1986 Fiscal Year Final Research Report Summary
Estimation of Body Density with a Highky Accurate Human Body Volumometer and its Medical Application
| Project/Area Number |
59870021
|
|---|
| Research Category |
Grant-in-Aid for Developmental Scientific Research
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Hygiene
|
|---|
| Research Institution | Nihon University |
|---|
Principal Investigator |
ITO Masao Department of Hygiene, School of Medicine, Nippon University, 医学部, 講師 (40059887)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
YAJIMA Kazuyoshi Department of Hygiene, School of Medicine, Nippon University, 医学部, 教授 (40010029)
MARU Ruriko Department of Hygiene, School of Medicine, Nippon University, 医学部, 講師 (20059091)
NISHIKAWA Sinhachi Department of Hygiene, School of Medicine, Nippon University, 医学部, 講師 (10058555)
SHIRAISHI Nobuhisa Department of Hygiene, School of Medicine, Nippon University, 医学部, 講師 (90058446)
|
|---|
| Project Period (FY) |
1987 – 1988
|
| Keywords | Obesity / Body Volume / Body Density / ボイル・シャルルの法則 |
|---|
| Research Abstract |
In the present wxperiment, I contrived a simple and accurate human body volumometer based on air replacement and studied the possibility of its practical use and drawbacks.
This is to report the summary of our study.
The principle of the air replacement volumometer : The subject is placed in an airtight chamber and the included air is compressed by the water spouted in. The body volume is calculated from the change in the pressure according to Boyle-Charles'low. Fig.1 shows the schema and estimation formula of this method. The measurement sensitivity can be obtained as the change in the equilibrium pressure caused by the unit volum change in the subject's volume. Thus, the higher the secondary equilibrium pressure, or the smaller the remaining air volume within the container, the higher the measurement sensitivity.
Measurement ; The important points in executing the measurement are to maintain airtightness of the chamber and to prevent its deformation. The rate of compressing and depressing the air in the chamber must be carefully controled so that it conforms to the regulations for prevention of high pressure disturbances.
Problems : The formula given in Fig.1 includes corrections for changes in temperature and humidity. No correction is necessary for humidity as long as the relative humidity does not amount to 100%. Yet there is always a possibility of changes in temperature and humidity from compression, body temperature, exhalation and perspiration. When the condition of the air within the chamber becomes uneven, therefore, this cannot be accurately sensed by the present device and a seriously erroneous measurement may result.
An investigation is under way to use a regression formula obtained from the measurement on an object of known volume in order to improve the accuracy of measurement.
|
