Some doubted that the matter was so simple. One well-known study analyzed five cases of people who had died while running and found significant hardening of the arteries and high levels of fat and cholesterol in the bloodstream. In other words, they had died of heart disease.
這項研究，是以五名在慢跑中死亡的人為對象，結果發現他們死時，冠狀動脈都已硬化，血管內也有膽固醇、類脂肪、噬脂細胞等不利心臟的物質；換句話說，心臟病是他們的主要死因。