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@hippy
http://journals.lww.com/acsm-msse/Abstract/publishahead/The_effects_of_dehydration_during_cycling_on.98672.aspx
Conclusion: Progressive dehydration significantly increased HR, Tc, RPE, Pvol loss, whole body CHO oxidation, and muscle glycogenolysis, and these changes were already apparent in the first hour of exercise when BM losses were <=1%. The increased muscle glycogenolysis with DEH appeared to be due to increased core and muscle temperature, secondary to less efficient movement of heat from the core to the periphery.