Abstract
Objectives
This study was performed to determine the effects of decreasing ambient temperature on peripheral blood flow and body temperature of males and females in a thermal neutral zone for references to the thermal standard of office workers.
Methods
Peripheral blood flows of the hand and feet, and body temperatures and so on of male and female subjects were measured in a climatic chamber. Air temperature was maintained at 28.5°C at the beginning. After this, air temperature was decreased linearly to 21.0°C over a period of 60 minutes. Finally, air temperature was maintained at 21.0°C.
Results
Blood flows and skin temperatures of male and female subjects became similar or showed no significant difference at beginning and the end of the experiment. Skin blood flow of the hand and skin temperatures of the hand and fingers decreased, and these values in females were lower than in males, when air temperature was decreased linearly in a thermal neutral zone. However, there were no remarkable differences between males and females in sublingual and mean skin temperatures during the experiment.
Conclusion
Minimum air temperature at the thermal standard for offices in Japan is 17°C, which may be too low to be comfortable or neutral. Even in a neutral thermal condition, it is better that office workers are provided some protection such as a blanket or clothing, to protect peripheral body parts from cooling in winter, as there are individual differences in physiological thermal reactions.
Key words: blood flow, skin temperature, sex difference, thermal environment, thermal standard
References
- (1).Building Management Education Center. Maintenance of Building Sanitation—Law for Maintenance of Sanitation in Buildings—, 1999.
- (2).The Japan Society for Occupational Health. Recommendation of Occupational Exposure Limits. J. Occupational Health 2003; 45: 254–269. [PubMed]
- (3).Hardy JD, Du Bois EF. Differences between men and women in their responses to heat and cold. Proceeding National Academic Science 1940; 26: 389–398. [DOI] [PMC free article] [PubMed]
- (4).Fanger PO. Thermal Comfort. New York: McGraw-Hill, 1970.
- (5).Evans E, Rendell M, Bartek J, Connor S, Bamisedun O, Dovgan D, Giitter M. Thermally-induced cutaneous vasodilatation in aging. J. Gerontology Med. Science 1993; 48: M53-M57. [DOI] [PubMed]
- (6).Fox RH, Goldsmith R, Kidd DJ, Lewis HE. Blood flow and other thermoregulatory changes with acclimatization to heat. J. Physiology 1963: 166: 548–562. [DOI] [PMC free article] [PubMed]
- (7).Tochihara Y, Ohnaka T, Yamazaki S, Tanaka M, Yosida K, Ogawa S, Igawa S, Ito Y, Watanabe K. Effects of air humidity on physiological responses of men and women during prolonged exercise. DESANTO Sport science 1985; 6: 234–239.
- (8).Rendell MS, Giitter M, Bamisedun O, Davenport K, Schultz R. The laser Doppler analysis of posturally induced changes in skin blood flow at elevated temperatures. Clinical Physiology 1992; 12: 241–252. [DOI] [PubMed]
- (9).Rooke GA, Savage MV, Brengelmann GL. Maximal skin blood flow is decreased in elderly men. J. Appl. Physiology 1994; 77: 11–14. [DOI] [PubMed]
- (10).Charkoudian N, Johnson JM. Altered reflex control of cutaneous circulation by female sex steroids is independent of prostaglandin. American J. Physiology 1999; 276: H1634-H1640. [DOI] [PubMed]
- (11).Astrand P-O, Kaare Rodahl. Textbook of work Physiology. New York: McGraw-Hill, 1986.
- (12).Johnson JM, Pergola PE, Frank KL, Kellogg Jr. DL, Crandall CG. Skin of the dorsal aspect of human hands and fingers possesses an active vasodilator system. J. Appl. Physiology 1995; 78: 948–954. [DOI] [PubMed]
- (13).Sakurada S, Shido O, Yamamoto K, Sugimoto N, Kobayahi T, Nagasaka T. Effect of digital nerve blockade on heat-induced vasoconstriction in the human finger. J. Appl. Physiology 1995; 78: 746–749. [DOI] [PubMed]
- (14).Tanaka M, Desruelle A-V, Sari H, Candas V, Tanaka K, Maeda T, Kobayashi T. Effects of thermal changes on peripheral blood flow and skin temperature in males and females. In: Sato, M editor. Current topics in physiological anthropology. Zagreb; Croatian Anthropological Society, 2000: 83–90.
- (15).Morimoto T, Slabochova Z, Naman PK, Sargent II F. Sex differences in physiological reactions to thermal stress. J. Appl. Physiology 1967; 22: 526–532. [DOI] [PubMed]
- (16).Carlson LD. In: Hsieh A.C.L. editor. Cold, The physiology of human survival. London and New York: Academic Press, 1965, 15–51.
- (17).Tanaka M. Experimental studies on human reaction to cold —with reference to differences between males and females.— Bulletin Tokyo Medical Dental University 1972; 19: 1–18. [PubMed]
- (18).National Aeronautics and space administration. Bioastronautics Data Book NASA sp-3006. 1964.
- (19).Helmut OS, Giancarlo P, Jessica C, Kristin C, Annette H, Ginger H, Alain DB. Type II diabetes abrogates sex differences in endothelial function in premenopausal women. Circulation 2000; 101: 2040–2046. [DOI] [PubMed]
- (20).Nagashima Y, Yada Y, Suzuki T, Sasaki A. Evaluation of the use of an integration type laser-doppler flow meter with a temperature-loading instrument for measuring skin blood flow in elderly subjects during cooling load: comparison with younger subjects. Int. J. Biometeorol 2003; 47: 139–147. [DOI] [PubMed]