The best swimmers among female Ironman triathletes complete the swimming portion of the event in 50 minutes to an hour. At the World Championship, the cutoff time for all competitors is two hours, 20 minutes. Any participant who fails to complete the 2.2-mile swim within that time is eliminated from the competition.
There are two sources of this essential vitamin, including vitamin K1, or phylloquinone which is primarily found in green leafy vegetables and vitamin K2 or menaquinone which is synthesized by certain intestinal bacteria.
Description. Vitamin K is found in several forms: Vitamin K-1 (Phylloquinone), the form occurring naturally in plants; Vitamin K-2 (Menaquinone), the form produced by intestinal bacteria and also derived from putrefied fish meal; synthetic vitamin K (Menadione).Vitamin K is integrally involved in the clotting mechanism of blood.ecause vitamin K is common in many foods and is also synthesized by intestinal bacteria, deficiency in humans is unlikely to occur under normal conditions.