The ALS Association reported a surge in donations and social media participation over the weekend as the revived Ice Bucket Challenge gained momentum following former NFL running back Chris Johnson's announcement that he has amyotrophic lateral sclerosis. Dozens of athletes and public figures posted videos on Sunday.

Johnson, a three-time Pro Bowl selection who set an NFL rushing record during his time with the Tennessee Titans, disclosed his diagnosis on Monday. His announcement prompted former teammates and current players to relaunch the viral fundraising campaign that first swept social media in 2014.

The original Ice Bucket Challenge raised more than $115 million for the ALS Association and helped fund research that identified genes linked to the disease. The renewed attention has driven a fresh wave of first-time donors, many of them too young to recall the initial campaign.

ALS is a progressive neurodegenerative disease that attacks nerve cells controlling voluntary muscle movement, and it has no cure. Advocacy groups including the ALS Association and I AM ALS have used the renewed publicity to press for expanded research funding and faster access to experimental therapies.

A spokesperson for the ALS Association said donations from the renewed campaign would fund research and patient care services. "Chris Johnson's courage in sharing his story has reignited a movement," the spokesperson added.