Study on Breath-Holding Test:(II) Modification of the Peripheral Blood Flow

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1. Gas analysis of the cubital vein blood, plethysmography of the finger and the fore-arm, and blood pressure measurement on the brachial artery were performed during the breath-holding test. Cutaneous blood capillaries in the nail-bed were also observed. 2. Breath-holding resulted in the increase in O2 content and decrease in CO2 content of the cubital vein blood. This decrease in venosity in the upper limb is explained by assuming a substantial utilization of the arterio-venous anastomosis by the circulating blood in the upper limb. 3. The breath-holding is accompanied by the contraction of blood vessels in the skin and the muscle. This vasomotor effect, obviously of central nature, serves to shunt off the locomotor organ and to avoid a drastic decrease in the oxygen supply to vegetative organs. 4. The breath-holding causes elevation of both the systolic and the diastolic blood pressure, reaching their highest values directly after the interruption of the breath-holding. In a group of, subject, a transitory increase of the finger volume was observed, which was interpreted as produced by marked elevation of the arterial blood pressure.
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