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** [http://en.wikipedia.org/wiki/Lyme_disease Lyme disease].
* '''Work related stress'''<ref name="OTDepression"/>. Work can create direct stress and long hours can also impair sleep.
* '''[[Glycogen]] depletion'''<ref name="OTEcssPos"/><ref name="OTDepression"/>. It is much harder to train when our [[Muscle|muscles ]] a depleted of [[Glycogen]], and some authorities suspect the chronic [[Glycogen]] depletion adds to the overall stresses and could be a trigger for [[Overtraining Syndrome]].
* <span style='color:\#008F00'>Poor diet</span><ref name="OTEcssPos"/><ref name="OTDepression"/>. Reduced calorie intake also reduces our ability to recover and deal with stress, both training stress and non-training stress. A poor quality diet that is lacking in essential nutrients can also have a negative impact on recovery. To particular deficiencies to note are [[Magnesium]]<ref name="OTEcssPos"/> and Iron<ref name="OTEcssPos"/>. A symptom of [[Overtraining Syndrome]] is reduced appetite, making the quality of the diet worse.
* '''Environmental stress'''<ref name="OTEcssPos"/>. Training in the extremes of heat or cold and to the training stresses. Because the stresses affect all workouts they have a tendency to increase [[Training Monotony]]. [[Altitude Training]] also acts as an environmental stress and [[Intermittent Hypoxic Exposure]] has been shown to produce a short-term performance degradation. However living at a higher altitude than normal is an even greater stress as it impacts all the time and will impair sleep quality.
