Update: Through further analysis, it appears that Hart had suffered a seizure. According to Si.com, Hart did reach out to his team at half-time to give an update on his status and reported that he was doing well.
BLOOMINGTON, I.N. (WSYR-TV) – Mike Hart, the running backs coach at Michigan was carted off the field after collapsing during Saturday’s game at Indiana.
Hart fell to the ground during the first quarter of the game. Officiates stopped the game, prompting medics to come to the Michigan sideline and load him onto the medic cart.
According to Si.com, as Hart was carted off the field he gave a thumbs-up to the fans, signifying that he was still responsive and alert.
Hart is a Syracuse native and graduated from Onondaga Central High School.
During his time at Onondaga Central High School, Hart set the national record for career rushing touchdowns (204) and finished second in career rushing yards (11,045). The Tigers were 46-1 and won three state championships with Hart in the backfield.