Study Finds CTE in Quarter of Deceased Former NFL Players

亡くなった元NFL選手のうち4分の1にCTEが確認されたとの研究結果

更新日: 2026年8月26日 02:15

A recent study published in The BMJ has shed new light on the health risks facing former NFL players.

『ザ・BMJ』に発表された最近の研究により、元NFL選手が直面する健康リスクに新たな光が当てられた。

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By examining the brains of athletes who passed away between 2016 and 2021, researchers discovered that at least 24.5%—roughly one in four—suffered from Chronic Traumatic Encephalopathy (CTE).

2016年から2021年の間に亡くなった選手の脳を調査した結果、研究者たちは少なくとも24.5%(およそ4人に1人)が慢性外傷性脳症(CTE)を患っていたことを発見した。

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Daniel Daneshvar describes this figure as a conservative estimate, noting that the true prevalence could potentially be much higher.

CTEは死後でなければ確定的な診断ができないため、この研究は小規模な脳バンク研究と、亡くなった選手の広い集団との間の溝を埋める助けとなる。

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Because CTE can only be definitively diagnosed after death, this study helps bridge the gap between small-sample brain bank research and the broader population of deceased players.

研究結果は、CTEと認知機能低下の間に明白な相関があることも明らかにした。

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The findings also reveal a stark correlation between CTE and cognitive decline; among those with the condition, 61.3% showed symptoms of dementia, with that number rising to over 90% in the most severe cases.

CTEを患う人のうち61.3%に認知症の症状が見られ、重症ケースではその割合が90%を超える。

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While this study cannot track the health of living players, it has triggered urgent calls for increased player safety and further research into potential treatments for this life-altering condition.

一般市民におけるCTEの有病率は1%未満だからである。

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理解度チェック

What is the minimum percentage of deceased former NFL players found to have CTE in this study?

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正解

24.5%

Why is it difficult to determine the exact number of CTE cases among all former NFL players?

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正解

CTE can only be definitively diagnosed after a person has died.

What is the relationship between CTE and dementia according to the study?

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正解

There is a strong correlation, with 61.3% of CTE patients meeting clinical criteria for dementia.

How do researchers characterize the 24.5% statistic?

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正解

It is a conservative or low-end estimate.

What is the comparison made regarding the prevalence of CTE in the general population?

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正解

It is less than 1%.

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