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Take Fatigue Seriously - Says Researcher

Instead of dismissing grumblings about being tired or exhausted, people should take these complaints seriously// before they lead to a worsened health state or even death, says a University of Alberta researcher investigating fatigue.

Dr. Karin Olson, a U of A professor from the Faculty of Nursing, argues that there are differences between tiredness, fatigue and exhaustion and that recognizing those distinctions will help health-care workers create better treatment plans for their patients. Her findings are published in the current issue of Oncology Nursing Forum.

Olson has studied fatigue in six ill and non-ill populations: shift workers, recreational long distance runners, individuals with cancer in active treatment or palliative settings, and individuals diagnosed with depression or chronic fatigue syndrome. Having worked with cancer patients for many years, she saw how serious fatigue was and the impact it had on the patients’ quality of life. Some patients even withdrew for a potentially curative treatment saying they were “too tired.”

“The kind of fatigue experienced by individuals with cancer is different from the feeling that you or I have at the end of a busy week,” said Olson. “Interestingly, when you start looking at other populations, such as people with chronic illnesses or shift workers and take a broad view, the descriptions of fatigue are the same. Thus, while the reasons for fatigue may vary, the kinds of adaptations required may not.”

Olson, who is currently an Alberta Heritage Foundation for Medical Research (AHFMR) Health Scholar, has created new definitions for tiredness, fatigue and exhaustion and argues that they represent various points on an energy continuum. The amount of energy a person has influences how easily he can adapt to stress that comes his way. Individuals who are tired still have a fair bit of energy, so although they may feel forgetful, and impatient, and experience gradual heaviness or w eakness in muscles following work, this is often alleviated by rest.

Fatigue, on the other hand, is characterized by difficulty concentrating, anxiety, a gradual decrease in stamina, difficulty sleeping, increased sensitivity to light and the limiting of social activities once viewed as important. Individuals with exhaustion report frank confusion that resembles delirium, emotional numbness, sudden loss of energy, difficulty both in staying awake and in sleeping and complete social withdrawal.

“It is important to recognize the difference between tiredness and fatigue, because fatigue is a marker that the body is not able to keep up,” says Olson. “The onset of the manifestations of fatigue, particularly if these are not normal states for you, should be taken seriously.”

Failing to understand the distinctions between tiredness, fatigue and exhaustion could result in the use of inappropriate interventions that inadvertently promote fatigue and exhaustion. Olson has some evidence that while exercise appears to help those who are tired, it may decrease the ability to adapt in individuals experiencing fatigue and exhaustion. People experiencing fatigue should also avoid long-term use of caffeine and other stimulants and exhaustion, as these substances “fool” the body into thinking it has more energy available than it really does.

“The important thing is to try to prevent or at least delay the progression from tiredness to fatigue and then from fatigue to exhaustion,” said Olson. “We are starting to work on some interventions that we think may be helpful. In the meantime, families and friends can help by recognizing changes consistent with fatigue and exhaustion and look for ways to help minimize stress.”

This work may also have applications to other population, such as students or individuals with chronic illnesses, who have not been studied to date. “Students tend to stay up late at night, studying hard,” said Olson. “So me studies show that changes in sleep patterns are may compromise one’s ability to remember things and to integrate new information.

“We’re a long way from having all the answers but this study was a start. It has provided us with a great foundation for future research among individuals with cancer and other groups ranging from ‘burned out’ workers to recreational athletes and people with chronic diseases.”


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