All you HR fans, what have you found happens with your heart rates on your recovery runs? Increasingly I'm finding it hard to keep my HR high enough on my easy days. Unless I concentrate on running faster, my relaxed pace now works out at around 53-55% WHR which is too low to be of any benefit. Received wisdom seems to suggest it should be at least 60%. Or doesn't it matter on easy days?
Also, whilst I can understand the reason my HR is getting lower, why should it feel harder to run at the same intensity? I'd rather not have to feel I've got to concentrate on my easy days. What have the rest of you found? Is it subjective or objective anyway?