By Max Trumper. A thesis presented to the faculty of the graduate school in partial fulfillment of the requirements for the degree of Doctor of Philosophy. Paper. Price, $1. Pp. 72, with illustrations. Philadelphia, 1928.
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This details a research into the conditions of breathing and of blood in 103 stammerers, of whom 80 were adults. About half of the adults had low vital capacity (the greatest amount of air that can be expired after a maximum inspiration). One third were shallow breathers. "The cases exhibited a correlation between the type of breathing and the red cell count and hemoglobin content." Shallow breathing was compensated by a high red count and high hemoglobin. In some cases, deep breathing compensated for low vital capacity. "When the compensation was adequate, the red cell count and hemoglobin were normal, where incomplete the erythrocytes and hemoglobin were increased." In other cases in which depth of breathing was normal, the blood observations also were normal. Such studies should eventually disclose either a physical correspondence or a difference between the stammerer and the nonstammerer. In this paper a similar study of nonstammerers
A Hemato-Respiratory Study of 101 Consecutive Cases of Stammering.. JAMA. 1930;95(15):1121. doi:10.1001/jama.1930.02720150061031