There is, however, little research documenting how dehydration impacts individuals undergoing dialysis. Specifically, few studies have assessed the link between (de)hydration and frailty, although better physical function has been associated with a higher pre-dialysis BP, which may simply reflect better hydration. Experience from the Wessex Kidney Centre suggests that dehydrated dialysis patients suffer from increasing intradialytic symptomatology and a prolonged dialysis recovery time, during which they complain of prolonged fatigue. However, no studies have documented whether improving the hydration of dialysis patients improves not only their intra- and interdialytic symptomatology, but also their physiological/cognitive function, fatigue, physical (in)activity and, ultimately, QoL. Establishing the relationships between dehydration and these outcomes is essential, since hydration status can be easily and rapidly adjusted. One reason there is limited research in this area is that hydration status of individuals undergoing dialysis is difficult to objectively assess, which itself warrants further investigation.