Probe Reaction Time Changes with Fatigue Induced by Climbing Up- and -Down Stairs

BACKGROUND: Time change (which can lead to sleep duration decrements) can lead to brain dysfunction if repeated. In the present study, cognitive functions of the volunteers were evaluated before and after the time changes in Tehran.METHODS: Eleven, voluntary healthy persons (21±2 year old) were evaluated for their cognitive functions including sustain attention, reaction time, and mental fatigue twenty-one days before the time changes and thirty-eight days after time change using PASAT software. In addition, plasma cortisol level was measured before and after the time changes.RESULTS: After the time changes salivary cortisol concentration increase, but general mental health was decreased. Sustain attention was shortened after time change which was significantly different compared with before the time changes. Reaction time was increased after the time changes in comparison with the before the time changes, but was not statistically significant. In addition, mental fatigue was increased after the time changes.CONCLUSION: It seems that time change may reduce brain cognitive functions which are manifested by general mental health, sustain attention reduction, reaction time as well as mental fatigue.

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Assessment of Urban Railway Transit Driver Workload and Fatigue under Real Working Conditions

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198119826071 ◽

2019 ◽

Vol 2673 (11) ◽

pp. 891-900

Author(s):

Yuan-chun Huang ◽

Lan-peng Li ◽

Zhi-gang Liu ◽

Hai-yan Zhu ◽

Lin Zhu

Keyword(s):

Reaction Time ◽

Working Conditions ◽

Night Shift ◽

Driving Mode ◽

Autonomous Mode ◽

Driver Workload ◽

Driving Workload ◽

Significant Regression ◽

Time Changes ◽

Fatigue Driving

This paper describes an experiment conducted to establish a workload model by employing physiological methods to measure driver workload and fatigue under real working conditions. Experienced healthy metro drivers were selected as subjects; they performed normal schedules during which simultaneous electrocardiogram (ECG) recording was used to assess their levels of fatigue. Then, subjective workload assessment and reaction time tests were conducted during each break interval to monitor the drivers’ physiological and psychological performance. Based on task analysis, driving workload models with time weight parameters of four types of tasks were established and the workload real-time changes during different shifts were evaluated. The results demonstrate that workload tends to increase over time and it is significantly higher during manual driving mode than autonomous mode ( p = 0.015 < 0.05). Driving fatigue occurs earlier in the night shift than in the day shift according to ECG spectrum analysis results. Although the results of reaction time tests show no significance ( p = 0.917 > 0.05), the increase in the number of reaction errors after fatigue driving indicates a reduction in drivers’ cognitive ability. Regression analysis shows a significant regression relationship with a mutual incentive effect between workload and fatigue in three shifts ( R2 > 0.4). These will be used as a future reference for fatigue research and to help develop reasonable schedules to ensure operational safety.

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Determination Of Reaction Time Changes Per Time Unit In Clot Assays

10.1055/s-0038-1653053 ◽

1981 ◽

Author(s):

Lj Popović

Keyword(s):

Reaction Time ◽

Standard Sample ◽

Reaction Times ◽

Test Sample ◽

Total Reaction ◽

The Difference ◽

Time Changes ◽

Total Reaction Time

Changes in reaction time of clot assays are usually expressed only in time units, which fails to indicate the extent of the increase or decrease of the reaction time of the tested specimens against that of the basic sample. Reaction time increases of, e.g. , 6 seconds in tested samples, compared to basic sample reaction times of 12 and 24 seconds respectively, signify an increase twice as large in the first as in the second instance.Changes in reaction time of clot assays can be expressed as the increment or decrement of the reaction time per time unit. This amount of increase or decrease (positive or negative alteration of reaction time, T a ) can be expressed as the quotient of the difference between the reaction times of the tested (T x ) and basic (To) samples and of the basic sample, e.g. in seconds per second, T a =T x -To/To. A test sample reaction time 6 seconds longer than basic sample reaction times of 12 and 2k seconds would mean an increase of 0.5 and 0.25 seconds per second, respectively.Reaction time changes of tested samples against that of the standard sample (T std ) can be calculated in a similar way, T a =T x -T std /T std .It can be assumed that this parameter reflects the intensity of the increase or decrease of reaction time per time unit. The quotient of the tested and basic samples can be considered as the coefficient of the increase or decrease of the total reaction time (CT=T x /To).

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Reaction time changes with the hazard rate for a behaviorally relevant event when monkeys perform a delayed wrist movement task

Neuroscience Letters ◽

10.1016/j.neulet.2007.12.063 ◽

2008 ◽

Vol 433 (2) ◽

pp. 152-157 ◽

Cited By ~ 11

Author(s):

Yoshiaki Tsunoda ◽

Shinji Kakei

Keyword(s):

Reaction Time ◽

Hazard Rate ◽

Wrist Movement ◽

Time Changes

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Relationship between Probe Reaction Time during Walking and Falls for Patients with Post-Stroke Hemiplegia

Journal of Physical Therapy Science ◽

10.1589/jpts.21.349 ◽

2009 ◽

Vol 21 (4) ◽

pp. 349-354 ◽

Cited By ~ 2

Author(s):

Ming Huo ◽

Hitoshi Maruyama ◽

Lijia Chen

Keyword(s):

Reaction Time ◽

Post Stroke ◽

Probe Reaction Time

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Priming to Promote Fluent Motor Skill Execution: Exploring Attentional Demands

Journal of Sport and Exercise Psychology ◽

10.1123/jsep.2013-0085 ◽

2014 ◽

Vol 36 (4) ◽

pp. 366-374 ◽

Cited By ~ 1

Author(s):

Danielle Adams ◽

Kelly J. Ashford ◽

Robin C. Jackson

Keyword(s):

Reaction Time ◽

Completion Time ◽

Reaction Time Task ◽

Soccer Players ◽

Task Completion ◽

Focused Attention ◽

Attentional Demands ◽

Skilled Performance ◽

Probe Reaction Time ◽

Speed And Accuracy

The effect of priming on the speed and accuracy of skilled performance and on a probe-reaction time task designed to measure residual attentional capacity, was assessed. Twenty-four skilled soccer players completed a dribbling task under three prime conditions (fluency, skill-focus, and neutral) and a control condition. Results revealed changes in trial completion time and secondary task performance in line with successfully priming autonomous and skill-focused attention. Retention test data for task completion time and probe-reaction time indicated a linear decrease in the priming effect such that the effect was nonsignificant after 30 min. Results provide further support for the efficacy of priming and provide the first evidence of concurrent changes in attentional demands, consistent with promoting or disrupting automatic skill execution.

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