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(Yutaka Tochihara),(Tadakatsu Ohnaka) 한국의류산업학회 2000 한국의류산업학회지 Vol.2 No.5
To be able to work safely and efficiency, the Threshold Limit Values (TLV) for work in the heat are widely used. Since these TLV are only applicable to workers in regular clothing, TLV should be adjusted when applied to the asbestos removal workers who wear extra impermeable protective clothing. Although abbreviated guidelines for heat stress exposure have been proposed, literature advocating their use in the asbestos removal industry is limited. Therefore, we planed a survey to evaluate the workload of asbestos abatement workers in summer, and an experiment with climatic chambers to evaluate the effects of resting in a cool environment between work periods. From these studies, we got following conclusions. There is a high risk of suffering from heat illness by asbestos abatement work in summer in Japan. It is proposed to create a cool room inside the workplace of asbestos abatement work to reduce thermal stress.
손수영,Satoshi Muraki,Yutaka Tochihara 한국의류학회 2022 Fashion and Textiles Vol.9 No.1
This study aimed to ascertain the appropriate test methods for the investigation of the efect of personal protective equipment on mobility of frefghters. Nine male volunteers performed a physical performance test (crawl, obstacle course, side-to-side jumps, heavy-object drag, and step-ups), functional balance test (functional reach, timed up and go, and wooden plank time), range of motion test, and subjective evaluation under four clothing conditions with diferent weights and combinations of personal protective equipment. The results showed that physical performance, functional balance ability, and joint angles signifcantly declined with increased weight of personal protective equipment. On subjective evaluation, wearing heavy personal protective equipment increased perceived exertion and discomfort on movement. Our results proved that some of our test methods, including the obstacle course, side-toside jumps, functional reach, timed up and go, range of motion test, and subjective evaluation, can be used to examine the mobility of personal protective equipment wearers. The fndings of this study provide an efective guide for researchers and frefghters regarding the evaluation of mobility with personal protective equipment, as well as for manufacturers in the development of enhanced, comfortable personal protective equipment.
Influence of the Bathing Starting Time on Sleep in Winter
( Eun Jung Sung ),( Yutaka Tochihara ) 한국감성과학회 2000 춘계학술대회 Vol.2000 No.-
The effects of the timing of daily bathing on sleep in winter were studied. Eight healthy male subjects were assigned to three sleep conditions: bathing just before sleeping (Condition J), bathing 2 h before sleeping (Condition T) and no bathing before sleeping (Control). We can found that slow wave sleep and REM sleep were increased, and sleep onset latency and wake after sleep onset were shortened in Condition T compared with Condition 1. Rectal and mean skin temperatures in both bathing conditions were the same levels after the first half of sleep. Furthermore, subjective sleep sensation was the highest value in Condition T. These results suggest that bathing done before going to bed in winter was good for sleep; moreover, bathing 2 h before going to bed was more effective than bathing immediately before going to bed.
(Shigeko Shoyama),(Jung Sook Kim),(Yutaka Tochihara) 한국의류산업학회 2001 한국의류산업학회지 Vol.3 No.5
The present study focused on the color of clothing for elderly Korean women, from the viewpoint of helping elderly people live more interesting lives with regard to their clothing, considering that the Korean society will become elderly-oriented in the near future. We took photographs of the elderly served as the models, displayed them on a computer screen , and produced 75 colors of the clothing in the elderly using computer graphics. The 75 colors were evaluated by 2 groups, one of elderly Korean woman group and a group of female students. We compared the ideal colors for and the colors actually worn by elderly people. The evaluation of the clothing colors for elderly women differed between the elderly woman group and the female student group. Analysis of images of the clothing colors selected by the elderly women showed that they attach importance to elegance when selecting clothing colors and have a strong desire to become active. The images held by female students concerning ideal clothing colors for elderly women closely pertained to commonness and inactivity
Wakabayashi, Hitoshi,Wijayanto, Titis,Lee, Joo-Young,Hashiguchi, Nobuko,Saat, Mohamed,Tochihara, Yutaka BioMed Central 2014 Journal of Physiological Anthropology Vol.33 No.1
<P><B>Background</B></P><P>This study investigated the effect of hydration differences on body fluid and temperature regulation between tropical and temperate indigenes exercising in the heat.</P><P><B>Methods</B></P><P>Ten Japanese and ten Malaysian males with matched physical characteristics (height, body weight, and peak oxygen consumption) participated in this study. Participants performed exercise for 60 min at 55% peak oxygen uptake followed by a 30-min recovery at 32°C and 70% relative air humidity with hydration (4 times each, 3 mL per kg body weight, 37°C) or without hydration. Rectal temperature, skin temperature, heart rate, skin blood flow, and blood pressure were measured continuously. The percentage of body weight loss and total sweat loss were calculated from body weight measurements. The percentage change in plasma volume was estimated from hemoglobin concentration and hematocrit.</P><P><B>Results</B></P><P>Malaysian participants had a significantly lower rectal temperature, a smaller reduction in plasma volume, and a lower heart rate in the hydrated condition than in the non-hydrated condition at the end of exercise (<I>P</I> <0.05), whereas Japanese participants showed no difference between the two hydration conditions. Hydration induced a greater total sweat loss in both groups (<I>P</I> <0.05), and the percentage of body weight loss in hydrated Malaysians was significantly less than in hydrated Japanese (<I>P</I> <0.05). A significant interaction between groups and hydration conditions was observed for the percentage of mean cutaneous vascular conductance during exercise relative to baseline (<I>P</I> <0.05).</P><P><B>Conclusions</B></P><P>The smaller reduction in plasma volume and percentage body weight loss in hydrated Malaysians indicated an advantage in body fluid regulation. This may enable Malaysians to reserve more blood for circulation and heat dissipation and thereby maintain lower rectal temperatures in a hydrated condition.</P>
LEE, Joo-Young,PARK, Joonhee,PARK, Huiju,COCA, Aitor,KIM, Jung-Hyun,TAYLOR, Nigel A.S.,SON, Su-Young,TOCHIHARA, Yutaka National Institute of Industrial Health 2015 Industrial health Vol.53 No.5
<P>The purpose of this study was to investigate smart features required for the next generation of personal protective equipment (PPE) for firefighters in Australia, Korea, Japan, and the USA. Questionnaire responses were obtained from 167 Australian, 351 Japanese, 413 Korean, and 763 U.S. firefighters (1,611 males and 61 females). Preferences concerning smart features varied among countries, with 27% of Korean and 30% of U.S. firefighters identifying ‘a location monitoring system’ as the most important element. On the other hand, 43% of Japanese firefighters preferred ‘an automatic body cooling system’ while 21% of the Australian firefighters selected equally ‘an automatic body cooling system’ and ‘a wireless communication system’. When asked to rank these elements in descending priority, responses across these countries were very similar with the following items ranked highest: ‘a location monitoring system’, ‘an automatic body cooling system’, ‘a wireless communication system’, and ‘a vision support system’. The least preferred elements were ‘an automatic body warming system’ and ‘a voice recording system’. No preferential relationship was apparent for age, work experience, gender or anthropometric characteristics. These results have implications for the development of the next generation of PPE along with the international standardisation of the smart PPE.</P>