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It's info from Harvard Medical College
was very helpful
Overtraining: When pushing hard is harmful
With so much emphasis placed on increasing physical activity, we hear very little about overtraining. For competitive athletes and some recreational athletes, however, overtraining can be a serious problem.
The definition of overtraining is personal. It is the point at which an athlete is training so hard and for so many hours that recovery does not occur with usual periods of rest. Athletic performance demands a balance of extreme effort and recovery. The athlete must expend a tremendous amount of energy on some days and also determine an adequate, but not excessive, number of days off, to be spent either resting completely or exercising with less intensity.
Many recreational and competitive athletes tend to think that more exercise and effort is always better. Even if they are aware of the facts, the tendency is to want to exert themselves a little longer and a little harder during the next workout.
Symptoms of overtraining
Fatigue is one of the earliest symptoms of overtraining. Some experts call the earliest symptoms, those that resolve quickly if you just decrease the workout intensity on every third or fourth day, overreaching rather than overtraining.
If you continue overreaching without recovery, you may experience some of these symptoms of overtraining:
loss of sexual desire
more aches and pains
declining athletic performance
In the more severe form of the overtraining syndrome, the following can occur:
menstrual irregularities in women
more significant sleep problems
prolonged muscle soreness
markedly diminished athletic performance
Muscle strength may be diminished for the individual; however, this cannot be detected on exam because most athletes have attained much greater strength than what is considered normal. Even a significant loss in strength would be rated as normal strength by a physician. In addition, although some blood tests can become abnormal in severe overtraining syndrome, no one test is reliable enough to be used as a diagnostic marker.
Who is at risk?
Risk factors for overtraining syndrome fall into two major categories: those that relate to the mind and body of the individual (called intrinsic factors) and those factors that are external (called extrinsic).
Intrinsic risk factors include:
less than optimal general health
intervening medical illness or surgery
compulsive or Type A personality
diminished stress tolerance and coping strategies
absence of normal menstrual cycles
Examples of extrinsic factors are:
intensity, duration, and number per week of the hard workout sessions
deviation from prior successful training history
environmental conditions such as time of year, climate, and altitude
quality and quantity of food intake
restful and restorative sleep on a consistent basis
overuse of alcohol, tobacco, caffeine, herbs, and stimulants
In general, men are at higher risk of overtraining than women.
Preventing and treating overtraining
The best way to prevent overtraining syndrome is to pay attention and respond appropriately to the earliest symptoms. When exercise produces feelings of fatigue, rather than a sense of increased energy, don't try to overcome this by exercising harder. Instead, you should intersperse days of light exercise or complete rest as part of your weekly routine.
This is especially true if you are ramping up the duration and intensity of workouts simultaneously. Continually increasing the amount and intensity of exercise at the same time results in the greatest chance of overtraining and "burnout."
Eating a balanced diet and getting adequate sleep are two other key elements that will help prevent overtraining syndrome. Nutritional supplements such as extra vitamins and amino acids do not aid performance. Some female athletes need to take an iron tablet to maintain a normal red blood cell count.
Alteration in mood can be either a contributing cause or an effect of overtraining. Symptoms of depression and anxiety need to be addressed and treated, including use of medications when necessary.
Once symptoms progress to a full-blown overtraining syndrome, then a more extended period of rest is required. Athletes should restart training while adhering to defined periods of rest and recovery.
In general, intense endurance training sessions should be limited to no more than three days in a row, and for resistance training the intervals of muscle rest are usually every other day.