Sommer, A. J., Ianni, A. L., Conkle, J. A., Schill, K. E., Trexler, E. T., Focht, B. C., & Devor, S. T. (2013). Hydration efficacy of a hyperoxygenated nutritionally enhanced beverage in experienced runners. Medicine & Science in Sports & Exercise, 45(5), Supplement abstract number 310.

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This study determined if a commercially available hyperoxygenated beverage (O2water), would limit dehydration when consumed during a sub-maximal running bout in hot and humid conditions. Experienced male runners completed two 45-minute runs at 70% of their pre-determined VO2max in a temperature and humidity controlled environmental chamber. Conditions were set at 30C and 50% relative humidity. Ss were randomly provided either O2water or water during the first run (consumed ad libitum). For the second run, Ss were prescribed the same volume consumed in the first run of the alternate beverage. Hydration status was determined via plasma osmolality pre-run and at 30, 60, and 90 minutes post-run.

Post-urination body weight indicated greater fluid retention (180g) after consuming O2water versus water. When Ss consumed water, post-run plasma osmolality increased 0.67%, 0.67%, and 0.82% at 30, 60, and 90 minutes, respectively. Conversely, when Ss consumed O2water, plasma osmolality decreased 0.7% and 0.15% at 30 and 60 minutes, and increased 0.12% at 90-minutes post-run.

Implication. Compared to water, O2water may limit dehydration for experienced male runners in hot humid conditions.

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