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@Smallfurry
Your LTHR is basically the heart rate version of your FTP. The maximum HR you can maintain over an hour.
Mine is 163. Which isnt bad for a guy of my vintage.
My FTP is 266. Which, given my weight, isnt amazing for a keen cyclist. But I'm pretty happy about it.
As for your FTP. it sounds wrong. See this calculation, based on a you giving it the beans for the full distance.
FTP = 98.
Weight + bike = 13 Stone.
Distance travelled over 1 hour on a flat course with no wind < 15 miles.
Average speed = 14.8 mph.
Thats pretty darn slow.