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.
Around 24 hours, but no more than that.   It isn't going to be safe to eat until it is cooked. For best quality, ground beef should be cooked within 2 days of purchase. Fre â¦ eze the meat if you won't be able to use it in that time frame.