- 著者
- 佐藤 厚子 李 相潤 畠山 愛子 石田 和雄 面澤 和子 永富 良一
- 出版者
- 一般社団法人日本体力医学会
- 雑誌
- 体力科学 (ISSN:0039906X)
- 巻号頁・発行日
- vol.60, no.5, pp.483-492, 2011 (Released:2011-11-15)
- 参考文献数
- 47
- 被引用文献数
- 1
Measuring the bioelectrical impedance (BI) is a simple and non-invasive method for estimating body fat or muscle mass. However, body impedance is affected by variations in the distribution of body fluid without reference to actual body fat or muscle mass. Twenty healthy college students (10 males, 10 females; mean age 21.0±2.3 years) participated in the study. Their mean body mass index was 20.7±2.6 kg/m2. Bipolar electrodes were place on all extremities, and InBody 3.0TM (Biospace Co., Ltd., Seoul, Korea) was used to measure bioelectrical impedance. Each subject remained in a supine position on a comfortable bed between 07:00 and 12:00 except for excretion and measurement of BI. BI was measured hourly using frequencies ranging from 5 to 500 kHz. The subjects refrained from eating, drinking and exercising between 07:00 and 12:00 during the first week of measurements, and drank 6.7 ml/kg of water at 07:00 after the first measurement of BI during a subsequent week of measurements. Bioelectrical impedance was higher in female subjects in all body segments and conditions (p<0.01). BI in the right arm was lower than that in the left in all participants (p<0.001). The difference between the highest and lowest BI among six measurements was largest in the upper extremities, followed by the lower extremities. Differences in the coefficient of variation CV values of the right arm of both females and males at 50, 250, and 500 kHz during fasting were significantly smaller than after drinking water. Hydration had no effect on the differences in the CV values of the body trunk and lower extremity BI or BI at lower frequencies. BI indicates the possibility of remarkable decrease in variation in the upper extremity BI at higher frequencies by taking 6.7 ml/kg of water at get up and enables minimizing the estimate error of body fat percentage.
- 著者
- 石田 和雄 小林 信之
- 出版者
- 一般社団法人日本機械学会
- 雑誌
- 日本機械学會論文集. A編 (ISSN:03875008)
- 巻号頁・発行日
- vol.50, no.453, pp.1042-1048, 1984-05-25
- 被引用文献数
- 2 1
An effective method for calculating the nonlinear-rocking response of ground-supported unanchored cylindrical tanks to earthquakes was developed. In this method, tank wall and liquid content are replaced with a mass-spring system, and the nonlinearity associated with the partial uplift of bottom plates due to overturning moments is considered as the rotational spring of bi-linear type which is determined by a static uplift analysis of tank bottom. The reliability of the dynamic analysis was illustrated by computing resonance frequencies, response accelerations and rotation angles of tank models and by comparing them with the results of vibration tests. A seismic deign procedure for nonlinear rocking of tanks is proposed, in which the uplift height of bottom plates is calculated by dynamic rocking analysis and the corresponding radial stress of them is obtained by static analysis. And a rocking analysis of a full-sized tank was tried, too.
- 著者
- 小林 信之 石田 和雄
- 出版者
- 一般社団法人日本機械学会
- 雑誌
- 日本機械学會論文集. A編 (ISSN:03875008)
- 巻号頁・発行日
- vol.50, no.451, pp.514-519, 1984-03-25
- 被引用文献数
- 1
When an earthquake hitting, the part of the bottom plate of the unanchored cylindrical tank will be lifted up from the foundation so that no resistance mechanism is existed against the uplift force caused by the overturning moment. The high stresses will be yielded in the bottom plate and the shell plate. This report concerns those problems. The calculation model was made in order to obtain the uplift resistance force, the uplift height, the reaction force from the foundation and the uplift region. In this model, the uplift region was considered as crescent shape, and the elasto-plastic, large deformation effect and the contact problem of the bottom plate was considered. From the comparison between this calculation model and the static tilt test of a thin bottom plate model tank, the calculation result was good agreement with the test.