Posted: 19/09/2014 at 13:15
Dachs as I'm now working to HR then the answer is yes but as you rightly say if I'm feeling fatigued pace may not be as sharp as if a one off threshold.
I was being a bit tongue in cheek as I've only done this 3 times in the last 6 months normally it's a 45 min threshold followed by speed session !
When I did do it came out on both threshold runs at 5.52 pace then 5*1k Ave 3.08!! but that was a few weeks before my 5K "Old fart" PB
I am doing 2 thresholds per week and 1 speed session but not necessarily back to back at the moment