Hypohydration can impair the performance of exercise, and fluid balance is therefore
of importance to athletes. This thesis aimed to investigate factors regarding fluid
losses and gains, with a view to the performance of exercise.
Chapter 3 investigated the effect of ingesting 600ml of hypotonic and hypertonic
glucose solutions on blood, plasma and red cell volume in resting individuals.
Ingestion of 6% and 12% hypertonic glucose solutions showed evidence of a transient
decrease in blood and plasma volume possibly due to fluid movement into the
intestinal lumen from the body. There was also a suggestion that ingestion of a 2%
glucose solution increases blood and plasma volume in comparison to a 0% glucose
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.