HNU 363 Lecture Notes - Lecture 21: Amenorrhoea, Injury Prevention, Blood Plasma
Document Summary
Factors that could increase need: decreased absorption from gi tract. Increased turnover, metabolism, need for tissue turnover and maintenance. Factors that could decrease need: decreased excretion in urine, more effective recycling processes. Effect of exercise is presumed to be small. Mild deficiency: low intake or adequate intake but low absorption. Initial decline in vitamin related enzymes (rarely measured outside the research setting) Continued decline in vitamin related enzymes (infrequently measured) Low b1, b2, b3 intakes associated with low energy intake: cofactor in atp production, needed to create energy, more does not result in more coenzymes. Supplements not likely to improve performance: b6 increased turnover and loss, rda: 1/3 mg/d, athlete: 2. 0-3. 0 mg/d. Increased losses liberated more/used more increased requirements: release glucose from glycogen (plp) Prevalent in skeletal muscle cells: critical roles in amino acid metabolism and glycogen breakdown. Low b6 intake is associated with low energy intake: b6 is found in protein-containing foods and green, leafy vegetables.
