Acid building up in exerted muscle

adjective

1. Of or relating to milk
2. Obtained from sour milk or whey
3. Involving the production of lactic acid

noun

1. A hygroscopic organic acid C₃H₆O₃ present normally especially in muscle tissue as a by-product of anaerobic glycolysis, produced in carbohydrate matter usually by bacterial fermentation, and used especially in food and medicine and in industry

noun

1. Any of a group of isoenzymes that catalyze reversibly the conversion of pyruvic acid to lactic acid