Sixty-minute inhalation of molecular hydrogen decreases blood oxygen saturation but does not alter autonomic cardiac regulation at rest in healthy females: A randomized, double-blind, placebo-controlled crossover study

This randomized, double-blind, placebo-controlled crossover study
investigated the effects of 60-minute molecular hydrogen inhalation on
oxygen saturation and heart rate variability in healthy females. Twenty
physically active participants completed two inhalation sessions with
either molecular hydrogen or placebo (ambient air), separated by a
seven-day washout period. Oxygen saturation and heart rate variability
were monitored during 60 minutes of inhalation. The dataset contains basic
anthropological characteristics of participants. The oxygen saturation
value represents the average value taken from a 5-minute segment. The
heart rate variability values represent the time- and frequency-domain
indices calculated from a 5-minute segment.