Studies related to Motor Speed and Theanine

Effects Of L-Theanine Administration On Stress-Related Symptoms And Cognitive Functions In Healthy Adults: A Randomized Controlled Trial

Effect None
Values BACS. Mean and SD. Placebo: before 83.2 ± 13.0, after 83.6 ± 13.3. Theanine: before 83.7 ± 12.6, after 84.0 ± 12.5
Trial Design Randomized trial
Trial Length 2-4 Weeks
Number of Subjects 30
Sex Both Genders
Age Range 18-29, 30-44, 45-64, 65+
Notes for this study:
Each night of this 4-week (per treatment) randomized, controlled trial crossover, 30 healthy participants took 200 mg of l-theanine (suntheanine) or placebo before sleep.

Anxiety, sleep quality, and depression were the primary outcomes, and there was a statistically significantly greater improvement for all compared with baseline, which became greater after 4 weeks compared with 2 weeks. There wasn't a statistically significantly greater improvement compared with placebo, though there was a greater improvement for all.

Measures of verbal fluency and executive function were improved more when taking theanine, whereas the trail-making test score improved more in the placebo group. However, these differences weren't statistically significant compared with each other, only when compared with baseline. Analyses stratified by the median split based on the mean pretreatment scores found that the lower half score on verbal fluency and letter fluency in the lower half was improved more when taking theanine.
Funding issues for this study:
"This study was supported by funding received from Taiyo Kagaku Co., Ltd., Mie, Japan. Yasukawa Z. and Ozeki M. are employees of Taiyo Kagaku Co., Ltd. which supplied the L-theanine and placebo tablets used in this trial."

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