Iron as an ergogenic aid: ironclad evidence?

Area of Science:

• Sports Medicine
• Nutritional Science
• Exercise Physiology

Background:

• Athletes may experience iron deficiency due to inadequate dietary intake, blood loss, or increased demands from intense physical activity.
• Iron deficiency anemia in athletes is linked to performance decrements, with supplementation showing clear benefits.
• The role of iron supplementation in iron-depleted but nonanemic athletes remains debated.

Purpose of the Study:

• To evaluate the efficacy of iron supplementation in improving athletic performance among iron-depleted nonanemic athletes.
• To review the current evidence regarding iron status monitoring and supplementation guidelines for athletes.
• To determine if iron supplementation is justified solely for performance enhancement in nonanemic athletes with depleted iron stores.

Main Methods:

• Systematic review of existing literature on iron supplementation and athletic performance.
• Analysis of studies examining iron-depleted nonanemic athletes and their response to iron intake.
• Examination of common methods for assessing athlete iron status, such as serum ferritin levels.

Main Results:

• Athletes with iron deficiency anemia demonstrate improved performance with iron supplementation.
• Evidence supporting performance enhancement through iron supplementation in iron-depleted nonanemic athletes is contradictory.
• There is no consensus on standardized ferritin levels for recommending iron supplementation or on optimal maintenance levels.

Conclusions:

• Iron supplementation is beneficial for athletes with iron deficiency anemia.
• Supplementation for iron-depleted nonanemic athletes is not currently justified solely for performance improvement.
• Screening and education on balanced nutrition are recommended for at-risk athlete populations, particularly endurance and female athletes.