Williams I P, Smith C M, McGavin C R
Br J Dis Chest. 1982 Apr;76(2):164-6.
Eight patients with chronic obstructive bronchitis and moderate disability entered a pilot study of the effects of controlled diaphragmatic breathing. They received three weeks of placebo physiotherapy (shoulder exercises) followed by three weeks of instruction on controlled diaphragmatic breathing. No beneficial effects were observed on exercise performance or the perceived strain of exercise.
八名患有慢性阻塞性支气管炎且有中度功能障碍的患者参与了一项关于控制性膈肌呼吸效果的初步研究。他们先接受了为期三周的安慰剂物理治疗（肩部运动），之后接受了为期三周的控制性膈肌呼吸指导。但未观察到对运动表现或运动时自觉疲劳程度有任何有益影响。
