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Agyekum, B, Kissi, E, Yamoah Agyemang, D and Badu, E (2018) Examining barriers for the utilization of non-traditional cost estimating models in developing countries. Journal of Engineering, Design and Technology, 16(06), 814–27.

Aouad, R and Amara, I (2018) Influence of the cutting condition on the wear and the surface roughness in the steel AISI 4140 with mixed ceramic and diamond tool. Journal of Engineering, Design and Technology, 16(06), 828–36.

Chen, Y and Yang, Z (2018) Validity and reliability of rating scales for subjective breathing resistance of wearing respirators. Journal of Engineering, Design and Technology, 16(06), 837–49.

  • Type: Journal Article
  • Keywords: Reliability; Validity; Comfort; Human factor engineering; Respirators; Subjective breathing resistances;
  • ISBN/ISSN: 1726-0531
  • URL: https://doi.org/10.1108/JEDT-05-2018-0082
  • Abstract:
    Investigating the subjective breathing resistance of wearing respirators requires a valid and reliable technique to measure breathing resistance. The purpose of this study is to test the validity and reliability of several rating scales and select the best for investigation of breathing resistance. Design/methodology/approach The authors designed three scales, that is, BRX scale, CP-100 scale and RVAS scale, and 30 subjects were separated into three groups, each group with a different scale. They sat for 5 min and walked for 5 min while wearing three models of respirators. After each trial, subjects were asked to complete subjective ratings of breathing resistance. Reliability was examined by the coefficient of Cronbach’s α, and validity was examined through content validity, discriminant validity and criterion validity. Generally, subjects were capable of reporting their sensation of breathing resistance by using the rating scale technique. However, the accuracy of rating strongly depended upon the properties of the scale. Findings The CP-100 scale was found to be highly reliable and most valid for rating subjective breath resistance. The validated CP-100 scale is very sensitive and accurate. Originality/value This is the first paper to select the best subjective scale for investigation of breathing resistance of respirators. The CP-100 scale will find wide applications in subjective breathing resistance evaluation for the use of respirators in industrial benchmarking activities. It will introduce the human factor engineering into the respirator manufacturing to improve the comfort of respirators.

De Silva, N, Rathnayake, U and Kulasekera, K (2018) Under-reporting of construction accidents in Sri Lanka. Journal of Engineering, Design and Technology, 16(06), 850–68.

Kulkarni, S, Edwards, D J, Parn, E A, Chapman, C, Aigbavboa, C O and Cornish, R (2018) Evaluation of vehicle lightweighting to reduce greenhouse gas emissions with focus on magnesium substitution. Journal of Engineering, Design and Technology, 16(06), 869–88.

Nawfal, S and Ali, F (2018) The acceleration of 3D graphics transformations based on CUDA. Journal of Engineering, Design and Technology, 16(06), 925–37.

Ndokwana, A and Fore, S (2018) Economic assessment of bioethanol production from maize in South Africa. Journal of Engineering, Design and Technology, 16(06), 973–94.

Owusu-Manu, D, Edwards, D J, Kukah, A, Parn, E A, El-Gohary, H and Hosseini, M R (2018) An empirical examination of moral hazards and adverse selection on PPP projects. Journal of Engineering, Design and Technology, 16(06), 910–24.

Romanello, G (2018) Stability analysis of mobile cranes and determination of outriggers loading. Journal of Engineering, Design and Technology, 16(06), 938–58.

Senaratne, S, Mirza, O, Lambrousis, G and Fernandez-Soncini, A (2018) Structural applicability of steel fibre-recycled aggregate concrete in construction. Journal of Engineering, Design and Technology, 16(06), 959–72.

Witmer, A (2018) Contextual engineering assessment using an influence-identification tool. Journal of Engineering, Design and Technology, 16(06), 889–909.