%0 Journal Article
%T IMMEDIATE RE-HYDRATION POST-EXERCISE IS NOT COINCIDENT WITH RAISED MEAN ARTERIAL PRESSURE OVER A 30-MINUTE OBSERVATION PERIOD
%A Bartholomew Kay
%A Brendan J. O'Brien
%A Nicholas D. Gill
%J Journal of Sports Science and Medicine
%D 2005
%I University of Uludag
%X This investigation assessed the effects of immediate or delayed re-hydration post-exercise, on mean arterial blood pressure (MAP) and on blood plasma volume (PV) expansion post-exercise. It was hypothesised that fluid ingestion would raise MAP and attenuate PV expansion. On two occasions separated by seven days, eight males (age 20.4 ¡À 1.7 years, mass 79 ¡À 5 kg [means ¡À SD]; VO2max 48 ¡À 11 mL¡¤kg-1¡¤minute-1, [mean ¡À SE]) cycled in the heat (35oC, 50% relative humidity) at a power output associated with 50% VO2max, until 1.0kg body mass was lost. 1L water was given either immediately thereafter, or two hours post-exercise by random assignment. On both occasions, MAP was calculated every five minutes for a period of 30-minutes post-exercise, and change in PV was calculated 24-hours post-exercise. Repeated measures ANOVA for MAP results suggested a low probability of a treatment effect (p = 0.655), a high probability of a time effect (p = 0.006), and a moderately high probability of a time x treatment interaction (p = 0.076); MAP tended to be lower when fluid had been consumed. PV expansions 24-hours post-exercise were not significant changes with respect to zero, and were not significantly different by treatment condition. In conclusion: (a) The exercise was not sufficient to elicit significant PV expansions; thus, we were unable to determine the effects of the timing of post-exercise re-hydration on PV expansion. (b) The hypothesis regarding MAP in response to drinking was not supported, rather there was a 92% probability that the inverse affect occurs
%K Dehydration
%K re-hydration
%K blood pressure
%K plasma volume
%U http://www.jssm.org/vol4/n4/8/v4n4-8text.php