Working hard when tired raises blood pressure

Mental or physical exertion when tired may raise blood pressure and harm your health. Studies in the past have linked cardiovascular responsiveness to poor health, including high blood pressure (hypertension) and heart disease. To weigh the impact of working hard while being tired on blood pressure and overall health of humans, British researchers asked 80 people to memorise two or six nonsense trigrams (meaningless, three-letter sequences) within two minutes for winning a modest prize. Cardiovascular measures of the participants were taken during the work period. Compared to those with low levels of fatigue, those with moderate fatigue were found to have higher blood pressure while doing the two-trigram memorisation task. Furthermore, participants with high levels of fatigue had low blood pressure increases in both the two- and six-trigram tasks. The researchers noted that moderately fatigued participants viewed success as relatively hard, but still possible and worthwhile. On the other hand, those with high levels of fatigue viewed both tasks as too difficult to attempt, which increased their blood pressure. This was due to the fact that when fatigued people regard a task as worthwhile and achievable, they increase their effort to compensate for their diminished capability. As a result, a tired person's blood pressure increases and remains elevated until the task is completed or the person gives up. The findings suggest that chronic fatigue may pose a health risk under some performance conditions.

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