Originally Posted by GhostRider62

Fitness is a combination of leanness and power specific to the type of riding you intend. Most humans do not achieve their potential for many reasons, it takes many, many years of dedicated training.

348 watts for 5 minutes is nothing. IIRC, it is corresponds to a FTP of 310-315. Good solid Cat 3 in the day. No racing anymore. Just to make sure I was not lying, I went into GoldenCheetah. It was 357 watts for 4:59 and 317 watts for 34:45. I can give you the phone number of my sports cardiologist if you want to talk to him. Most Pro 1/2 would be well over those figures. I recall reading A. Coggan saying that with years of dedicated training the average human could get to just about 4W/Kg or 300 watts.

Again. the point of my post was to say, low HR for an older person does not necessarily mean low power. If you wish to say my power was only 280 or 260 watts, fine. It was at 137 bpm and on a sub 20 minute 10 mile TT. I am going to do some sprint training today, have a good day.