Figure 5From: The physiological effects of hypobaric hypoxia versus normobaric hypoxia: a systematic review of crossover trials Graph of heart rates. Graph to show the difference in heart rate between the two environments over time. Each data point represents data obtained from a study and the number refers to the time point. If the data point is in the green area, the heart rate was found to be higher in HH but if in the blue area, the heart rate was found to be lower in HH.Back to article page