For females this would usually be finished in about 1 hour 15minutes. For males this would be finished in about 1 hour. Olympic distance triathlon (1500m / 40m bike / 10km run) For females this would take about 2 hours 25mins. For males this would take about 2 hours. Half Ironman (1.9km swim / 90km bike / 21km run) Females usually take about 5 hours 30mins.
Zinc. Night blindness may also be the result of a zinc deficiency which reduces the activity of an enzyme that helps the body produce vitamin A (retinol dehydrogenase). Research has shown that taking a zinc supplement is helpful. Healthcare providers often recommend 15 - 30 mg of zinc daily for vision.
Vitamin B-9 also aids in the continual cell growth needed to give rise to new red blood cells, because it helps you metabolize proteins and DNA. A deficiency in either vitamin B-12 or vitamin B-9 can cause pernicious anemia, which can cause a rapid heart rate, weight loss, irritability and fatigue. Your diet should include 2.4 micrograms of vitamin B-12 and 400 micrograms of vitamin B-9 each day to prevent a deficiency.