Nattokinase aids cold recoveryA single dose of oral nattokinase accelerates skin temperature recovery after cold water immersion: A double-blind, placebo-controlled crossover study.
We conducted a study to explore how a single dose of nattokinase (NK) influences recovery of skin temperature after exposure to cold water. This double-blind, placebo-controlled crossover study involved nine healthy men who took either NK or a placebo before submerging their hands in ice-cold water at 10 °C for one minute.
Our findings showed that participants who took NK experienced a quicker recovery of skin temperature in their middle finger, palm, and back of the hand compared to those who took the placebo. Although cold exposure initially caused a significant drop in skin temperature, the NK appeared to accelerate the warming process afterward.
Interestingly, we did not observe any changes in heart rate, cardiac output, or sympathetic nervous activity as a result of taking NK. This is noteworthy because it suggests that while NK may help with temperature recovery, it does not impact certain cardiovascular responses typically associated with cold exposure.
Overall, our study highlights the potential benefits of nattokinase, especially for individuals who are more sensitive to cold, such as women and the elderly. It could offer a new avenue for managing cold sensitivity and minimizing excessive vasoconstriction during chilly conditions.
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