I Think I Have My Lactate Threshold...What Next?

I wonder if anyone can help me. Thank you in advance! My goal is to improve my 400 meter freestyle. My time right now is 5:45. I am almost 44 years old. Coming off six weeks of doing only long, slow swims (2-3 miles) at 125 HR or lower, I performed a 3000 meter freestyle at maximum in an effort to discover my lactate threshold. My time was 47:29. Right afterwards my HR was 164, so I estimate it was probably around 170 during the actual swim. Average pace was as follows: 1:35 per 100 3:10 per 200 6:20 per 400 My first 400 was, to my surprise, a 6:02. So you can see I got slower later on. Is this a reasonable approximation if my lactate threshold? Should I start by training below this pace, say at 140 HR, then build to eventually holding 400 meter pace? Thank you for any advice you care to give. God bless!
Parents
  • Yesterday I intended to swim 2 miles at 140 HR. My plan is to start slow and move up the HR “ladder” a bit at a time. Unfortunately my HR was 152, 152, 148, and 144 the times I checked it (finger to neck, floating in the middle of the pool). I suppose I need to slow down! Not easy though. 125 HR I can do; 170 HR I can do. Hard to find the in-between. If anyone disagrees with this approach I’d love to hear it. Thank you!
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  • Yesterday I intended to swim 2 miles at 140 HR. My plan is to start slow and move up the HR “ladder” a bit at a time. Unfortunately my HR was 152, 152, 148, and 144 the times I checked it (finger to neck, floating in the middle of the pool). I suppose I need to slow down! Not easy though. 125 HR I can do; 170 HR I can do. Hard to find the in-between. If anyone disagrees with this approach I’d love to hear it. Thank you!
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