Far-infrared Ray Effect on CV12 Acupoint

Inclusion Criteria: * Healthy adult volunteers, male or female, ages between 20 and 40 years * Neurological and physical examination without abnormal functions * Far-infrared ray illumination without allergic reaction and contra- indication * The participants were explained the objective of the study, agreed to accept the test and signed a letter of consent Exclusion Criteria: * People less than 20 years of age or more than 40 years * Women in pregnant or lactating * People with mental or behavioral anomalies could not follow the researchers * People suffered from serious diseases such as myocardial infarction , heart failure, serious arrhythmia, hypertension, diabetes, autoimmune disease, chronic obstructive pulmonary diseases, and kidney failure, liver cirrhosis and cancer * People suffered from limb edema and serious skin diseases * People did not sign a letter of consent