Kinda depends. A lot of mma guys are sparring boxing/muay thai/kickboxing basically constantly. Dudes sparring 10 hours a week are going to take a lot of damage over a couple decades. Obviously football and boxing also have issues in training and are rougher during actual time, but it can be really bad for MMA guys too. Chute box dudes are known for sparring at almost 100% all of the time and regularly having gym wars. Also if a fighter finds success in weathering the storm then those guys are gonna be real bad off (Spencer Fisher, Tony Ferguson)
Kinda depends. A lot of mma guys are sparring boxing/muay thai/kickboxing basically constantly. Dudes sparring 10 hours a week are going to take a lot of damage over a couple decades. Obviously football and boxing also have issues in training and are rougher during actual time, but it can be really bad for MMA guys too. Chute box dudes are known for sparring at almost 100% all of the time and regularly having gym wars. Also if a fighter finds success in weathering the storm then those guys are gonna be real bad off (Spencer Fisher, Tony Ferguson)