Simplified appraisal method for fatigue on sitting for extended periods by using finger plethysmogram

E. Fujita, Y. Ogura, N. Ochiai, T. Kamei, K. Murata, Y. Ueno, Shigehiko Kaneko

研究成果: Article

1 引用 (Scopus)


For the purpose of quantifying and indicating the degree of fatigue as a result of sitting in an automobile seat for long periods of time, a method was developed by using a baseline oscillation and the amplitude of a finger plethysmogram. Between a finger plethysmogram and the degree of fatigue, there is about one hundred times difference in a fluctuation cycle. So, an idea was proposed to convert a finger plethysmogram into a gradient of comprehensive change to make fluctuation cycle scales easily comparable. The gradients of the square of the finger plethysmogram amplitude were converted into absolute values. Then, we drew a fatigue curve based on the results calculated at 18-second integrated values of the time series signals. This curve and the muscle fatigue curve from subjective judgment were in general accord. By using a finger plethysmogram featuring high sensitivity to the fatigue progress, differences in various subjects and seat performances could be found on this fatigue curve using only a 30-minute fatigue test. This new method has made it possible to greatly shorten the measurement time necessary to predict fatigue level by sensory evaluation.

ジャーナルJournal of Optoelectronics and Advanced Materials
出版物ステータスPublished - 2008 5 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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