Micronutrient Needs in Athletes Flashcards
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Why are B-vitamins particularly important for athletes with high training loads?
Answer: They serve as coenzymes in carbohydrate, fat, and protein energy metabolism
Thiamin, riboflavin, niacin, B6, B12, and folate function as coenzymes in metabolic pathways that generate ATP from macronutrients, and requirements may increase modestly with high energy expenditure.
Which micronutrient deficiency is most strongly associated with impaired immune function and delayed wound healing in athletes?
Answer: Zinc
Zinc is essential for lymphocyte development, neutrophil function, and tissue repair; even marginal deficiency impairs immune responses and recovery from training stress.
High-dose antioxidant supplementation (e.g., vitamins C and E) in athletes may:
Answer: Potentially blunt beneficial training adaptations such as mitochondrial biogenesis
Reactive oxygen species generated during exercise serve as signaling molecules for adaptations; high-dose antioxidants can quench this signal and may attenuate gains in mitochondrial biogenesis and insulin sensitivity.
Which vitamin is essential for red blood cell maturation and is of particular concern for vegan athletes?
Answer: Vitamin B12
Vitamin B12 is required for DNA synthesis and erythrocyte maturation; because it is found almost exclusively in animal-derived foods, vegan athletes require supplementation or fortified foods.
Magnesium contributes to athletic performance primarily through its role in:
Answer: Energy production (ATP synthesis), protein synthesis, and muscle contraction regulation
Magnesium is a cofactor in ATP hydrolysis and synthesis, participates in protein synthesis, and regulates ion channels involved in muscle and nerve function, making it indispensable for exercise.
Athletes training in hot environments have increased requirements for which micronutrient primarily because of sweat losses?
Answer: Sodium (and other electrolytes)
Sweat contains significant sodium, and heavy prolonged exercise in heat can lead to large electrolyte losses, increasing requirements and risk of hyponatremia if replaced with plain water only.
Riboflavin (Vitamin B2) requirements may be modestly elevated in athletes because it functions as:
Answer: A coenzyme in oxidative phosphorylation and the electron transport chain, which intensifies with training
Riboflavin is a precursor to FAD and FMN, coenzymes central to the electron transport chain; increased aerobic metabolism with training may modestly raise riboflavin needs.