It depends on whether you are talking about aerobic training (running, cycling) or anaerobic training (weight lifting, body building) but they do have many symptoms in common:
There are several symptoms of overtraining that are physical and mental. Just because you have a few of these symptoms, it does not mean that you are overtraining. Several of these symptoms are symptoms of many illnesses and viruses.
Physical symptoms:
Mental symptoms:
you start to sweat!:D
training for along time
All of the above
A decline in athletic ability can be the result of overtraining.
Sympathetic nervous system overtraining and Parasympathetic nervous system overtraining.
HR is the single most effective indicator of overtraining. If you perform the same activity as you did a few weeks ago and your HR is significantly higher you are probably overtraining. Also, if you feel weaker and less willing to do your exercises you might be. You really have to be a serious athlete to reach this level however. Its not common. Ref: B.S. in Exercise Science from Ball State University :)
Overtraining
risky because you can sick or hurt
Dicks and balls
Always exercise within your comfort level.
wsw
A decline in athletic ability can be the result of overtraining.
There is no new name, if you over train, you over train, that's that!
Overtraining is quite often like purging after eating. You are tried to burn off the calories that you have consumed and quite often you are mentally obsessed by how much you are training, working out, etc. It is also known as exercise bulimia.
It depends on your sex, height, weight, race, and many other factors. For the average adult male, that would be overtraining, but if you can handle it...