The Difference Between Overreaching And Overtraining：
1. Overreaching Is Planned.
2. Sequenced Rest Periods: The second difference between overreaching and overtraining is the way the rest periods are worked into the equation.
3. Overreaching Is Definite: The third difference between overreaching and overtraining is the way the rest periods are worked into the equation.
Bodybuilding, The Difference Between Overreaching And Overtraining
Overtraining syndrome（OTS）should not be confused with over-reaching which reflects a temporary deterioration in athletic performance or short-term fatigue. With sufficient rest, the over-reached athlete should recover and show improvement. However if the intensity and duration of training are not reduced, this could lead to OTS.
One of the main differences between over-reaching and OTS is in their recovery times. Recovery from over-reaching should take 2-3 weeks whilst OTS recovery could take several months.
The unexplained under performance syndrome
Many riders use the term ‘overtraining’ for both overreaching and overtraining and I guess that is why many riders diagnose themselves as overtrained. The problem is that if you are really in an overtraining situation, it can take several months before your performance is back at 100%. If you have overreached in a period, a week or two is normally enough to get you back on track. This principle is often used in tapering protocols, where training volume is reduced the last two or three weeks before a big event. Overtraining syndrome doesn´t happen over a night or week. It takes 6 to 8 weeks or even longer to develop.
Overreaching is not equal to overtraining
There is currently no evidence aside from anecdotal information to suggest that overreaching precedes overtraining and that symptoms of overtraining are more severe than overreaching.
Systematically controlled and monitored studies are needed to determine if overtraining is distinguishable from overreaching, what the best indicators of these states are and the underlying mechanisms that cause fatigue and performance decrements.
Does Overtraining Exist?: An Analysis of Overreaching and Overtraining Research.
Halson, Shona L 1 2; Jeukendrup, Asker E 1. Sports Medicine. 34(14):967-981, 2004.