The influence of “biorhythm” on the incidence of injuries among forest workers

  • Otakar Sláma


The paper investigates effects of the three basic cyclic rhythms including a 23-day physical cycle, a 28-day emotional cycle and a 33-day intellectual cycle on the incidence of injuries among 322 forest workers, using the mathematical system of Khalil and Kurucz (1977).

Results of the present work based on the examination of samples representing another sphere of human activity in two out of five cases studied support the conclusions of the above mentioned authors. In the remaining three cases the application of the method neither confirmed nor disproved the statement that biorhythms do not affect the incidence of injuries.

Key words

Ergonomy Forestry Biorythms Statistics 


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  1. Khalil TM, Kurucz CN (1977) The influence of “biorhythm” on accident occurence and performance. Ergonomics 20: 389–398PubMedGoogle Scholar
  2. Thommen G (1964) Is this your day? Crown Publ Inc, New YorkGoogle Scholar
  3. Willis HR (1972) Biorhythm and its relationship to human error. Proceedings of the 16th Annual Meeting of the Human Factors Society, Beverly Hills, California, pp 274–282Google Scholar

Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • Otakar Sláma
    • 1
  1. 1.Faculty of ForestryUniversity of AgricultureBrnoCzechoslovakia

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