Great question — answering as the UphillTech team:
“Hitting the wall”, or "pinging" is colloquial for having your heart rate bouncing off your Max Heart Rate (MHR). Being overly out of breath and head-dizzy are symptoms. “Bonking” is colloquial for when your muscles run out of glucose-etc. Your entire body aching – especially your shoulders – is a symptom. These are two very distinct feelings; but are somewhat interrelated. Sounds like you're suffering from the first. In my experience the first can start to happen more dramatically (noticeably) as you get older – “older” as in 36yo mind you : / I had the first example above happen so bad one time in Santa Cruz that I had to get off my bike and walk. I had had plenty of food, and absolutely...
Full answer by ipso: https://sports.stackexchange.com/a/5482 (CC BY-SA 3.0).
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