Medicine:
Engineering: Innovation: A Method for
Measuring the Flexibility of Blood Vessels
Using a Blood
Pressure Meter
by Keiji Taniguchi1, Hiroshi Yamamoto2 , Ningfeng Zeng3, and Kengo Kashihara4 1 Honorary Professor of Fukui
University, Fukui, 918-8186, Japan, and Xifan University of Technology, Xifan ,
China 2 CEO , Sakaimed.Co.,
Shinjiku,Tokyo,162-0801,Japan 3
Japanese Society of Anti-aging Medicine , Kobe City, 651-2122, Japan 4Kashihara
Neurological Clinic, Fukui, Japan, A simple method for measuring the flexibility
of blood vessels in a human body
is proposed. This method
can measure the flexibility of blood vessels simply and economically. The
correlation coefficient between our
method and the baPWV method is more than -0.9. Index Terms — Flexibility of blood vessels Introduction: In a blood pressure
measurement, a blood vessel stopped the flow of blood by the cuff must be
equivalently vibrated just like a spring motion by a pumping action of the
heart. In this case, the transient temperature variation of
an arterial systolic maximum value caused by a heat stimulation may be able to use as
an index which expresses a flexibility of
the blood vessel. In this paper, the recent result updated for reference
[1] is shown. The baPWV method (See Fig.4), which is used as a conventional method, is used for the calibration of our method. Our
experimental result shows that this proposed method has an excellent correlation with the baPWV method [2]. Consequently, our method can be used for
measuring the flexibility of blood vessels simply and economically. 2.Method: A. Relationship between Blood Pressure and Body
Temperature The relationships among the arterial systolic
maximum value
Let us consider the case of small changes
In the above
equation, if the diameter of the blood vessel is increased by the temperature
variation (
From Eqs. (1)
and (2) , the following equation
can be obtained: where
if B. Body
Temperature Variation The small variation A rectangular-wave form expressed as a function of time
is used as the heat stimulation source. As an example, when a microwave oven of 600(watts) about
50Ž-water of 260(cc) for drinking can be obtained. C. Analysis
(A) First of all, variables and
functions in Equations (1)
and (2)
are substituted as follows: ,
Consequently, the following equation can be
obtained:
Where From this table, the following descriptions are
obtained:
These data were measured by
using a blood pressure meter specified as: OMRON HEM-7230. (B) Let us show the computation process using the samples measured
previously. From Equation (3), the values of
Where,
The baPWV average value, which
corresponds to
Table 1
Relationship among
D. Evaluation Results As a criterion of the evaluation of our method, the baPWV
values are used. The relationship between The
correlation coefficient between the baPWV method and our method is more than -0.9. From
this result, our method has excellent
correlation with the baPWV method. This relation is shown by solid line in
Fig.1. The equation of this line
can be approximated as follows:
E. Day-Time Series Variations The relationship between R and daytime series
variations between April 2, 2015 and April 15, 2015 is shown in Fig.2.
Figs 2 (a) and (b) express the values of R for day time
series variations, and a relation between baPWV and R, respectively. F. R and Age Relations A sky-blue line shown in Fig.3 expresses the relationship between ![]() In
this figure, each zone expressed by the blue, pink, and yellow is the stiff
blood vessel zone, slightly hard blood vessel zone, and flexible blood vessel
zone, respectively. 3.
Conclusion: This
method can be used to measure the flexibility of blood vessel in a human body simply and economically. The proposed method has excellent correlation with baPWV method. The advantage of our method is that it can
measure easily by using a blood pressure meter and a timer as measuring
equipment. In an ageing society, this simple method will be able to play
an important role for preventing metabolic
syndrome in elder people. 4. Appendix Fig.4 shows an example of the relationship between
baPWV and age. ![]() References: [1] Keiji Taniguchi,
Hiroshi Yamamoto, and Ningfeng Zeng: Certificate of Patent,
No.5518554, April 11, 2014 [2] Nikkei
continuing medical education-1, p.1, Jan. 2006 [3] http://chuo.kcho.jp/0riginal/clinicallabo/lab-news-backnumber7.html [ BWW Society Home Page ] © 2015 The Bibliotheque: World Wide Society |