Reduced exercise tolerance in a patient in whom any heart diseases were preliminarily excluded suggests other frequent causes of effort-related symptoms, that is, exercise-induced bronchoconstriction, lack of training, or overweight. The presented case underscores the importance of comprehensive diagnostic workup in children with exercise-related symptoms.

中文翻译：

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运动耐量降低并不总是意味着支气管哮喘

初步排除任何心脏病的患者的运动耐量降低提示其他常见的与努力相关症状的原因，即运动引起的支气管收缩、缺乏训练或超重。本案例强调了对有运动相关症状的儿童进行全面诊断检查的重要性。