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Many people continue working, studying or completing everyday chores even when they feel tired and their energy is low. However, reliably completing tasks while fatigued can require considerable mental effort.

Researchers at the University of Southern California, Yeshiva University and other institutions recently carried out a study exploring whether feeling more tired than usual or performing faster than usual on a mental task predicted a reduced ability to maintain performance while tired in the following hours.

Their findings, published in Communications Psychology, suggest that feeling more tired and processing information faster than usual could be linked to a reduced capacity to push through fatigue later.

"If you imagine a person running a marathon where performance is speed, someone who already feels very tired at the beginning of the race might find it harder to ignore that fatigue to maintain their pace later in the race," Raymond Hernandez, first author of the paper, told Medical Xpress.

"If a runner runs faster than their usual pace at the beginning of a race, fatigue could be harder to ignore later in the race because more energy was used up. We wondered whether the same pattern might emerge as people tackle mental tasks throughout the day for their job or other responsibilities—a kind of cognitive marathon."

S. The participants were asked to report their levels of fatigue and complete a short task several times each day, for a total of eight to 14 days.

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