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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The public switched telephone network is the aggregate of the world's circuit-switched telephone networks that are operated by national, regional, or local telephony operators, providing infrastructure and services for public telecommunication. The PSTN consists of telephone lines, fiber optic cables, microwave transmission links, cellular networks, communications satellites, and undersea telephone cables, all interconnected by switching centers, thus allowing most telephones to communicate with