“I love a challenging climb as much as the next guy, but attacking from the bottom of a significant climb is rarely the best way to get to the top first. And even if you don’t care about getting to the top first, starting out too hard will make the climb harder and slower than it needs to be.
You increased your energy demand so abruptly that you generated a ton of lactate in working muscles. That lactate is always being reintegrated into normal aerobic metabolism and being broken down into usable energy in mitochondria. But when you generate a lot of lactate that process can’t keep up, contractile capability of muscle cells decreases, and your power output drops like a stone. Training can help you recover from this scenario faster, but in the second half of a sustained climb you’re unlikely to recover completely.”