Research reports on pulmonary function measurements often mention caffeine abstinence as a condition for testing subjects. Yet, the effects of caffeine on respiration are not well documented. This study was intended to investigate the physiological effects of caffeine on respiratory resistance measurements and the necessity of caffeine avoidance in such testing. Thirty-one subjects were administered caffeine in pill form for dosages in the range of 3 - 4.5 mg/kg body weight. Respiratory resistance was measured with the Airflow Perturbation Device every 15 minutes after caffeine ingestion until a full hour of elapsed time. No changes were noted in inhalation, exhalation, and average respiratory resistances during the times of measurements. The conclusion is that for low dosages of caffeine, respiratory resistance measurements are not affected by caffeine ingestion prior to testing.
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机译：关于肺功能测量的研究报告通常会提及咖啡因禁欲作为测试受试者的条件。然而，咖啡因对呼吸的影响并没有充分记录。本研究旨在探讨咖啡因对呼吸抗性测量的生理作用以及在这种测试中携带咖啡因避免的必要性。在3-4.5mg / kg体重范围内以3.5mg / kg / kg体重的剂量给药咖啡因咖啡因。在咖啡因摄入后每15分钟用气流扰动装置测量呼吸抗性直至经过的全小时。在测量期间吸入，呼气和平均呼吸抗性没有任何变化。结论是，对于低剂量的咖啡因，在测试之前，呼吸阻力测量不受咖啡因摄入的影响。
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