GLOSSARY

Waist-to-Hip Ratio Reference Table

Waist measurements require a standardized site and an appropriate population reference; ratios do not replace clinical assessment.

Waist Circumference A standardized abdominal girth measurement used in appropriate risk or anthropometric assessment.

Growth assessment compares accurate serial measurements with an age- and sex-appropriate standard or reference. Confirm exact age, measurement technique and the chosen chart. A percentile describes relative position; a z-score describes distance from the reference distribution under that chart's model. A change in trajectory can warrant assessment without establishing one nutritional cause. Adult body-mass categories do not transfer directly to children. For young athletes, interpret growth together with maturation, health and intake rather than treating a low body mass as evidence of superior fitness.

Repeated measurements become more informative when timing, clothing, scale, hydration and recent intake are comparable. An average can reduce random daily noise, but it can also conceal rapid changes that need attention. Keep individual values available and relate the trend to symptoms, food and training. Monitoring should have a clear purpose and appropriate frequency. More frequent weighing or scanning is not inherently better, especially if it increases distress or encourages restrictive eating without improving decisions.

For example, serial measurements made with different methods can create an apparent change that is partly procedural. Check equipment, posture and timing before interpreting the trend. In a young athlete, compare growth with the appropriate chart and developmental context rather than an adult weight-category target.

Validity concerns whether a method estimates the intended quantity accurately, while reliability concerns consistency on repetition. A method can repeat well while remaining biased. Technical error and prediction error also describe different sources of uncertainty. Small changes should be interpreted relative to relevant measurement error, with the same protocol used over time. Agreement at group level does not guarantee close agreement for every individual athlete, and switching instruments can create an apparent change that is methodological rather than biological.

A body-composition index expresses a component relative to a body-size measure, often height squared, while a ratio compares specified quantities directly. State both numerator and denominator before interpreting the result. Different skeletal muscle index definitions are used in different settings. A convenient normalization does not automatically remove every body-size effect or establish a sport-specific target. Reference values, measurement method and the population being assessed determine whether a comparison is meaningful.

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.

A nutrition care record should explain the assessment, interpretation, agreed plan, responsible professionals and follow-up criteria. Separate reported information from measured findings and clinical judgments. Record relevant units, dates, methods and changes so that another practitioner can understand the decision. Seek consent for sharing sensitive information and limit access appropriately. A referral should communicate the specific concern and urgency rather than only a broad label. In sport, documentation should support continuity of care while protecting health information from inappropriate use in coaching or selection.

Table references: www.who.int · 1