Advance Access Publication 15 June 2007 eCAM 2009;6(1)107–112 doi:10.1093/ecam/nem065 Original Article Variation Analysis of Sphygmogram to Assess Cardiovascular System under Meditation Chuan-Yi Liu 1 , Ching-Chuan Wei 2 and Pei-Chen Lo 1 1 Institute of Electrical and Control Engineering, National Chiao Tung University and 2 Department of Computer and Communication Engineering, Asia University, National Chiao Tung University, Taiwan In this article, we studied how meditation affects the characteristics of the cardiovascular system, mainly based on blood pressure waveforms (BPW). Four parameters derived from BPW include the rising slope ( h 1 / t 1 ), normalized height of T wave ( h 3 / h 1 ), normalized height of V 3 valley ( h 4 / h 1 ) and normalized height of D wave ( h 5 / h 1 ), where t 1 and h i , i ¼ 1, ... ,5 are quantitative features of the BPW waveform pattern. A larger value of h 1 / t 1 reflects better heart ejection ability and aorta compliance. A larger value of h 3 / h 1 may infer an arterial system with good elasticity. The decrease (increase) of h 4 / h 1 parameter indicates the decrease (increase) of peripheral resistance of vessels. A larger value of h 5 / h 1 indicates better artery elasticity and aortic valve function. In comparison with the control group, Zen-meditation practitioners have more after-meditation h 1 / t 1 , h 3 / h 1 and h 5 / h 1 increase, with more h 4 / h 1 decrease, with statistical significance ( P 5 0.05). The observation allows us to infer that Zen meditation may effectively improve relevant characteristics of the cardiovascular system.
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