中國醫藥大學機構典藏 China Medical University Repository, Taiwan:Item 310903500/716
English  |  正體中文  |  简体中文  |  Items with full text/Total items : 29490/55136 (53%)
Visitors : 1520350      Online Users : 332
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
    •  Adv. Search
    Home ‧ Login ‧ Upload ‧ Help ‧ About ‧ Administer Goto mobile version


    Please use this identifier to cite or link to this item: http://ir.cmu.edu.tw/ir/handle/310903500/716


    Title: 非動力密閉淨氣式濾毒罐面罩與N95口罩在濕熱環境下之生理負荷與主觀不適之影響評估;Assessment of the physiological loads and subjective discomforts for non-powered tight-fitting air-purifying respirator with canister and N95 facemask under thermo and humid condition
    Authors: 宣俞宏;Yo-Hung Hsuan
    Contributors: 中國醫藥大學：職業安全衛生學系
    Keywords: 呼吸防護具;N95口罩;熱環境;生理負荷;Respirator;N95 face mask;Thermo environment;Physiological load
    Date: 2008-07-10
    Issue Date: 2009-08-12 15:21:00 (UTC+8)
    Abstract: 本研究針對一般工業最常用之全面式面罩搭配濾毒罐與N95口罩，在濕熱環境下對使用者造成的生理負荷與主觀不適進行評估，分兩個實驗進行，實驗一配戴全面式面罩進行實驗，並以無過濾功能的四分面罩作為對照組，實驗二則配戴無閥和有閥之折疊式船型N95口罩進行實驗。每個實驗之受試者皆為16位男性大專生，自變項皆為兩種呼吸防護具、工作負荷（45W輕度工作和85W中度工作）、環境溫度（25℃和35℃）和環境相對濕度（50%和70%），應變項主要包括工作時心跳、呼吸頻率、吸/吐氣壓力、吸/吐氣時間、潮氣容積、分通氣量、耗氧量、面罩內溫度以及評估主觀不適程度的問卷。

    研究結果發現在相同的面罩、工作負荷和濕度下，溫度上升皆會顯著增加工作時心跳、工作心跳、呼吸頻率、吸氣壓力、面罩內溫度、潮氣容積（僅實驗一）、主觀不適程度，吸氣時間則顯著降低，其中配戴全面式面罩的工作時心跳在輕度工作時增加了9-10 bpm、中度12-15 bpm，配戴無閥N95口罩時為4-6和7-8 bpm，而配戴有閥N95口罩則為7-8和9 bpm；在相同的面罩、工作負荷和溫度下，濕度上升會顯著增加耗氧量、工作心跳、呼吸頻率（實驗一）、吸氣壓力和分通氣量（實驗二）和主觀不適程度。

    生理指標與主觀不適相關性比較，實驗一有顯著相關的為工作心跳、耗氧量，實驗二為面罩內溫度、呼吸頻率和吸氣時間。若將溫濕度合併成WBGT值分析，隨著WBGT的上升，工作時心跳也會顯著增加，其中執行中度工作時心跳增加的程度較輕度時高。建議在濕熱環境下配戴呼吸防護具工作應調整適當的工作-休息時間。

    This study aimed to evaluate the physiological workloads and subjective discomforts for the most frequently employed full-facepiece respirators with canister and N95 facemasks under thermo environment. Two seperate experiments were conducted. The first experiment evaluated the full-facepiece respirator and using a low respiratory resistance quarter-face mask as the control condition. The second experiment assessed two N95 facemasks with one equipped with valve and the other one without valve. Sixteen physically fit male university students participated in each experiment. The evaluated independent variables were identical in the two experiments including respirator type (RT), workload (WL; light work 45W and moderate work 85W), environmental tepmerature (ET; 25℃ and 35℃) and relative humidity (RH; 50% and 70%). The main mesured dependent variables for both experiments included heart rate at working (HRwork), work pulse (WP), breathing frequence (BF), peak inspiratory and expiratory pressure (PIP/PEP), inspiratory and expiratory time (Ti, Te), tidal volume (VT), minute ventilation (VE), oxygen consumption (VO2), temperature in mask (Tm) and subjective rate of perceptual exertion (RPE).

    Results indicated that working in higher ET imposed significant physiological and psychological strain added to that caused by significantly increased HRwork, WP, BF, PIP, Tm, VT (first experiment only), and RPE and decreased Te for same RT, WL and RH. Compared with work at ET = 25℃, work at ET=35℃ and equipped with RF, the HRwork significantly increased 9 to 10 bpm for light WL and 12 to 15 bpm for moderate WL. As for RNV, working at ET = 35℃, the HRwork were reported significantly increased 4 to 6 bpm for light WL and 7 to 8 bpm for moderate WL compared with work at ET = 25℃. Regarding RWV, the increased HRwork were 7 to 8 bmp for light WL and 9 bmp for moderate WL when ET shifted from 25℃ to 35℃. Increased RH were reported with significantly increased VO2, HRwork, WP, BF (experiment 1 only), PIP (experiment 2 only), VE (experiment 2 only) and RPE for same WL, ET, and RT. RPE were found significantly correlated with HRwork, WP, and VO2 for the first experiment and with Tm, BF, and Ti for the second experiment.

    When combined the two ET conditions and two RH conditions into 4 corresponded wet bulb globe temperature index (WBGT) levels, it was found that the HRwork significantly increased with higher WBGT. The degree of increased HRwork was significantly higher for moderate WL compared with light WL. It is suggested that the work-rest ratio should be decreased when wearing respirator under thermo work environment.
    Appears in Collections:[Department and Graduate of Occupational Safety and Health] Theses & dissertations

    Files in This Item:

    File Description SizeFormat
    cmu-97-9572005-1.pdf4223KbAdobe PDF315View/Open
    index.html0KbHTML16View/Open


    All items in CMUR are protected by copyright, with all rights reserved.

     

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback