Micronutrient Needs in Athletes Flashcards
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Which form of dietary iron has the highest bioavailability in athletes?
Answer: Heme iron from animal sources
Heme iron from animal sources is absorbed at 15–35%, far exceeding the 2–20% absorption rate of non-heme iron from plant foods.
What is the primary physiological role of vitamin D relevant to athletic performance?
Answer: Supporting calcium absorption and muscle protein synthesis
Vitamin D facilitates intestinal calcium absorption and plays a role in muscle protein synthesis and neuromuscular function, making it critical for bone health and muscle performance.
Which serum marker is the most sensitive indicator of iron stores in an athlete?
Answer: Ferritin
Serum ferritin reflects total body iron stores and is the earliest marker to decrease in iron depletion, though it can be falsely elevated during acute inflammation.
Female endurance athletes are at elevated risk for iron deficiency primarily due to which combination of factors?
Answer: Menstrual iron losses, foot-strike hemolysis, and sweat iron losses
Female endurance athletes face multiple routes of iron loss including menstruation, mechanical hemolysis from foot-strike, gastrointestinal micro-bleeding, and sweat losses.
What is the generally recommended daily calcium intake for adult athletes to support bone health?
Answer: 1000–1300 mg/day
Adult athletes are advised to consume 1000–1300 mg of calcium daily, aligned with general population DRIs, to support bone remodeling under the stress of regular training.
Sports anemia (dilutional pseudoanemia) in endurance athletes is best characterized by:
Answer: Apparent low hemoglobin due to plasma volume expansion with normal iron stores
Endurance training increases plasma volume proportionally more than red cell mass, diluting hemoglobin concentration without true iron deficiency—serum ferritin remains normal.
Which component is NOT part of the original Female Athlete Triad as classically defined?
Answer: Iron deficiency anemia
The classic Female Athlete Triad consists of low energy availability, menstrual dysfunction, and low bone mineral density; iron deficiency anemia is a related but separate condition.