Unique ID issued by UMIN | UMIN000019411 |
---|---|
Receipt number | R000022449 |
Scientific Title | Effect of low-caffeine green tea against sleep and stress in the middle-aged people |
Date of disclosure of the study information | 2015/11/06 |
Last modified on | 2017/08/07 19:58:55 |
Effect of low-caffeine green tea against sleep and stress in the middle-aged people
Sleep and stress in the middle age
Effect of low-caffeine green tea against sleep and stress in the middle-aged people
Sleep and stress in the middle age
Japan |
Sleep, Stress
Not applicable | Adult |
Others
NO
Effects of green tea with lowered caffeine against sleep and stress are examined in the middle-aged people.
Efficacy
Exploratory
Pragmatic
Not applicable
Alterations in brain waves and salivary amylase activity in the middle-aged people that drank green tea with lowered caffeine
Physical condition, Sleeping time, Replying to a questionnaire (subjective stress)
Interventional
Cross-over
Randomized
Individual
Double blind -all involved are blinded
Placebo
YES
YES
No need to know
2
Prevention
Food |
Low-caffeine green tea, for 1 week
Green tea, for 1 week
40 | years-old | <= |
65 | years-old | >= |
Male and Female
Middle-aged people, who are working in Kakegawa City Hall
Obtained written informed consent from the middle-aged people before the participation
Possible to take green tea everyday
Possible to check salivary amylase activity two times per day
Possible to measure brain waves
Taking sleep-inducing drug and tranquilized; Smoker; Diagnosed as inadequate to participate in the study by a doctor
20
1st name | |
Middle name | |
Last name | Keiko Unno |
University of Shizuoka
School of Pharmaceutical Sciences
52-1 Yada, Suruga-ku, Shizuoka
054-264-5731
kendaiunno@gmail.com
1st name | |
Middle name | |
Last name | Keiko Unno |
University of Shizuoka
School of Pharmaceutical Sciences
52-1 Yada, Suruga-ku, Shizuoka
054-264-5731
kendaiunno@gmail.com
University of Shizuoka
University of Shizuoka
Local Government
Japan
NO
掛川市役所 / Kakegawa City Hall
2015 | Year | 11 | Month | 06 | Day |
Published
We examined the effects of green tea with lowered caffeine content (LCGT) on stress and quality of sleep of middle-aged individuals (n=20) in a double-blind crossover design. Standard green tea (SGT) was used as the control. The level of salivary amylase activity (sAA), a stress marker, was significantly lower in participants that consumed LCGT than in those that consumed SGT. Sleep quality was higher in participants that consumed a larger quantity of LCGT. In addition, a self-diagnostic check for accumulated fatigue was significantly lower in those participants that consumed LCGT than SGT. These results indicate that LCGT intake can reduce stress in middle-aged individuals and improve their quality of sleep. The reduction in caffeine is suggested to be a valid reason for enhancing the anti-stress effect of green tea.
Completed
2015 | Year | 11 | Month | 06 | Day |
2015 | Year | 11 | Month | 06 | Day |
2015 | Year | 12 | Month | 04 | Day |
2016 | Year | 12 | Month | 31 | Day |
2016 | Year | 12 | Month | 31 | Day |
2017 | Year | 12 | Month | 31 | Day |
Nutrients, 9, 777, 2017
2015 | Year | 10 | Month | 19 | Day |
2017 | Year | 08 | Month | 07 | Day |
Value
https://center6.umin.ac.jp/cgi-open-bin/ctr_e/ctr_view.cgi?recptno=R000022449