rojo wrote:
I enjoyed the video but he said in it that he thinks Kipchoge's HR is 140 at the beginning of the marathon. Really? That seems WAY low to me.
What do most people have the HR at during a marathon? When I was competing no one had a HR watch so I don't know.
140 in the first few k's of a marathon is a pretty good guess. Kipchoge's max HR will be very low due to exceptional blood volume and a really strong heart / big left ventricle size, I assume it would be around 170. MP is normally around 84-87% of max HR for a runner, for an elite like Kipchoge it will be higher, around 90% which is closer to threshold (for normal person, 88-92%, for elite marathoners threshold is at 90-94% of max HR).
I think he starts at 140, slowly getting up to spend most of it in the high 150s, 160, and finishing in mid 160s.
Keep in mind, while lots of aerobic and threshold training will decrease max HR, it is still highly individual - so Kipchoge could have his max HR at 170 or 175, but the % of his threshold and MP would just be the same as for other very well trained elite runners.
Amateur runners often have higher max HR's (low blood volume, etc) but run a marathon at a MUCH lower % of their max HR - they can't sustain the same intensity as elites, even if you would cap their marathons to a 125 minute run like elites. So Kipchoge might do 160 HR at 90% of his max, whereas a recreational runner is doing 125 minutes at only 85% of his max, but also with 160 HR because his max is higher.