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Reaction Time

Reaction time refers to one's reflexes and the speed of which a task can be done, and is a cognitive parameter that is of interest to athletes or persons in need of more rapid coordination.

Research analysis led by Kamal Patel.
All content reviewed by the Examine.com Team. Published: Jul 5, 2013
Last Updated:

Human Effect Matrix

The Human Effect Matrix looks at human studies (it excludes animal and in vitro studies) to tell you what supplements affect reaction time
Grade Level of Evidence
Robust research conducted with repeated double-blind clinical trials
Multiple studies where at least two are double-blind and placebo controlled
Single double-blind study or multiple cohort studies
Uncontrolled or observational studies only
Level of Evidence
? The amount of high quality evidence. The more evidence, the more we can trust the results.
Outcome Magnitude of effect
? The direction and size of the supplement's impact on each outcome. Some supplements can have an increasing effect, others have a decreasing effect, and others have no effect.
Consistency of research results
? Scientific research does not always agree. HIGH or VERY HIGH means that most of the scientific research agrees.
Notes
grade-b Minor Moderate See all 5 studies
Although the overall effect is unreliable and context dependent, caffeine appears to improve reaction time (possibly at the cost of accuracy)
grade-b Minor High See all 3 studies
An improvement in reaction time (decrease) is noted in both healthy and normal persons as well as those undergoing either drug addiction or sleep deprivation. This may be related to the alertness promoting effects of the compound.
grade-c Notable - See study
The one study to measure reaction time noted an astounding decreased (approximately 40% reduction), which needs to be replicated
grade-c Minor - See study
A low dose, yet not the higher antifatigue dose, has once been noted to improve reaction time and shooting accuracy following an hour long basketball game
grade-c Minor - See study
A (beneficial) decrease in reaction time has been noted during a stimulated soccer test, which was thought to be secondary to the antifatigue effects. Hypothesized to be useful for prolonged sports
grade-c Minor Moderate See 2 studies
There are decreases in reaction time when otherwise healthy older adults take this supplement (youth not tested) which span to choice recognition, and spatial memory reaction time but not digit vigilance and simple reaction time.
grade-c Minor - See study
A reduction in reaction time has been noted with fish oil supplementation in persons who consume low levels of fish in the diet
grade-c Minor - See study
A decrease in reaction time has been noted to be secondary to improvements in cognition in older women; no studies in youth at this moment in time.
grade-c Minor - See 2 studies
Alongside improvements in general cognition in older individuals, an improvement in reaction time has been noted.
grade-c Minor - See study
A reduction in reaction time has been noted in acute users of marijuana relative to control. While not directly tested, it is thought that this is attenuated during tolerance.
grade-c Minor - See study
A decrease in reaction time is noted with acute nicotine ingestion
grade-c Minor Moderate See 2 studies
Mixed effects on reaction time, with a possible decrease occurring
grade-c Minor - See study
Reductions in reaction time were not overly significant.
grade-c Minor - See study
High doses (40mg) may reduce reaction time during tested, with lower doses not being potent enough to influence reaction time
grade-c Minor - See study
A slight decrease in reaction time has been noted in persons who are zinc deficient and then supplemented with zinc.
grade-c - - See study
No significant alterations in reaction time noted with choline
grade-c - - See study
When 2.1g D-serine is taken two hours prior to cognitive testing, there does not appear to be an increase in reaction time when compared to placebo
grade-c - - See study
The dose of PRL-8-53 that improves memory formation does not appear to have any significant influence on reaction time.
grade-c - - See study
No significant alterations in reaction time during treatment of cognitive decline
grade-c - - See study
No significant influences on reaction time
grade-c - Very High See 2 studies
In response to cognitive testing involving reaction time, administration of Kanna prior to testing does not appear to outperform place in improving reaction time.
grade-c - - See study
grade-d Minor - See study
An improvement has been noted in a small study in healthy people. The results need replication.