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To the Editor: Bottled waters described as "oxygenated" are sold with claims that they confer health benefits. The waters are advertised to contain 7 to 40 times more oxygen (O₂) than ordinary water and to enhance exercise, with statements such as "enhanced sports performance"¹ and "improves cardiovascular and muscle endurance"² commonly used. We measured O₂ in oxygenated water and assessed its effect on maximal performance during exercise.

Methods

We first measured the PO₂ in 5 brands of bottled water advertised as "oxygenated" and compared the values with those of well-stirred tap water. Samples were obtained by inserting a needle into the bottles through the sidewall or cap and drawing water into a gas-tight syringe. PO₂ was measured in triplicate using a blood gas analyzer calibrated into the hyperbaric range (Model 1604, Instrumentation Laboratory, Lexington, Mass). Water O₂ content was calculated from PO₂ with a standard formula.³

Participants were 11 healthy . . . [Full Text of this Article]

Neil B. Hampson, MD
Section of Pulmonary and Critical Care Medicine
Virginia Mason Medical Center
Seattle, Wash

Neal W. Pollock, PhD
Department of Anesthesiology
Duke University Medical Center
Durham, NC

Claude A. Piantadosi, MD
Division of Pulmonary and Critical Care Medicine
Duke University Medical Center

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