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.
Running two days in a row is generally safe for most people, but it's important to listen to your body and avoid overtraining. Rest days are also important to prevent injury and allow your body to recover.
A contusion (bruise) would likely result from a sudden blow to the body.
Running two days in a row can be safe for most people, but it's important to listen to your body and avoid overtraining. Rest days are also important for muscle recovery and injury prevention.
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 :)
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A contusion (bruise) would likely result from a sudden blow to the body.
The most common cause of a wrist injury is falling onto an outstretched hand, which can result in a sprain, strain, or fracture of the wrist. Other common causes include sports-related injuries, car accidents, and repetitive strain from activities like typing or playing an instrument.