Ironman triathletes must complete the bicycle course at the World Championships in 10 hours, 30 minutes. The top women, however, will finish the bike race in about half that time. As with the swimming cutoff, failure to achieve the bicycle cutoff time eliminates the triathlete from the event.
In the past, the requirements for vitamin K only considered its classical function in coagulation; an RDA was given for vitamin K in the United States (54, 58) and a safe and adequate intake level was given in the United Kingdom (65).
  Vitamin K:   The primary function of vitamin K is to regulate normal blood clotting. The vitamin is important for the production of prothrombin, a protein essential for blood coagulation.   Vitamin K is found in green or leafy vegetables, such as broccoli, turnip greens, romaine lettuce and cabbage. The platelets form what is called a platelet plug and effectively surround the damaged tissue. 2  Here is the most complex bit, the contact between collagen and the blood causes the blood to change: 3  The soluble plasma protein Prothrombin is turned into Thrombin which is an enzyme.