He gave them gifts, invited them to his house, and brought them ice packs and wiped away the blood when they were injured. He called them nicknames, like “goofball.” The young women, many of them aspiring gymnasts, considered Dr. Lawrence G. Nassar their advocate, a sports medicine “guru” who would help cure them of their pain.

But on Monday in a Michigan courtroom, on the fifth day of Dr. Nassar’s sentencing hearings, dozens of women spoke out or had their statements read aloud for them — statements about how, after winning their trust, he sexually molested them. They described being misled as children and teenagers, saying that they saw Dr. Nassar as a trustworthy savior who consoled them or wiped blood from their faces, and as a man they looked up to as a prominent doctor in gymnastics.

As nearly 100 women did last week, they offered remarks that went beyond the emotional and graphic stories of sexual abuse by Dr. Nassar when they were sent to him as young athletes. On Monday, more than a dozen asked how the abuse could have gone on for decades, and why organizations — such as the national gymnastics governing body and Michigan State University, his employer — enabled him or turned a blind eye.

On Monday, several top board members of U.S.A. Gymnastics announced their resignations, including the group’s chairman, vice chairman and treasurer. On Saturday, a Michigan State trustee, Mitch Lyons, dissented from the board’s public support for its president, Lou Anna K. Simon, calling for her to resign amid questions around her knowledge about Dr. Nassar’s behavior.