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Dr. Gaila Mackenzie-Strawn

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l-Theanine Reduces Stress Response

On : 03 January, 2013

In : Stress

1 Comments

l-Theanine reduces psychological and physiological stress responses.
Biol Psychol. 2006 Aug 21; Nagoya University Department of Psychology, Chikusa-ku, Nagoya, 464-8601, Japan.
Because the characteristics of l-Theanine suggest that it may influence psychological and physiological states under stress, the present study examined these possible effects in a laboratory setting using a mental arithmetic task as an acute stressor. Twelve participants underwent four separate trials: one in which they took l-Theanine at the start of an experimental procedure, one in which they took l-Theanine midway, and two control trials in which they either took a placebo or nothing. The experimental sessions were performed by double-blind, and the order of them was counterbalanced. The results showed that l-Theanine intake resulted in a reduction in the heart rate (HR) and salivary immunoglobulin A (s-IgA) responses to an acute stress task relative to the placebo control condition. Moreover, analyses of heart rate variability indicated that the reductions in HR and s-IgA were likely attributable to an attenuation of sympathetic nervous activation. Thus, it was suggested that the oral intake of l-Theanine could cause anti-stress effects via the inhibition of cortical neuron excitation. l-Theanine reduces psychological and physiological stress responses

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