I agree with the high intensities vs. long, low intensities. But in the
past I was able to do that without a power meter.
My speed capability increased most significantly after I moved to a
place where my ride home from work included a couple miles of mandatory
uphill. I attacked the hill as a challenge, hurting myself to keep my
speed up. And after a few years I was quite a bit faster.
On the other hand, when we did 4000 miles coast to coast, we didn't
push, we cruised. My wife was hopeful that on our return she'd be able
to keep up with faster club rides, but the long ride seemed to make no
difference. I think it's because she never pushed herself to the point
of pain.
Vaguely related, I recently read an article about weight lifting for
strength training. It addressed the question of whether it's better to
do lower weights with lots of repetitions, or heavier weights with fewer
repetitions. The article claimed that recent studies show it doesn't
matter - that as long as you work a muscle to the point where you can't
do one more repetition, you get the same strength benefit. The key is
pushing yourself to exhaustion. Without that, there's little or no
strength gain.
--
- Frank Krygowski