i coach a girl, a woman actually as she is 43 and has been training seriously for 17 years for 800 1500. Her coach died last year of asbestos poisoning and i have taken over her training.
Anyway following Lydiard and all i got her to do her steady runs at 155bpm of thereabouts. She mainly did them at that pace unless feeling underpar. She ended up doing 3 of them for 2 weeks out of 3 throughout the last 27 weeks. She also did many 30 and 40 mins runs at 120-130bpm and other 30 or 40 min runs anywhere between 130 and 150bpm depending on her feeling on that day. The 120-130bpm runs were called recovery runs adn the 130-150bpm were called easy runs. She also did a long Sunday run as if it was an easy 130-150bpm run and this ended up at 2 hours.
not long ago we started the distance runs for time yet still capped at 155bpm. She never broke that rule throughout the entire 27 weeks.
Anyway last week i said now you are allowed to go over 155bpm.In fact go over 160 and see where you end up as long as you maintain evenish pace for the entire distance (was 14km).
She ended up averaging 168 bpm and finished the distance 4 mins ahead of her best previous time. She continued and ran another 1km on the final 4 minutes. She also said she felt great.
Out of those entire 27 weeks this was evidence enough of the overflow effect of the aerobic development adnd Arthur's way. NOw the 60 min steady run tomorrow is to be run at 160bpm and possibly the one after will be at 165bpm.
the best part - she is so happy.