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Working While Tired may Hurt Heart
The study, conducted by psychologists at the University of Alabama at Birmingham (UAB), supports a theory which suggests that fatigued individuals' cardiovascular systems are forced to work harder when they attempt to complete tasks, such as those encountered on the job or at school.
The study showed that fatigued individuals had larger blood pressure increases than rested individuals under conditions where they viewed success as both possible and worthwhile.
UAB psychologist Rex Wright, Ph.D., who led the study, believes the effects were determined by effort on the part of the study participants.
He said that when fatigued individuals perceive a task as achievable and worth doing, they increase their effort to make up for their diminished capability due to fatigue.
As a result, blood pressure tends to rise and remain elevated until the task is completed or individuals stop trying because they think success is impossible or too difficult to be justified.
"Our findings are relevant to health because of links that have been established between cardiovascular responsiveness and negative health outcomes, including hypertension and heart disease," Wright said.
"Individuals who experience chronically exaggerated cardiovascular responses are believed to be at greater health risk than individuals who do not. Thus, the implication is that chronic fatigue may pose a health risk under some performance conditions," he added.
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