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“Background selleck screening library Running economy (RE), which is defined as the sub-maximal oxygen consumption at a given running velocity, is an important physiological parameter as superior RE is essential for successful endurance running performance [1, 2]. In general, runners with good RE use less oxygen than runners with poor RE at the same absolute exercise intensity. RE appears to be influenced by many physiological factors [1] including hydration status. Coyle (2003) proposed that a -4 to -8% body mass (BM) deficit due to dehydration (i.e.