Iron Metabolism and Athletic Performance

Iron is central to oxygen transport, energy production and mitochondrial function, underpinning endurance, strength and recovery in athletes. Dietary iron is absorbed in the duodenum, stored in ferritin complexes and mobilised via the iron exporter ferroportin. Exercise alters systemic iron homeostasis through inflammation-driven hepcidin release, reducing iron export and impairing erythropoiesis. Endurance training heightens iron turnover through repeated mechanical haemolysis, sweat and gastrointestinal losses, while female athletes face additional menstrual iron depletion. Insufficient iron lowers haemoglobin concentration, diminishes oxygen-carrying capacity and impairs VO₂max, whereas iron overload can induce oxidative damage in muscle and other tissues. Practical strategies to maintain optimal iron status include dietary modulation with haem-iron sources, timing of nutrient‐rich meals to enhance absorption, and judicious supplementation when dietary intake is inadequate. Individualised monitoring of ferritin, haemoglobin and inflammatory markers is vital for early detection of suboptimal iron status. A holistic approach, balancing training load, nutritional intake and recovery, supports global athletic populations in maximising performance and health.

Research from Nature Portfolio

A large cohort study of military personnel investigated the association between mild anaemia (haemoglobin 10.0–13.9 g/dL) and physical fitness. Mildly anaemic individuals were significantly more likely to rank among the poorest performers in a 3 000 m run, indicating compromised aerobic capacity. In contrast, performance in short‐duration strength tests such as push-ups and sit-ups was unaffected or even slightly enhanced, suggesting that mild reductions in haemoglobin primarily impair endurance rather than anaerobic activities. These findings underscore the nuanced impact of low‐grade anaemia on different components of physical fitness and reinforce the need for targeted screening and intervention in active populations.

Iron Metabolism and Athletic Performance publication trend

The graph below shows the total number of articles in iron metabolism and athletic performance across all publications each year (not limited to Nature Index journals).

Technical terms

Haemoglobin: Oxygen-binding protein in red blood cells.

Hepcidin: Liver-derived hormone that degrades ferroportin, regulating iron export.

Ferritin: Intracellular protein that stores and releases iron.

VO₂max: Maximal rate of oxygen consumption; key indicator of aerobic fitness.

Ferroportin: Cellular iron exporter controlled by hepcidin.

References

1. Considerations for the Consumption of Vitamin and Mineral Supplements in Athlete Populations. Sports Medicine (2023).
2. Long-term iron supplementation combined with vitamin B6 enhances maximal oxygen uptake and promotes skeletal muscle-specific mitochondrial biogenesis in rats. Frontiers in Nutrition (2024).
3. The IRONy in Athletic Performance. Nutrients (2023).
4. Association between mild anemia and physical fitness in a military male cohort: The CHIEF study. Scientific Reports (2019).