著者

土井 正裕 並木 幸久 設楽 佳世 甲斐 昌一

出版者

Japanese Society for Medical and Biological Engineering

雑誌

生体医工学 : 日本エム・イー学会誌 = Transactions of the Japanese Society for Medical and Biological Engineering : BME (ISSN:1347443X)

巻号頁・発行日

vol.47, no.6, pp.477-483, 2009-12-10

---

In order to validate Total Body Score (TBS) as an index for comprehensive evaluation of human body, we examined relationships between TBS and parameters which are correlated with metabolic syndrome (MS). Receiver operating characteristic (ROC) curve analysis showed that TBS is a useful index for MS screening. TBS had statistically significant correlations with systolic blood pressure, diastolic blood pressure, neutral fat, HDL cholesterol, visceral fat, and subcutaneous fat. The subjects who had low TBS showed statistically high probability to have one or more MS risk factors. The result suggested that assessment with cross-sectional biomedical data is useful for screening of MS risks.

著者

蘇日 塔拉図 外山 寛 小杉 剛 木竜 徹 林 豊彦 飯島 淳彦 前田 義信 山崎 健

出版者

一般社団法人 日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 = Transactions of the Japanese Society for Medical and Biological Engineering : BME (ISSN:1347443X)

巻号頁・発行日

vol.48, no.1, pp.98-105, 2010-02-10

参考文献数

17

被引用文献数

2

---

Visually induced motion sickness is one of the detrimental effects of video images on human psychosomatic state. Several studies for alleviating this effect have been cumulated in recent years. One of the studies reported that people with high heart rate tended to be immune to the motion sickness. This fact motivated us to assume that the increase of subjects' heart rate through physical exercise before video watching could prevent them from the motion sickness. Then we investigated the effects of video exposure with such pre-exercise on the motion sickness. First we recorded psychosomatic state of 23 volunteers using the simulator sickness questionnaire (SSQ) before and after watching extremely unpleasant video images of a mountain-bike ride capable of visually inducing motion sickness. Then we classified them into nausea and non-nausea groups, based on SSQ evaluation. Subjects' heart rate in nausea group increased gradually during video exposure, while that in non-nausea group was nearly constant. By imposing a 5-minute pre-exercise on 12 subjects in nausea group before video exposure, 10 subjects became immune to the motion sickness, demonstrating that the pre-exercise would be efficient for alleviating the motion sickness. In addition subjects' heart rate in nausea group remained at a higher level during video exposure than at rest, whereas it returned to the rest level immediately after the pre-excise without video exposure.

著者

水野 松本 由子 田中 康仁 林 拓世 岡本 永佳 西村 治彦 稲田 紘

出版者

一般社団法人 日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 = Transactions of the Japanese Society for Medical and Biological Engineering : BME (ISSN:1347443X)

巻号頁・発行日

vol.48, no.1, pp.11-24, 2010-02-10

参考文献数

32

被引用文献数

2

---

The aim of this research was to assess the physiological signals which were relevant working efficiency under mental workload. Eleven healthy subjects were examined. In the first step, their mood status and stress level were evaluated with questionnaire methods:“Profile of Mood States (POMS)” and “Stress Self Rating Scale (SSRS)”, respectively. In the second step, electroencephalography (EEG) and photoplethysmography under the mental workload tasks in four auditory stimuli (silent circumstance, white noise, classical music, and up-tempo music) were measured. The mental workload tasks consisted of two parts:performing Uchida-Kraepelin test (calculating task:CAL) on PC monitor in two minutes and fixating on a crosshair image (after CAL) in two minutes. A procedure of the mental workload task in each auditory stimulus was repeated three times. EEG data were analyzed using a discrete Fourier transform to obtain power spectral density (PSD) in theta, alpha, and beta bands. Pulse waves from photoplethysmography were analyzed for estimating the pulse wave amplitude (PWA) and length (PWL). PSDs of theta band in silent circumstance and classical music under and after CALs, alpha band in classical music under and after CALs, and beta band in up-tempo music under CAL on most or all areas were significantly larger than those in the other auditory stimuli. The results of photoplethysmography analysis showed that changes of PWA and PWL in silent circumstance and classical music were more stable than those in the other auditory stimuli. It was suggested that the classical music would not only affect brain activity under the mental workload and augment the efficiency of it, but also facilitate recovery of the physiological conditions from the stressful situations. These events from the physiological point of view showed that working environments could be considered to avoid adding stress on the brain function and autonomic nervous system during and even after the tasks.

著者

長岡 智明 櫻井 清子 国枝 悦夫 渡辺 聡一 本間 寛之 鈴木 保 河合 光正 酒本 勝之 小川 幸次 此川 公紀 久保田 勝巳 金 鳳洙 多氣 昌生 山中 幸雄 渡辺 敏

出版者

日本エム・イー学会

雑誌

生体医工学 : 日本エム・イー学会誌 = Transactions of the Japanese Society for Medical and Biological Engineering : BME (ISSN:1347443X)

巻号頁・発行日

vol.40, no.4, pp.239-246, 2002-12-10

被引用文献数

42 17

著者

田中 志信 本井 幸介 野川 雅道 山越 健弘 山越 憲一

出版者

日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 = Transactions of the Japanese Society for Medical and Biological Engineering : BME (ISSN:1347443X)

巻号頁・発行日

vol.44, no.3, pp.467-474, 2006-09-10

被引用文献数

3

---

The daily monitoring of health conditions at home is a very important subject not only as an effective scheme for the early diagnosis and treatment of cardiovascular and other diseases, but also for the prevention and control of such diseases. From this point of view, we have been developing a fully automated "non-conscious" monitoring system for home healthcare. In this paper, we describe the structural details of a newly developed blood pressure (BP) measurement system built into a toilet seat and some results obtained using the system. The principle used for BP measurement was the volume-oscillometric method. A reflectance-type photop-lethysmographic sensor was installed in an appropriate position on the toilet seat, and it was automatically lifted and lowered using a newly designed helicoid-type actuator. Systolic (SBP) and mean BP (MBP) were obtained using the arterial volume pulsation signal obtained by the sensor. In order to evaluate the accuracy of the BP measurements, simultaneous measurements were carried out using two types of commercially available BP monitors (upper arm and wrist). Simultaneous measurement using an "invasive technique" via catheterization to the right brachial artery was also conducted. From the results obtained (bias [s.d.] for SBP; Upper arm: -1.20 [7.90] mmHg, Wrist: 0.44 [7.28] mmHg, Invasive: -0.41 [4.91] mmHg, bias [s.d.] for MBP; Upper arm: 4.40 [6.91] mmHg, Wrist: 5.07 [8.04] mmHg, Invasive: 3.68 [5.69] mmHg), reasonable accuracy of the present system was clearly demonstrated. This system, which requires no cumbersome procedures for BP measurement such as cuff setting, proper positioning of measuring site and so on, appears to be a useful means for long-term home healthcare monitoring.