Cardiac electrophysiology during progressive and controlled dehydration: inferences from ECG analysis during steady-state exercise and recovery

Citation data:

Page: 212-214

Publication Year:
2009
Usage 823
Downloads 694
Abstract Views 129
Repository URL:
http://ro.uow.edu.au/hbspapers/186
Author(s):
Peoples, Gregory E; Brown, M.; van den Heuvel, Anne M.J; Kerry, Pete; Taylor, Nigel A.S.
Tags:
dehydration; inferences; ecg; analysis; steady; state; exercise; recovery; cardiac; during; electrophysiology; progressive; controlled; Arts and Humanities; Life Sciences; Medicine and Health Sciences; Social and Behavioral Sciences
lecture / presentation description
When fluid intake is insufficient to match sweat losses, dehydration develops. It is well established that dehydration impacts unfavourably upon cardiovascular function, including cardiac output and peripheral blood flow (Gonzalez-Alonso et al., 1998). However, the limitations of cardiac electrophysiology in the dehydrated state are not known. In light of possible electrolyte imbalances, particularly when water deficit moves towards 7% of total body mass, it is worth considering the possibility of adverse conduction changes, as reflected within the electrocardiogram (ECG), may accompany electrolyte loss. In addition, the ECG can also be employed to investigate other cardiac limitations, such as myocardial ischaemia. Thus, in this project, set amongst a large dehydration study, basic cardiac conduction measures, and indicators of myocardial ischaemia (ST segment) were evaluated across a wide range of dehydration levels (1-7% water deficit).