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Physical Activity, Fatigue, and Vigor

  • By: Patrick J. O'Connor & Matthew P. Herring
  • In: Encyclopedia of Lifestyle Medicine & Health
  • Edited by: James M. Rippe
  • Subject:Health Psychology / Behavioral Medicine, Public Health Education & Health Promotion, Health Psychology

Moods are adaptive, subjective feelings created by brain neural networks. Vigor is a positive mood described by feelings of energy and enthusiasm. Fatigue is a mood state that is moderately and negatively related to vigor, yet can be conceptualized as separate from vigor. A fatigued mood state is characterized by feelings of exhaustion and weariness. Although only about 1% of the population suffers from the severe psychiatric disorder known as chronic fatigue syndrome, persistent and debilitating feelings of low energy and fatigue occur in as many as 25% of people in community samples. The prevalence of persistent fatigue is approximately 50% among groups of people suffering from major medical conditions, including cancer and heart disease. Because physical inactivity contributes to feelings of low energy and ...

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