GLOSSARY

Exercise-Induced Hemolysis Destruction of red blood cells associated with exercise under particular mechanical or physiological conditions.

Iron assessment distinguishes depleted stores, iron deficiency without anemia and iron-deficiency anemia. Ferritin is useful but rises with inflammation, and hemoglobin can change with plasma volume. An endurance-trained athlete may have dilutional lowering of hemoglobin without true iron depletion, yet training does not exclude genuine deficiency. Consider diet, bleeding, absorption, recent illness and exercise when interpreting tests. Confirm the problem and investigate its cause before treatment; repeated unsupervised iron use can obscure the issue and create unnecessary risk.

Anemia describes reduced blood oxygen-carrying capacity within a clinical diagnostic framework and has multiple causes. Iron deficiency, vitamin deficiencies, inflammation and blood loss require different assessments and treatment. Ferritin is influenced by inflammation, and fatigue alone does not establish iron deficiency. Do not start high-dose iron simply because an athlete reports poor performance. Evaluate the cause and relevant laboratory findings, particularly when symptoms persist, dietary intake is limited or blood loss is possible.

A recovery biomarker quantitatively relates to intake or expenditure under a specified balance model, whereas a concentration biomarker is influenced by absorption, metabolism and other factors. Predictive biomarkers use a calibrated relationship that may depend on the studied population. Distinguish intake biomarkers from markers of tissue status, function or disease. Blood, urine and tissue measurements answer different questions. Sampling conditions, recent exercise, hydration and inflammation can affect interpretation; no single biomarker provides a complete nutritional assessment or proves the cause of poor performance.

For example, low hemoglobin in an endurance athlete can reflect iron deficiency or plasma-volume expansion, among other causes. Review appropriate blood indices, ferritin and clinical context before treatment. Track the confirmed problem and its cause rather than repeatedly prescribing iron whenever training feels difficult.

An adequate diet provides sufficient energy and essential nutrients while fitting health needs. A high score for variety or a healthy food label cannot independently demonstrate adequacy. Review what is actually eaten, including foods excluded and suitable replacements. Athletes can consume many vegetables yet still lack enough energy or carbohydrate for training. Assess the overall pattern, distribution and relevant nutrient risks rather than assuming that a single food or supplement makes the entire diet balanced.

Nutrient status reflects intake, absorption, distribution, stores, losses and physiological demand. A normal blood concentration may not exclude depleted stores, while an abnormal result can have non-nutritional causes. Calcium in blood, for example, does not directly measure dietary calcium adequacy or skeletal reserves. Different nutrients require different assessment strategies. Select tests for a defined clinical question and interpret them with symptoms, diet, relevant disease and sampling conditions instead of ordering a broad panel and assuming every number is a performance target.

Nutrition follow-up compares intended goals with actual intake, symptoms, function, relevant measurements and the person's experience. Specify the time frame and what would justify adjustment, continuation or referral. A treatment response can be beneficial, absent or adverse, and adherence alone does not prove effectiveness. Retain enough documentation to understand what changed. For an athlete, consider health and training quality alongside body mass or laboratory results so that apparent progress in one measure does not hide deterioration elsewhere.