Table 3.

Blood and plasma volume changes

Time After Rehydration, h Trial 0%Trial 1%Trial 2%Trial 4%P Value
Blood volume change
Pre5.2 ± 2.3 4.9 ± 2.0 5.3 ± 2.05.1 ± 3.1 0.994
Post 0.00.0 0.0 0.0
0 5.9 ± 3.23.4 ± 2.7 4.6 ± 2.4 2.2 ± 1.10.101
1 5.8 ± 2.4 3.9 ± 1.33.2 ± 1.5 2.1 ± 1.6 0.013
24.2 ± 2.0 4.0 ± 2.3 2.9 ± 2.31.9 ± 2.6 0.323
4 5.4 ± 1.94.2 ± 1.1 4.1 ± 2.0 2.9 ± 1.90.147
6 5.0 ± 2.0 4.2 ± 1.13.4 ± 1.6 3.1 ± 1.9 0.232
Plasma volume change
Pre 7.6 ± 3.4 7.0 ± 2.48.4 ± 4.3 7.4 ± 4.5 0.928
Post 0.0 0.0 0.0 0.0
09.0 ± 5.3 4.9 ± 4.4 6.7 ± 4.22.9 ± 2.6 0.111
1 8.4 ± 3.85.5 ± 2.2 5.0 ± 2.4 3.2 ± 3.30.050
2 6.1 ± 2.7 5.9 ± 4.35.1 ± 4.5 2.6 ± 4.1 0.409
49.0 ± 3.2 6.5 ± 2.3 7.6 ± 4.34.4 ± 3.1 0.138
6 8.1 ± 3.17.4 ± 2.7 6.0 ± 3.4 5.3 ± 3.40.452
  • Values are means ± SD given as percent change from postexercise value. Samples were taken immediately before (Pre) and 30 min after end of (Post) dehydration period and then at 0, 1, 2, 4, and 6 h after end of rehydration period. Statistical differences are described in the text.