Lou Gehrig’s disease caused by electric currents applied to or induced in the body

http://sammilham.com/Amyoptrophic%20lateral%20sclerosis%20%28Lou%20Gehrig%27s%20disease%29%20and%20electric%20currents.pdf

Since the reports of an increased incidence of ALS in Italian soccer players [2], and US professional football players [3], I had been suspicious about their exposure to TENS devices and electrical diathermy devices, because of the repeated reports [4-8] of the connection of ALS with electrical shocks and electrical environments. Three of 55 members of the 1964 San Francisco Forty-niners US
professional football club died of ALS [9] . The expected cases of ALS in 55 people followed for 30 years is 55 x 30 x 2.4 / 100,000 = 0.04, so the relative risk of ALS in this cluster was 3.0 / 0.04 or 75 times expected.