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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'MIC - Mortgage Investment Corporation', All Acronyms, 19 August 2017, <https://www.allacronyms.com/MIC/Mortgage_Investment_Corporation> [accessed 19 August 2017]