Tea lowers anxiety, blood pressure

A new study supports earlier evidence that tea can not only reduce blood pressure but also calm anxiety, despite its caffeine content.

Japanese researchers tested two compounds found in tea – L-theanine, the amino acid contained in tea leaves, and caffeine – and their effect in the body when under stress.

They enlisted 14 subjects who underwent three separate trials, in which they took L-theanine and a placebo, caffeine and a placebo, or a placebo only, the Journal of Physiological Anthropology reports.

The subjects were then asked to complete mental activities under varying degrees of stress, such as solving arithmetic questions with their non-dominant hand submerged in a bucket of ice water.

Ai Yoto and her team from the University of Shizuoka found that L-theanine significantly inhibited the blood pressure increases in a high-response group, which consisted of subjects whose blood pressure rose more than average while performing a mental task after taking a placebo.

Caffeine also had an effect on blood pressure but to a lesser degree than L-theanine.

In addition, the L-theanine was shown to reduce tension-anxiety scores on mood tests.

This article is tagged with the following keywords. Find out more about My Tags

Comment & Question

Commenter icon key: Subscriber Verified

Post New comment or question

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.

NZ Market Snapshot

Forex

Sym Price Change
USD 0.7883 0.0006 0.08%
AUD 0.9199 -0.0030 -0.33%
EUR 0.6307 0.0009 0.14%
GBP 0.4993 0.0005 0.10%
HKD 6.1123 0.0067 0.11%
JPY 92.6830 0.0360 0.04%

Commods

Commodity Price Change Time
Gold Index 1196.6 -0.500 2014-11-26T00:
Oil Brent 79.4 -0.640 2014-11-26T00:
Oil Nymex 73.7 -0.400 2014-11-26T00:
Silver Index 16.6 0.000 2014-11-26T00:

Indices

Symbol Open High Last %
NZX 50 5457.4 5462.1 5457.4 -0.10%
NASDAQ 4760.2 4788.0 4758.3 0.61%
DAX 9894.6 9942.7 9861.2 0.55%
DJI 17812.2 17833.8 17814.9 0.07%
FTSE 6731.1 6765.0 6731.1 -0.03%
HKSE 24169.8 24228.1 24112.0 -0.18%
NI225 17310.5 17346.8 17383.6 -0.30%