Effects of time-of-day and caffeine ingestion on mood states, simple reaction time, and short-term maximal performance in elite judoists

Abstract Introduction Many workers and students experience regular sleep deprivation and daytime sleepiness when they are expected to be performing at their best. The purpose of the current research was to investigate the potential effect of short-term bright green light exposure on daytime performance and sleepiness in partially sleep-deprived persons. Methods Participants were 30 students (19.4±0.89 years; 20 females). On Day 1, participants were loaned a Fitbit to provide an objective measure of activity/sleep and were instructed to sleep no more than 5 hours that night. On Day 2, participants provided information on their sleep time for the previous night and were randomly assigned to a bright light condition (bright green light, 381 Lux) or a standard light condition (control condition, indoor florescent light, 139 Lux). They completed a simple reaction time task, the Arrow Flankers task to measure cognitive inhibition, and the Stanford Sleepiness Scale during three testing periods (baseline, after 20 minutes of light exposure, and after 60 minutes of light exposure). Between the testing periods, participants read a non-fiction book while exposed to their respective light condition. At the end of the study, participants returned their FitBit. Results The Fitbit and self-report sleep data indicated that participants slept 4.9 hours the night between Day 1 and Day 2. Mixed 2 (light condition) x 3 (testing period) ANOVAs indicated that the bright green light condition resulted in a significant decrease in reaction time on the Flankers task but had no significant effect on simple reaction time or subjective sleepiness. Conclusion The current findings suggest that 60 minutes of bright green light exposure could improve performance on a cognitive inhibition task. This suggests that bright green light exposure could be a useful countermeasure for cognitive performance decrements in settings where sleep deprivation is common. Support None to report.

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Diurnal Variation in Visual Simple Reaction Time between and within Genders in Young Adults: An Exploratory, Comparative, Pilot Study

The Scientific World JOURNAL ◽

10.1155/2021/6695532 ◽

2021 ◽

Vol 2021 ◽

pp. 1-5

Author(s):

Hanumantha S ◽

Ashwin Kamath ◽

Rajeshwari Shastry

Keyword(s):

Reaction Time ◽

Pilot Study ◽

Simple Reaction Time ◽

Time Of Day ◽

Practice Session ◽

Language Version ◽

Simple Reaction ◽

Parallel Group ◽

Significant Difference ◽

Time Required

Simple reaction time (SRT) is the minimum time required to respond to a stimulus; it is a measure of processing speed. Our study aimed to determine the variation in visual SRT with time among individuals of the same gender and between genders. We carried out a prospective, parallel group, pilot study involving ten male and ten female medical students aged 18–25 years. After obtaining written informed consent, the participants were familiarized with the procedures, and each completed a single practice session of a computerized visual SRT which was administered using Psychology Experiment Building Language Version 2.0 software. On a predetermined day, the participants completed the exercise at 10 a.m., 1 p.m., and 5 p.m. The results showed no statistically significant difference in SRT based on time of day between genders (χ2(2) = 4.300, p = 0.116 ) as well as within gender (males (χ2(2) = 0.600, p = 0.741 ); females (χ2(2) = 5.000, p = 0.082 ). Our study showed that visual SRT does not change significantly at different times of the day and within and between genders. Intraindividual variations in visual SRT can mask the presence of a small but significant difference; hence, further studies are warranted.

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The effects of caffeine ingestion on the reaction time and short-term maximal performance after 36h of sleep deprivation

Physiology & Behavior ◽

10.1016/j.physbeh.2014.04.012 ◽

2014 ◽

Vol 131 ◽

pp. 1-6 ◽

Cited By ~ 19

Author(s):

Makram Souissi ◽

Hamdi Chtourou ◽

Salma Abedelmalek ◽

Imen Ben Ghozlane ◽

Zouhair Sahnoun

Keyword(s):

Reaction Time ◽

Sleep Deprivation ◽

Short Term ◽

Caffeine Ingestion ◽

Maximal Performance

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Vasopressin and memory: improvement in normal short-term recall and reduction of alcohol-induced amnesia

Psychological Medicine ◽

10.1017/s0033291700024879 ◽

1987 ◽

Vol 17 (2) ◽

pp. 335-341 ◽

Cited By ~ 17

Author(s):

Keith Millar ◽

William J. Jeffcoate ◽

Cristine P. Walders

Keyword(s):

Reaction Time ◽

Arginine Vasopressin ◽

Simple Reaction Time ◽

Short Term Memory ◽

Semantic Retrieval ◽

Healthy Male ◽

Short Term ◽

Term Memory ◽

Simple Reaction ◽

Memory Improvement

SynopsisThe vasopressin analogue 1-desamino-8-D-arginine vasopressin (DDAVP) has been shown in healthy male volunteers to cause significant improvement in short-term memory and to reduce alcohol-induced amnesia. There was no significant effect upon semantic retrieval or simple reaction time. It was concluded that vasopressin benefited the initial processes of consolidation and learning, while the reduction of the amnesic effects of alcohol may support the contentions of other authors that the peptide improves memory in states of mild amnesia.

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Simple Reaction Time Test

PsycTESTS Dataset ◽

10.1037/t05446-000 ◽

2012 ◽

Keyword(s):

Reaction Time ◽

Simple Reaction Time ◽

Simple Reaction ◽

Time Test ◽

Reaction Time Test

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Manipulations of the Response-Stimulus Intervals as a Factor Inducing Controlled Amount of Reaction Time Intra-Individual Variability

Brain Sciences ◽

10.3390/brainsci11050669 ◽

2021 ◽

Vol 11 (5) ◽

pp. 669

Author(s):

Paweł Krukow ◽

Małgorzata Plechawska-Wójcik ◽

Arkadiusz Podkowiński

Keyword(s):

Reaction Time ◽

Simple Reaction Time ◽

Reaction Times ◽

Reaction Time Task ◽

Assessment Method ◽

Individual Variability ◽

Simple Reaction Time Task ◽

Stimulus Interval ◽

Simple Reaction ◽

Response Stimulus

Aggrandized fluctuations in the series of reaction times (RTs) are a very sensitive marker of neurocognitive disorders present in neuropsychiatric populations, pathological ageing and in patients with acquired brain injury. Even though it was documented that processing inconsistency founds a background of higher-order cognitive functions disturbances, there is a vast heterogeneity regarding types of task used to compute RT-related variability, which impedes determining the relationship between elementary and more complex cognitive processes. Considering the above, our goal was to develop a relatively new assessment method based on a simple reaction time paradigm, conducive to eliciting a controlled range of intra-individual variability. It was hypothesized that performance variability might be induced by manipulation of response-stimulus interval’s length and regularity. In order to verify this hypothesis, a group of 107 healthy students was tested using a series of digitalized tasks and their results were analyzed using parametric and ex-Gaussian statistics of RTs distributional markers. In general, these analyses proved that intra-individual variability might be evoked by a given type of response-stimulus interval manipulation even when it is applied to the simple reaction time task. Collected outcomes were discussed with reference to neuroscientific concepts of attentional resources and functional neural networks.

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