Effects of an afternoon nap on nighttime alertness and performance in long-haul drivers
ABSTRACT The effects of an afternoon nap on alertness and psychomotor performance were assessed during a simulated night shift. After a night of partial sleep restriction, eight professional long-haul drivers either slept (nap condition) or engaged in sedentary activities (no-nap condition) from 14:00 to 17:00 h. Alertness and performance testing sessions were conducted at 12:00 (pre-nap baseline), 24:00, 02:30, 05:00 and 07:30 h, and followed 2-h runs in a driving simulator. In the nap condition, the subjects showed lower subjective sleepiness and fatigue, as measured by visual analog scales, and faster reaction times and less variability on psychomotor performance tasks. Electrophysiological indices of arousal during the driving runs also reflected the beneficial effects of the afternoon nap, with lower spectral activity in the theta (4-7.75 Hz), alpha (8-11.75 Hz) and fast theta-slow alpha (6-9.75 Hz) frequency bands of the electroencephalogram, indicating higher arousal levels. Thus, a 3-h napping opportunity ending at 17:00 h improved significantly several indices of alertness and performance measured 7-14 h later.
- SourceAvailable from: Mohd Amzari Tumiran
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- "Nap could function in managing sleep deprivation and arrhythmia (abnormal heartbeat) due to interfered circadian cycle (Verrier and Josephson 2009). The midday nap could function in recovering negative physical and psychological symptoms due to interfered night sleep (Bonnefond et al. 2001; Macchi et al. 2002) or narcolepsy (Takahashi 2003). "
ABSTRACT: Napping/siesta during the day is a phenomenon, which is widely practised in the world. However, the timing, frequency, and duration may vary. The basis of napping is also diverse, but it is mainly done for improvement in alertness and general well-being. Neuroscience reveals that midday napping improves memory, enhances alertness, boosts wakefulness and performance, and recovers certain qualities of lost night sleep. Interestingly, Islam, the religion of the Muslims, advocates midday napping primarily because it was a practice preferred by Prophet Muhammad (pbuh). The objectives of this review were to investigate and compare identical key points on focused topic from both neuroscientific and Islamic perspectives and make recommendations for future researches.Journal of Religion and Health 08/2015; DOI:10.1007/s10943-015-0093-7 · 1.02 Impact Factor
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- "Several researchers indicated a relationship between cognitive task length and response time. Firstly, Levitt and Gutin (1971) found a non-monotonic effect on reaction time while Macchi et al. (2002) found a positive relationship between response time and cognitive task length; Furthermore, Boksem et al. (2005) found a mixed relationship based on post error responses which was negative and post correct responses which was positive after either a medium or longhaul physical task performance. "
ABSTRACT: Some theoretical control models posit that the fatigue which is developed during physical activity is not always peripheral and it is the brain which causes this feeling of fatigue. This fatigue develops due to a decrease of metabolic resources to and from the brain that modulates physical performance. Therefore, this research was conducted to find out if there was finite level of metabolic energy resources in the brain, by performing both mental and physical activities to exhaustion. It was found that there was an overflow of information during the exercise-involved experiment. The circular relationship between fatigue, cognitive performance and arousal state insinuates that one should apply more effort to maintain performance levels which would require more energy resources that eventually accelerates the development of fatigue. Thus, there appeared to be a limited amount of energy resources in the brain as shown by the cognitive performance of the participants.
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- "Howmuchsleepandfor howmanydayswouldbeneededforfullrecuperationdependsnotonlyonthe degreeofpriorsleeploss,butalsoonthetimingofpriorsleepandwake periods,withrecuperationfollowingnightshiftworkcomparedtodayshift workrequiringmorerecoverysleep.Howmuchrecoverysleepisneededinspecific casescannotbereadilycapturedinaruleofthumb,althoughitcanbeestimated usingamathematicalfatiguemodel(seebelow). Whileinmany24/7operationstimetosleepatnightislimited,itmaybepossibleto makeupforthisbysplittingsleepintoarestrictednighttimesleepperiod(knownas "anchorsleep")andasupplementarydaytimenap.Thefeasibilityofthisapproach dependsonthesetting,andmayrequireshortcommutedistancesoravailabilityofsuitablesleepingquartersneartheworksite .Hospitals,airlinesandotheraround-the-clock operationshaveinvestedinon-sitesleepingfacilitiestomanagefatiguethisway.In long-haultruckdriverswithaccesstoasleeperberth,splitsleepscheduleseffectively mitigatenighttimefatigue.Researchhasindicatedthatsleepschedulessplitintoa dailyanchorsleepperiodofbetweenfourandsixhoursandadailynapperiodofupto abouttwohoursproducealevelofrecuperationapproximatelyequivalenttowhat wouldhavebeenachievedwiththesametotalamountofsleeptakenatnight.In addition,anchorsleepstrategies(withorwithoutadaytimenap)appeartobehelpful inkeepingthecircadianrhythmalignedwiththelight/darkcycle.Splittingsleep "
ABSTRACT: In most occupational settings, a primary reason for fatigue is incompatible timing of duty schedules relative to circadian (i.e., 24-hour) rhythm and the need for sleep. This review describes the sleep-related neurobiology of fatigue; factors in the operational environment that contribute to fatigue; and the effects of fatigue on cognitive performance that lead to errors, incidents, and accidents. A range of fatigue countermeasures are reviewed, broadly categorized as preventive countermeasures and operational countermeasures. Fatigue-related optimization of duty schedules and fatigue risk management systems are discussed as comprehensive ways to reduce fatigue and increase safety while maintaining productivity and operational integrity. Occupational fatigue is of significant concern at the individual, organizational, and societal levels, and strategies have been developed to help successfully manage and mitigate fatigue at each level.07/2013; 1(3):118-136. DOI:10.1080/21641846.2013.798923