Disciple wrote:
Youngsters tend to be anaerobically strong and aerobically weak. Picking a pace from a 5K PR can give an easy pace that is too fast. Much better to err on the safe side.
It is good advice to have an awareness of other coaches and methods. Note that the coach Hadd was quoted as saying that he would only begin training someone, once their mileage was up at 50 mpw. So, in the beginning, you can train to train.
So now we're done talking about Lydiard and we want to incorporate Hadd? Hadd and also Maffetone are modern-day / heart rate versions of Van Aaken.
There are no shortcuts. Quantity is important (thank you Lydiard) but not without quality and that quality during base training has an upper limit (thank you Lydiard) and a lower limit (thank you to scientists such as Seiler who have circulated the idea of ventilatory thresholds)
Ventilatory threshold #1 as defined by researchers is central to this discussion. Below VT your heart rate remains stable and decoupling does not occur. You are able to talk freely because your breathing is mild. This intensity, however, does not put any pressure on your cardiovascular system ala Lydiard. It does not force you to consume an increasing number of liters of oxygen per liter per minute up to the second lactate turnpoint ( LT 2). It's a good thing to let your heart rate drift upward because that provides a stronger stimulus to your aerobic engine.
I hope you realize that most of the top high school runners in the country are already running around 50 miles per week and LSD training was not part of their development.
Hadd training is good, as stated earlier, for someone coming off the couch with no athletic background, probably overweight, and highly prone to injury but that is not groundbreaking stuff. Lydiard formed a joggers club in New Zealand sixty years ago that catered to this demographic.
The other class of people who improve off the LSD approach are those who have always run too fast in training because they overestimate their aerobic fitness . The system forces them to slow down which takes the edge off their cooked central nervous systems and it follows they're able to run more consistently.
If our19:00 5K runner were to train at 70-80% of his vV02 max his paces would be roughly 7:20-8:30 mile. He would be touching on the faster end of that range during the latter portion of his runs (if he feels good) and during his other fartlek sessions . If he doesn't feel good he can default to a slower pace. No need to fixate on a number but those numbers are not "unsafe" as you suggest by any means. In fact, the majority of youngsters in 19:00 5K shape will probably find that to be too slow but that's where discipline comes in and a good coach will slowly increase their volume as the body adapts to that level of effort.