여름철 농민의 서열 부담 경감을 위한 냉각조끼의 성능 평가

Efficacy of Cooling Vests for Alleviating Heat Strain of Farm Workers in Summer

  • 최정화 (서울대학교 생활과학대학 의류학과) ;
  • 김명주 (서울대학교 생활과학대학 의류학과) ;
  • 이주영 (서울대학교 생활과학대학 의류학과)
  • Choi Jeong-Wha (Dept. of Clothing & Textiles, College of Human Ecology, Seoul National University) ;
  • Kim Myung-Ju (Dept. of Clothing & Textiles, College of Human Ecology, Seoul National University) ;
  • Lee Joo-Young (Dept. of Clothing & Textiles, College of Human Ecology, Seoul National University)
  • 발행 : 2005.08.01

초록

The purpose of this study was to evaluate the efficiency of cooling vests developed for farm workers harvesting red pepper in summer. The study was performed using the following two steps: 1) Climatic chamber test, 2) Field test. For the chamber test, a work environment was simulated as $33^{\circ}C$ and $65\%$RH, and the thermo-physiological and subjective responses were measured with and without cooling vests. Twelve young males participated as subjects. For the field test, three farmers participated while harvesting red pepper on the form, in summer. The measurements used were same as in the chamber test. Subjects were tested without any cooling vests, as a control. They were tested wearing vests with 2 frozen gel packs (CV2: Cooling area, $308cm^2$), and vests with 4 frozen gel packs (CV4: Sooting area, $616cm^2$). As a result of the chamber test, rectal temperature($T_{re}$) and mean skin temperature( $T_{sk}$) were lower in both CVs than in Control, and this tendency was statistically significant in CV4 (p<.05). Clothing microclimate temperature ($T_{clo}$) and total sweat rate (TSR) were significantly lower when wearing cooling vests (p<.05) Heart rate (HR) was also lower in wearing cooling vests than in Control, and the speed of recovery to the comfort level was faster when the subjects wore cooling vests. In addition, subjects felt 'less hot, less humid, and less uncomfortable' in both CVs than in Control. Field tests showed a similar tendency with the chamber tests. In particular, wearing the cooling vest was effective in restraining the raise of $T_{clo}$ on the back. It can be concluded that the cooling vest was effective in alleviating heat strain and discomfort in both the chamber test and the field test, despite the cooling area of the cooling vest being just $3.4\%$ of the body surface area ($616cm^2$).

