American Journal of Physiology-Heart and Circulatory Physiology, 320(4), H1687-H1698. American Physiological Society AJP-Heart and Circulatory Physiology, 320(4), H1687-H1698. AMER PHYSIOLOGICAL SOC American journal of physiology. Heart and circulatory physiology, 320(4), H1687-H1698. American Physiological Society