Can over doing it cause long term damage
Yes. If you over train mildy and back off enough, you’ll recover ok after a bit. Continue with over training and it’ll take a lot longer to come back from.
“The negative consequences of overtraining are often gradual. The body is quite good at masking the earliest symptoms. But overtraining is a canny adversary. The problems it engenders will triumph in the end, unless changes are made to training, diet, and stress level.
Stage 1 or functional overtraining: The onset and earliest stage, very subtle indicators can clue you in that you’re heading for more serious problems.
Stage 2 or sympathetic overtraining. Brain and nervous system and hormonal imbalances cause a variety of signs and symptoms.
Stage 3 or parasympathetic overtraining. A serious condition, it results in exhaustion, severely affecting the nervous system, muscles, and hormonal levels.
The overtraining syndrome typically results in poor athletic performance, structural injury, such as in the foot, knee, or lower back, secondary to muscle imbalance, and metabolic problems, such as fatigue, infection, bone loss, sexual dysfunction, altered mood states, and brain and nervous system dysfunction. The signs and symptoms go beyond training and competition problems; they can even affect a person’s quality of life, sometimes for many years. More importantly, in the earliest stage many of the problems of overtraining are somewhat vague and indistinct unless a careful evaluation is made”.