키워드

참고문헌

  1. 기상청 기후통계. (2005). 기상청- 자료 검색일 2005,5. 30, 자료출처 http://www.kma.go.kr/kor/weather/climate/climate_06_01.jsp
  2. 김경수, 최정화. (2002) 소재에 따른 자외선, 복사열 차단력, 대한가정학회지, 40(10), 77-85
  3. 김화님, 황근미 (1991). 농촌 여성의 노동 실태 조사(44-10-08), 시험연구보고서. 농촌생활연구소
  4. 설향 (2001). 인체의 피부냉점 분포에 관한 연구. 서울대학교 생활과학대학원 박사학위 논문
  5. 최정화, 황경숙. (2001). 더운 환경에서의 냉각조끼의 착용효과에 관한 연구. 한국의류학회지, 25(1), 83-90
  6. 최정화, 황경숙. (2002). 냉각복 개발을 위한 효율적 냉각부위 규명에 관한 연구. 한국의류학회지, 26(6), 771-778
  7. Allan, J. R. (1988). The development of personal conditioning in military aviation. Ergonomics, 31(7), 1031-1040 https://doi.org/10.1080/00140138808966742
  8. Bain, B., & Vallerand, A. L. (1992). Limb blood flow while wearing aircrew chemical defense ensembles in the heat with and without auxiliary cooling. Aviation, space, and Environmental Medicine. 63(4), 267-272
  9. Bishop, P., Ray, P., & Reneau, P. (1995). A review of the ergonomics of work in the US military chemical protective clothing. Int J of Industrial Ergonomics, 15, 271-283 https://doi.org/10.1016/0169-8141(94)00041-Z
  10. Bomalaski, S. H., Chen, Y. T., & Constable, S. H. (1995). Continuous and intermittent personal microclimate. cooling'strategies. Aviat Space Environ Med, 66(8), 745-750
  11. Chen, Y. T., Constable, S. H., & Bomalaski, S. H. (1997). A light weight ambient air-cooling unit for use in hazardous environments. American Industrial Hygiene Association Journal, 58, 10-14 https://doi.org/10.1080/15428119791013017
  12. Choi, J. W., Kim M. J., & Lee J. Y. (2005). Ergonomic investigation of red pepper harvest workers in Korea: A pilot study for developing personal protective clothing. Applied Ergonormics. (In Press)
  13. Cohen, J. B., Allan, J. R., & Sowood, P. J. (1989). Effect of head or neck cooling used with a liquid-conditioned vest during simulated aircraft sorties. Aviation, space, and Environmental Medicine, 60, 315-320
  14. Constable, S. H., Bishop, P. A., Nunneley, S. A., & Chen, T. (1994). Intermittent microclimate cooling during rest increases work capacity and reduces heat stress. Ergonomics, 37(2), 277-285 https://doi.org/10.1080/00140139408963645
  15. Epstein, Y, Shapiro, Y, & Brill, S. (1986). Comparison between different auxiliary cooling devices in a severe hot/dry' climate. Ergonomics, 29(1), 41-48 https://doi.org/10.1080/00140138608968239
  16. Featherstone, G. (1988). Development and use of an air-cooled suit for work in nuclear reactor. Ergonomics, 31(7), 1025-1029 https://doi.org/10.1080/00140138808966741
  17. Frim, J. (1989). Head cooling is desirable but not essential for preventing heat strain in Pilots. Aviation, space, and Environmental Medicine, 60, 1056-1062
  18. Hanson, M. A. (1999). Development of draft British standard : the assessment of heat strain for workers wearing personal protective equipment. The Annals of Occupational Hygiene, 43(5), 309-319 https://doi.org/10.1016/S0003-4878(99)00053-8
  19. Holmer. (1992). The assessment of heat strain for workers wearing personal protective equipment. The Annals of Occupational Hygiene, 43(5), 309-319 https://doi.org/10.1016/S0003-4878(99)00053-8
  20. ISO 7726. (1995). Thermal environments-Instruments and methods for measuring physical quantities. International Organization for standardization, Switzerland
  21. ISO 9920. (1995). Ergonomics of the thermal environment-Estimation of the thermal insulation and evaporative resistance of a clothing ensemble. International Organization for standardization, Switzerland
  22. Joy, R. J., & Goldman, R. F. (1968). A method of relating physiology and military performance. A study of some effects of vapor barrier clothing in a hot climate. Military Medicine, 133(6), 458-470
  23. Minard, D., & Compan, L. (1963). Elevation of body temperature in disease. In J. D. Hardy (Eds), Temperature: Its Measurement and Control in Science and Industry (V 3, part 3, pp.253). New York: Reinhold
  24. Nag, P. K., Pradhan, C. K., Nag, A., Ashtekar, S. P., & Desai, H. (1998). Efficacy of water-cooled garment for auxiliary body cooling in heat. Ergonomics, 41(2), 177-187
  25. Nishihara, N., Tanabe, S., Hayama, H., & Komatsu, M. (2002). A cooling vest for working comfortably in a moderately hot environment. Journal of Physiological. Anthropology and Applied Human Science, 21(1), 75-82 https://doi.org/10.2114/jpa.21.75
  26. Nunneley, S. A. (1988). Design and evaluation of clothing for protection from heat stress: An overview. In I.B. Mekjavic et al. (Eds.), Environmental Ergonomics-Sustaining Human Performance in Harsh Environments (pp.88). Philadelphia, New York, London: Taylor & Francis
  27. Parsons, K.C. (1988). Protective clothing: heat exchange and physiological objectives. Ergonomics, 31(7), 991-1007 https://doi.org/10.1080/00140138808966738
  28. Pimental, N. A., Avellini, B. A., & Heaney, J. H. (1992). Ability of passive microclimate cooling vest to reduce thermal strain and increase tolerance time to work in the heat. Proceedings of the fifth international Conference on Environmental Ergonomics. 226
  29. Proctor, T.D.(1988). Conditioned clothing: the needs of industry and the wearer. Ergonomics, 31(7), 987-990 https://doi.org/10.1080/00140138808966737
  30. Richardson, G. Cohen, J.B., McPhate, D.C., & Hayes, P.A. (1988). A personal conditioning system based on a liquid-conditioned vest and a thermoelectric supply system. Ergonomics, 31(7), 1041-1047 https://doi.org/10.1080/00140138808966743
  31. Rodahl, K., & Guthe, T. (1988). Physiological limitations of human performance in hot environments, with particular reference to work in heat-exposed industry. In I.B. Mekjavic et al. (Eds.), Environmental Ergonomics-Sustaining Human Performance in Harsh Environments (pp.34, pp.39). Philadelphia, New York, London: Taylor & Francis
  32. Strydom. (1971). Wearer related performance standards for conditioned clothing. Ergonomics, 31(70), 1093-1101 https://doi.org/10.1080/00140138808966747
  33. Wialliams, C. G., Wyndham, C. H., & Morrison, J. F. (1967). Rate of loss of acclimatization in summer and winter. Journal of Applied Physiology, 22, p.21