Serial Energy Availability and the IOC REDs CAT2 Severity Gradient: A Prospective Validation Study in Tier 3–4 Athletes
This prospective validation study demonstrates that serially measured energy availability tracks the IOC REDs CAT2 severity gradient, confirming lower energy availability in athletes classified with REDs—particularly in weight-sensitive sports and males with suppressed testosterone—while noting that findings remain hypothesis-generating due to sample limitations.