Severely increased risk of amyotrophic lateral sclerosis among Italian professional football players

Brain. 2005 Mar;128(Pt 3):472-6. doi: 10.1093/brain/awh373. Epub 2005 Jan 5.


The cause of amyotrophic lateral sclerosis (ALS) is still unknown. A possible relationship between ALS and sport participation has been supposed, but never definitely demonstrated. We studied a cohort of 7325 male professional football players engaged by a football team from the Italian First or Second Division in the period 1970-2001. ALS cases were identified using different concurrent sources. Standardized morbidity ratios (SMRs) were calculated. During the 137,078 person-years of follow-up, five ALS cases were identified (mean age of onset, 43.4 years). Three cases had a bulbar onset, significantly more than expected (P = 0.003). Since the number of expected cases was 0.77, the overall SMR was 6.5 [95% confidence interval (CI), 2.1-15.1]. The SMR was significantly increased for an ALS onset before 49 years, but not for older subjects. A significant increase of the SMR was found in the periods 1980-1989 and 1990-2001, whereas no ALS case was found in the 1970-1979 period. A dose-response relationship between the duration of professional football activity and the risk of ALS was found (>5 years, 15.2, 95% CI, 3.1-44.4; < or =5 years, 3.5, 95% CI, 0.4-12.7). Our findings seem to indicate that playing professional football is a strong risk factor for ALS.

MeSH terms

  • Adolescent
  • Adult
  • Age of Onset
  • Aged
  • Amyotrophic Lateral Sclerosis / epidemiology
  • Amyotrophic Lateral Sclerosis / etiology*
  • Humans
  • Incidence
  • Italy / epidemiology
  • Male
  • Middle Aged
  • Occupational Diseases / epidemiology
  • Occupational Diseases / etiology*
  • Retrospective Studies
  • Risk Factors
  • Soccer*
  • Time Factors