/manuals/webhelp/forerunner935/EN-US/GUID-F5BF67CE-C94E-4842-AE96-A7A05C85B732.html
- https://www8.garmin.com/manuals/webhelp/forerunner935/EN-US/GUID-0EDC68E3-D886-48D2-B624-AA634739B421.html

I guess that that is what I am asking. See photo.
I do not know how to interpret this information. As in, it is good or bad.ciq.forums.garmin.com/.../1425476.jpg

That would mean your LTHR, is 165 bpm, and your LT pace is 8 min, 20 seconds per mile. Pace is a metric where lower is better, so the green down arrow means you have improved since last time your LT pace was detected.

Runners generally use Pace (ie. minutes per km or mile) as a metric, but if you prefer the watch to display Speed (ie. miles or km per hour), you can change it in Settings> System> Format> Pace/Speed Preference.

Also, you can use the measured lactate threshold heart rate to set your heart rate zones. This is supposed to give more accurate zones than max. heart rate, because a lot of the training effects we are trying to achieve will happen just around your lactate threshold.

That would mean your LTHR, is 165 bpm, and your LT pace is 8 min, 20 seconds per mile. Pace is a metric where lower is better, so the green down arrow means you have improved since last time your LT pace was detected.

Thanks for the reply. I guess that I was confused as to what the arrow was signifying. A worse threshold or a lower time.
Does anyone know of a place other than taking pictures of my watch that I can view the history?

If the number were bad (ie. a decrease in performance), the arrow would show up red.

In my opinion, heart rate zones are good, but zones based on your threshold pace are better and a more accurate indicator of how well you trained that day. Your heart rate can easily be affected by a number of things (sleep, caffeine, weather conditions). Also, every run workout shouldn't reach your maximum heart rate. Every workout shouldn't be a steady pace either. Both these variations make it difficult for a fitness watch to calculate your threshold pace.

I would encourage you to do a lactate functional threshold pace (FTP) test. Run one mile at your hardest consistent effort (a pace you can hold steady for the entire distance). The time you finished is your FTP.

If you have any questions, feel free to reach out to me. I have a YouTube channel where I post lots of informative & entertaining videos that talk about running, swimming, and cycling. https://www.youtube.com/watch?v=u3hwFB8-ZuQ&t=226s