Smoove wrote:
What added phsysiological benefit comes from a 15:00 5k runner running at 6:10 pace instead of 6:40 pace? Especially if you subscribe to a Daniels approach to training, faster does not necessarily mean faster.
I'd also make a distinction between men and women. I think it is far more common for decent but non-elite women (18:00-20:00 5k runners) to run too fast than it is for them to run too slow.
We're discussing the easy pace range that the VDOT calculator spits out. For a 15:00 5k runner, that's 6:19-6:42. So I see nothing wrong with that runner doing 6:40/mi on easy days. 6:10 would be too quick in general, but 15:00 runners still won't find 6:10 to be difficult. That's why I was surprised people found Daniels' easy pace to be too fast earlier in the thread.
The problem is that a lot of people seem to think a 15:00 5k runner is making the right choice by running 7:30+/mi even if their legs feel good. Some of this can't be helped since a lot of runners are on a team and want to run easy with their teammates who are significantly slower than them, and I truly believe that's valuable and should be done every now and then because there's more to running than being a physiological robot, but not 4 days out of the week.
Running faster relative to your fitness level stresses your cardiovascular system more, but at the intensity Daniels prescribes, there still isn't much anaerobic energy contribution at all. The more you can stress the upper end of your aerobic metabolism, the more efficient it will become.