Soccer Heading Linked to Acute Spikes in Neural Damage Biomarkers S100B and p-tau217 in Amateur Players
核心洞察
Amateur soccer players who headed the ball showed significantly higher immediate increases in S100B and p-tau217 (搜索) blood biomarkers compared to non-heading players, according to a JAMA Neurology study.
A clear dose-response relationship emerged: more headers and high-impact headers (ball trajectory >20 meters) correlated with larger biomarker elevations.
Biomarker levels normalized within 24–48 hours post-match, though researchers caution the long-term consequences for brain health remain uncertain.
A prospective study published in JAMA Neurology has found that amateur soccer players who head the ball during matches experience acute, measurable spikes in blood biomarkers associated with neural damage, with the magnitude of elevation directly tied to the frequency and force of headers.
"Soccer heading was associated with acute increases in blood biomarkers for neural damage, including dose-response relationships," wrote Marloes I. Hoppen, MSc, PhD candidate in clinical neuroscience in sports at Emma Children's Hospital and Alzheimer Center Amsterdam UMC (搜索), and colleagues. "Although the consequences for long-term brain health remain uncertain, these findings suggest that amateur level heading may acutely affect neural integrity."
Study Design and Population
The prospective, population-based, case-control study evaluated 302 adult male soccer players with a mean age of 24.6 years, who participated in one of 11 organized amateur matches. Blood samples were collected at three time points: before the match, immediately after (within one hour; mean time 21.6 minutes), and at a delayed interval (24–48 hours post-match; mean time 43.4 hours).
Nearly three-quarters of the cohort (72%; n=216) had exposure to heading the ball, while the remaining 28% (n=86) did not. Video analysis revealed a mean heading frequency of two per player per match, with high-impact heading exposure—classified as a ball trajectory greater than 20 meters—observed in 48% of players. The proportion of players with a single high-impact header (26%) slightly exceeded those with multiple high-impact headers (22%).
Biomarker Findings: S100B and p-tau217 (搜索)
The study tracked six blood biomarkers: phosphorylated-tau 217 (p-tau217 (搜索)), brain-derived tau (搜索) (BD-tau), neurofilament light chain (搜索) (NfL), glial fibrillary acidic protein (搜索) (GFAP), S100B calcium-binding protein (搜索), and neuron-specific enolase (搜索) (NSE).
In a linear mixed model adjusted for age, ApoE4 status, and exercise intensity, rises in S100B concentration were significantly higher immediately after a match among players with heading exposure compared to those without (P=.03). When evaluating heading frequency, researchers identified significant links between greater header exposure and larger immediate elevations in both S100B (P=.02) and p-tau217 (搜索) (P=.01).
High-impact headers produced particularly pronounced effects. Significant associations emerged between high-impact header exposure versus no exposure and larger immediate rises in p-tau217 (搜索) (multiple headers, P=.03) and S100B (single header, P=.04; multiple headers, P=.02).
S100B is a calcium-binding protein found specifically in glial cells that provide physical and metabolic support to neurons; it is typically released into the bloodstream when these cells are under stress. p-tau217 (搜索) is a phosphorylated, abnormally tangled version of the tau protein strongly associated with Alzheimer's disease (搜索) and traumatic brain injury (搜索).
Normalization and Non-Significant Markers
When researchers assessed these biomarkers at 24 to 48 hours post-match, they found that levels had normalized. For the remaining four biomarkers—BD-tau, NfL, GFAP, and NSE—players with heading exposure showed comparable immediate and delayed changes to those without heading exposure. No significant links were found between immediate or delayed changes in these biomarkers and the number of headers or high-impact headers.
In a sensitivity analysis adjusted for blood volume, all significant results remained unchanged.
Clinical Context and Expert Commentary
"This study adds to the emerging evidence that even modest head impacts elicit a negative response from brain tissue," said Dr. Peter Theobald, Reader in Biomedical Engineering at Cardiff University, who was not involved in the study. He noted that findings from his own lab showed that even a relatively small number of headers—10 in that case—was sufficient to induce brain changes within 24 hours, with effects evident even six months after a single intervention.
Studies have shown that former professional soccer players face a two- to three-fold increased risk of neurodegenerative disease (搜索), and scientists believe repetitive head impacts contribute to this risk. Two imaging studies by Columbia researchers published in 2025 revealed that the junction between white and gray matter in the brain's outer layer, just behind the forehead, was most affected by heading, with damage associated with cognitive deficits.
Future Directions
"Future research should replicate these findings and extend research to female participants, children and professional players," Hoppen and colleagues wrote. The researchers emphasized that understanding the long-term consequences of heading at different levels of soccer could prove crucial for informing soccer policies and safety guidelines regarding heading frequency.