I would agree having had success on high and low mileage...but there are a few things to consider.
I think a lot of people against high mileage may be doing it wrong - it takes a different mindset (you have to be patient). You have to run much of it easy. You will probably need to run slower than you are normally used to. You probably won't get instant results - it takes time.
For those getting injured. I don't think high mileage itself causes injuries. Its more likely not listening to your body is the cause
- you have to eat right (stress fractures are more a result of poor nutrition)
- you have to recovery (meaning you can't set an arbitrary goal of X miles and expect it to work - this will lead to break down because you are not listening to your body). You do day-to-day. If one day you feel bad, or have pain then you take the day off of cut back.
When i spend a summer ave 160 I started with the goal of hitting 140, but had to accept that it would happen when it happened. the first few weeks I kept getting around 120 because i was having some Achilles pain. But because I listening to my body and took the day and half off each week, I did not get injured and once the pain cleared, I did hit 140.
The main thing I did was i took a day or 1/2 day off whenever i felt i needed it. This is very important. you have to be able to find the difference between being tired and needed a day off to recovery. Some of it is trail and error.
You have to lay the background for it. I started a whole year out slowly adapting:
- in the fall I experimented with going slower and longer on a single run - up to 20 at about 8:00 pace. This was so tough for me. These were torturous runs for someone who likes to go fast.
- then I experimented with doing two longish days back-to-back
- then in Winter I had one stretch where all I did was long easy days for 9 days in a row
(I did not know what to expect or have any preset distance goals in mind...I expected to be tired and slower as each day passed) I actually ended up doing 20 miles each day and held about the same pace. My log says these were 6:40-7:00, but even that seems too fast to me now.
- it was not until the following Summer that I was now ready to boost my mileage to consistently over 100, and this is coming from a low mileage runner who ran 800+ in college, and someone who hated long runs, and avoided them in college and after for years.
another thing that helps me cope with long slow running is making sure I do my faster days. I will be tired at first, so the quality will suffer, but it sure helps break up the boredom of long runs till you get used to them.