Objective:To investigate the changes in radial pulse induced by thermal stresses(TSs).Methods:Sixty subjects were enrolled.Using an open-label,2x2 crossover randomization design,both feet of each subject were immersed...Objective:To investigate the changes in radial pulse induced by thermal stresses(TSs).Methods:Sixty subjects were enrolled.Using an open-label,2x2 crossover randomization design,both feet of each subject were immersed in 15%:water for cold stress(CS)and in 40 X:water for heat stress(HS)for 5 min each.Radial pulse,respiration and electrocardiogram(ECG)signals were recorded before,during and immediately after the TSs.Results:The an alysis of heart rate variability revealed that CS in creased the low-freque ncy(LF)and high-frequency(HF)components(P<0.05)and that HS reduced the LF and HF components(P<0.01).Both TSs reduced the normalized LF,increased the normalized HF,and reduced the LF/HF ratio.The differences in the ECG signals were more dominant during the TS sessions,but those in the radial pulse signals became more domi nant immediately after the TS sessi ons.CS decreased the pulse depth(P<0.01)and in creased the radial augme ntation in dex(P<0.1),and HS in creased the pulse pressure(P<0.1)and sube ndocardial viability ratio(P<0.01).There were no significant differences in pulse rate during the three time sequences of each TS.The respiration rate was increased(P<0.1),and the pulse rate per respiration(P/R ratio)was significantly decreased(P<0.05)with CS.The HF region(10-30 Hz)of the pulse spectral density was suppressed during both TSs.Conclusions:CS induced vasoconstriction and sympathetic reactions,and HS induced vasodilation and parasympathetic reacti ons.Based on defi nitions used in pulse diag no sis,we made the novel discoveries that the pulse became slower(decreased P/R ratio),more floating and tenser under CS and that the HF region of the spectral power decreased significantly under both TSs.展开更多
基金Supported by the Korea Institute of Oriental Medicine funded by the Korean government(No.K17021)。
文摘Objective:To investigate the changes in radial pulse induced by thermal stresses(TSs).Methods:Sixty subjects were enrolled.Using an open-label,2x2 crossover randomization design,both feet of each subject were immersed in 15%:water for cold stress(CS)and in 40 X:water for heat stress(HS)for 5 min each.Radial pulse,respiration and electrocardiogram(ECG)signals were recorded before,during and immediately after the TSs.Results:The an alysis of heart rate variability revealed that CS in creased the low-freque ncy(LF)and high-frequency(HF)components(P<0.05)and that HS reduced the LF and HF components(P<0.01).Both TSs reduced the normalized LF,increased the normalized HF,and reduced the LF/HF ratio.The differences in the ECG signals were more dominant during the TS sessions,but those in the radial pulse signals became more domi nant immediately after the TS sessi ons.CS decreased the pulse depth(P<0.01)and in creased the radial augme ntation in dex(P<0.1),and HS in creased the pulse pressure(P<0.1)and sube ndocardial viability ratio(P<0.01).There were no significant differences in pulse rate during the three time sequences of each TS.The respiration rate was increased(P<0.1),and the pulse rate per respiration(P/R ratio)was significantly decreased(P<0.05)with CS.The HF region(10-30 Hz)of the pulse spectral density was suppressed during both TSs.Conclusions:CS induced vasoconstriction and sympathetic reactions,and HS induced vasodilation and parasympathetic reacti ons.Based on defi nitions used in pulse diag no sis,we made the novel discoveries that the pulse became slower(decreased P/R ratio),more floating and tenser under CS and that the HF region of the spectral power decreased significantly under both TSs.
