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Stroke work density of RW which is the area of the myofiber stress-strain curve, and is defined as contractile myofiber work per unit of tissue volume per beat. The closed circles represent mean (with standard error) taken over 0-day (n = 4), 14-day (n = 6), 21-day (n = 8), and 28-day (n = 7) hypoxic mice group.
