This study aims at identifying the differences, correlative relations, and the contribution percentage between the biochemical variables according to the drinking stations of the Marathon race in Iraq 2018. The sample was (225) runners. They have been chosen intentionally through choosing the first runners who were five. The researcher used the descriptive approach and correlations. The findings of the study have a huge effect on the biochemical variables (Na.Ca.Mg.K). The effort of the race leads to the decrease of the level of the biochemical variables in comparison to the levels before the effort. But it remains within the natural boundaries during the effort according to the race power and burden.
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