Citation: Amerongen, Suzan van, et al. “Catecholamine Dysregulation in Former American Football Players.” Neurology, vol. 104, no. 10, 21 Apr. 2025, https://doi.org/10.1212/wnl.0000000000213584.
This study examined cerebrospinal fluid (CSF),the fluid that surrounds the brain and spinal cord, in former professional and collegiate football players as well as men who had never played football. The goals were 1) to compare the levels between players and non-players and 2) to see if levels of stress hormones (catecholamines) in the CSF were related to repetitive head impacts (RHI’s), chronic traumatic encephalopathy (CTE), and other neurological symptoms. This is an observational cross-sectional study. The study compared levels of stress hormones in former male American football players with males who did not play football. The methodology to measure the catecholamine levels was high performance liquid chromatography. Statistical methods included analysis of covariance and multivariable linear regression. 85 former professional football players, 35 former college football players, and 35 non-football player males were included in this study; the age range was 45 to 75 years old. The former players had significantly lower levels of the stress hormone norepinephrine compared to those who did not play football. Other stress hormones, including dopamine, were also lower in the CSF of the former football players.
Author's Note
I was interested in this study because I was familiar with CTE occurring in football players, but I was curious to know more about what occurs in the nervous system when CTE is present. It was interesting to learn that other chronic issues, such as cognitive impairment, parkinsonism, and depression/anxiety, can also be prevalent in former football players. I was disappointed to learn that the researchers weren't able to find a clear relation between levels of catecholamines and symptoms of behavioral dysregulation, parkinsonism, and cognitive impairment. This illustrates how complex this chronic issue is in former football players and it may be impacted by many factors.
Rating: I found this paper moderately easy to follow and well organized, although there were many words I had to look up in order to fully understand the complex issues that were being discussed.