Related Experiment Video
Updated: Jul 28, 2026
09:25
The Treadmill Fatigue Test: A Simple, High-throughput Assay of Fatigue-like Behavior for the Mouse
Published on: May 31, 2016
Mental fatigue, work and sleep.
T Akerstedt1, A Knutsson, P Westerholm
1National Institute for Psychosocial Factors and Health, Department of Public Health Sciences, Karolinska Institute, Stockholm, Sweden. torbjorn.akerstedt@ipm.ki.se
Journal of Psychosomatic Research
|December 8, 2004
Summary
Disturbed sleep significantly predicts mental fatigue, even more than work load or other factors. High work demands and immersion also contribute to fatigue in this study of 5720 individuals.
Area of Science:
- Occupational Health
- Psychology
- Epidemiology
Background:
- Mental fatigue is a growing concern in the modern workforce.
- Understanding its predictors is crucial for employee well-being and productivity.
Purpose of the Study:
- To investigate the multivariate relationship between mental fatigue and various work-related, lifestyle, and sleep factors.
- To identify key predictors of mental fatigue in a large cohort of employed individuals.
Main Methods:
- A questionnaire study involving 5720 healthy employed adults in the greater Stockholm area.
- Multiple logistic regression analysis was used to determine the predictors of self-rated fatigue.
Main Results:
- Disturbed sleep emerged as a primary predictor of fatigue (OR 4.31).
- High work immersion (OR 4.17) and high work demands (OR 2.39) also significantly predicted fatigue.
- Factors like female gender, supervisor status, and older age were associated with fatigue, while shift work and overtime were not significant predictors.
Conclusions:
- Disturbed sleep is a more potent predictor of mental fatigue than previously recognized factors like workload or gender.
- Interventions targeting sleep quality may be highly effective in mitigating mental fatigue.
Related Concept Videos
01:24Muscle Recovery and Fatigue
Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...
01:24Sleep-Wake Cycles
Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
01:21Fatigue
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
01:13Insufficient Sleep and Sleep Deprivation
Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
Sleep deprivation is a more severe form of sleep loss...
Sleep deprivation is a more severe form of sleep loss...
01:27Insomnia
Insomnia is a prevalent sleep disorder characterized by difficulty falling asleep, frequent awakenings during the night, and waking up too early without being able to return to sleep. People with insomnia often experience these disruptions at least three nights a week for at least one month. Chronic insomnia, which lasts for at least three months, can lead to increased anxiety, which in turn can worsen sleep difficulties, creating a cycle of sleeplessness and stress.
Multiple factors contribute...
Multiple factors contribute...
01:07Narcolepsy
Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.