ABSTRACT
This chapter aims to low energy availability develops and can be assessed in an applied setting. The term relative energy deficiency in sport (RED-S) only broadens the potential impact of low energy availability compared to the Triad, but it also allows the syndrome to be applied to male athletes who may also experience a number of the same physiological consequences. One of the main reasons for the development of the RED-S framework is to ensure that research in males at risk or with low energy availability is increased. The Female Athlete Triad provides a medical framework that describes three inter-related conditions that each exist on a continuum from normal/optimal to serious endpoints. Despite there being a lack of research around RED-S, the concept has most certainly raised awareness in the running and coaching community of the health and performance consequences of low energy availability.
