title: The effect of a slack-pulling device in reducing operator physiological workload during log winching operations.
abstract: The authors conducted a comparative test to determine whether the introduction of a hydraulic slack puller allowed reducing the physiological workload of operators assigned to log winching tasks. The tests were conducted in northern Italy, on the mountains near Como. The study involved five volunteer subjects, considered representatives of the regional logging workforce. Physiological workload was determined by measuring the operators' heart rate upon completion of specific tasks. The slack puller improved the efficiency of downhill winching, since it allowed a single operator to pull out the cable on his own, without requiring the assistance of a colleague. However, introduction of the slack puller did not result in any reductions of operator physiological workload. The main stressor when working on a steep slope is moving up and down the slope: pulling a cable is only a secondary stressor. Any measures targeting secondary stressors are unlikely to produce dramatic reductions of operator workload.
authors.affiliation: a AFORA , University of the Sunshine Coast , Locked Bag 4, Maroochydore DC , QLD 4558 , Australia.
authors.forename: Raffaele
authors.initials: R
authors.lastname: Spinelli
authors.forename: Giovanna Ottaviani
authors.initials: GO
authors.lastname: Aalmo
authors.forename: Natascia
authors.initials: N
authors.lastname: Magagnotti
mesh_terms: D000328:Adult; D004867:Equipment Design; D006339:Heart Rate; D006801:Humans; D007221:Industry; D007558:Italy; D008297:Male; D008875:Middle Aged; D013647:Task Performance and Analysis; D016526:Workload
keywords: agriculture ergonomics; equipment design; industrial ergonomics; operator physiological workload