Objective measurement of mental workload that affects productivity in moderately hot environment

Naoe Nishihara, Shin Ichi Tanabe, Masaoki Haneda, Satoshi Uchida, Gen Kawaguchi, Yuri Akiyama

Research output: Contribution to conferencePaper

Abstract

A subjective experiment was conducted to provide the evidences regarding the mechanism of the effect of indoor environmental quality on productivity by objective evaluation approach. The climate chamber was conditioned at the operative temperatures of 25.5, 28.5 or 31.5° C to examine the relationships among indoor thermal environment, performance and mental workload. The change rate of total hemoglobin concentration (ΔtotalHb) was measured on the left forehead by near infrared spectroscopy as an index of mental workload. Triple-digit multiplication task was assigned at two levels of working speed; maximum and normal pace, to manipulate mental workload. The Δtotal Hb at maximum pace was higher than that at normal pace at both 28.5° C and 31.5° C. The difference of ΔtotalHb between maximum and normal pace were significantly higher at 31.5° C than that at 25.5° C and tended to be higher at 28.5° C than that at 25.5° C. The results suggested that the mental workload level to maintain their task performance with maximum effort was higher in hotter environment.

Original languageEnglish
Publication statusPublished - 2009 Dec 1
Event9th International Healthy Buildings Conference and Exhibition, HB 2009 - Syracuse, NY, United States
Duration: 2009 Sep 132009 Sep 17

Conference

Conference9th International Healthy Buildings Conference and Exhibition, HB 2009
CountryUnited States
CitySyracuse, NY
Period09/9/1309/9/17

Keywords

  • Cerebral blood flow
  • Mental workload
  • Performance
  • Productivity
  • Thermal environment

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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  • Cite this

    Nishihara, N., Tanabe, S. I., Haneda, M., Uchida, S., Kawaguchi, G., & Akiyama, Y. (2009). Objective measurement of mental workload that affects productivity in moderately hot environment. Paper presented at 9th International Healthy Buildings Conference and Exhibition, HB 2009, Syracuse, NY, United States.