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Sympathetic nervous system overtraining and Parasympathetic nervous system overtraining.
Most of the time it is; however, it can also be the result of injury.
The most common are head injury, leg injury, bike arm's injury, muscle damage and road rash injury.
Like most muscles, the triceps can cramp after a period of exercise, and is usually caused by poor posture, insufficient stretching, or overtraining. Muscles may also cramp as a result of dehydration, or as a result of certain acute medical conditions.
The most common is fatigue, followed by muscle weakness or pain.
A contusion (bruise) would likely result from a sudden blow to the body.
Often whiplash pain worsens several days after the injury. For most, symptoms will slowly abate within about 3 months, with a smaller proportion of people the symptoms become chronic and disability may result.
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 :)
Cobalamin deficiencies most often result in the disease pernicious anemia.
Abnormal cell division
A decision based on what constitutes an acceptable level of risk
In most places, plagiarism is not a criminal act. It can result in criminal charges for fraud if used to deceive. It could result in personal injury charges as well. It can also result in a lawsuit for violation of copyright.