It is this build up of lactic acid that causes the pain, heaviness, feeling of exhaustion, deadened muscles, and 'muscles will not work or go any faster' sensation. I am also interested in this idea because in horses there is a condition known as azoturia (tying up), which does not have an obvious human parallel.
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A hub network is a simple ethernet network that features a computer or two and an ethernet cable. Hub networks are set up to share files or print them, but they are not used with regard to Internet connection. In cases involving hub networks, routers are often used (when small distances are at play).