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Roasted Barley Extract (Mugicha) Containing Cyclo(D-Phe-L-Pro) Prevents a Decrease in Skin Temperature in Cold

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Roasted barley extract (RBE) containing cyclo(d-Phe-l-Pro) helps maintain higher skin temperatures in cold conditions. This traditional Japanese beverage demonstrated effectiveness in both men and women, preventing significant skin temperature drops.

Keywords:
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Area of Science:

  • Human Physiology
  • Nutritional Science
  • Thermophysiology

Background:

  • Roasted barley extract (RBE) is a traditional Japanese beverage with potential physiological effects.
  • Previous research indicated RBE containing cyclo(d-Phe-l-Pro) influences blood flow and skin temperature recovery in women.
  • The efficacy of RBE on skin temperature regulation in men was previously unclear.

Purpose of the Study:

  • To investigate the effects of RBE containing cyclo(d-Phe-l-Pro) on skin temperature in men and women under controlled cold air exposure.
  • To determine if RBE can prevent decreases in skin temperature in excessively air-cooled environments.

Main Methods:

  • A randomized, double-blind, placebo-controlled study was conducted.
  • Participants ingested either RBE or a placebo beverage and remained in a cooled room (25.5±0.5ºC) for 100 minutes.
  • Infrared thermography was used to measure left foot skin temperature every 5 minutes; paired t-tests analyzed the data.

Main Results:

  • The RBE group maintained significantly higher skin temperatures compared to the placebo group.
  • Overall, skin temperature changes after 100 minutes were -3.67±1.14ºC for RBE versus -4.59±0.89ºC for placebo.
  • RBE demonstrated efficacy in both male and female participants, with skin temperature changes of -3.65±0.64ºC (RBE) and -4.55±0.32ºC (placebo) in men.

Conclusions:

  • Roasted barley extract containing cyclo(d-Phe-l-Pro) effectively prevents skin temperature decrease in excessively air-cooled conditions.
  • The thermoregulatory benefits of RBE were confirmed in both male and female participants.
  • RBE represents a potential dietary intervention for maintaining body temperature in cold environments.