The anaerobic lactic energy system is where the muscles do not use oxygen and lactic acid is produced.Making the best of Energy production Different events require athletes to use combinations of the three energy systems.he anaerobic lactic energy system is where the muscles do not use oxygen and lactic acid is produced.
Photo Credit Michele D. Lee/Demand Media. Stir the ground beef every three to five minutes as it cooks in the skillet. Break apart the cooking meat with the spatula to get the chunks smaller if desired. Cook the ground beef for eight to 10 minutes or until no pink remains in the middle of the pieces. The USDA recommends cooking ground beef until it reaches an internal temperature of 160 degrees Fahrenheit.
Cooking times vary according to the weight of the roast, with larger cuts of beef taking longer to cook. A 9- to 11-pound frozen roast takes about 7.5 hours to cook to well-done. Cooking times also change according to doneness as well. The same size cut of beef takes about six hours and 45 minutes to cook to a medium-rare state.