Field LT test

I read in one of these threads about doing a field LT test.  The problem is I don't recall which one or how long ago.  I've read several of the HRM related threads and some of the comments from the more experianced and less experianced are the same.  They say stay in a lower HR zone and build on that.

I am willing to try this as boring as it gets.  I feel as I am moving too slow.  However I figured slow runs, Z3 or lower from now untill Thanskgiving and then see what I can do.  Bike and swim when I can squeeze it in.

So back to the LT test, like I said I had a stress test several years back, maybe 4.  They said my max HR was 176.  I am assuming that was my max HR, as that was what the nurse increasing the treadmill was trying to get me to, before the echo.  I made 168 and I was on the table

Now I have read that once you get your HR really high, it should recover 20% in 2 minutes or less.   In March, maybe April of this year I took over 4 minutes.  This was reaching into the mid 150 range.  Now I am droping from the same mid 150 range in about 1 minute.

So figure I need to work off a LT level to tune in my zones.  There is no way I am going to pay a lab to do this.  In my line of work I could go in tommorrow and not have a job.  So after all this rambling I was hoping someone, could help me with this LT field test I read about sometime agao.

Thanks

Joe