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    The use of heart rate indices and subjective questionnaires in the determination of fatigue in motor-manual tree felling and delimbing operations in New Zealand exotic plantation forests : a thesis presented in partial fulfilment of the requirements for the degree of Master of Business Studies in Ergonomics at Massey University
    (Massey University, 1996) Kirk, Patrick Michael
    This study assessed the use of heart rate indices and subjective questionnaires in the determination of fatigue in motor-manual tree felling operations in New Zealand exotic plantation forests. The research design consisted of a causal study utilising an amalgamation of both observational and ex post facto data collection techniques employing a cross sectional case study approach within a field study research environment. Findings from the research indicate that motor-manual tree felling and delimbing are tasks not necessarily analogous with excessively high levels of fatigue, even though the physiological measures categorised motor-manual felling and delimbing as being moderate to heavy workload tasks. Chronic fatigue was avoided, and acute fatigue mitigated by the effective use of the fallers self-pacing mechanism, combined with both structured and spontaneous rest breaks analogous with the work method adopted by motor-manual fallers. Consequently, production was not negatively affected by the progression of the working day. Poor work postures commonly adopted by the fallers encourage the progressive development musculo-skeletal damage. Hazards encountered by the subjects followed national trends for felling and trimming. Significant decreases in thermal comfort and sensation ratings occurred, accompanied by an increase in the skin wettedness rating and higher thermal regulation ratings for the majority of the fallers. No discernible increase in mental fatigue could be identified during the study. The ambient thermal environment and work site terrain had minimal effect on the subjects performance levels or physiological and psycho-physiological loadings.
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    Increasing seatbelt usage in logging skidders through behaviour modification and seatbelt design : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Psychology at Massey University
    (Massey University, 1994) Sullman, Mark J. M.
    This study examined methods for increasing seatbelt usage in one type of heavy logging machine (the skidder). This machine is used extensively for extracting felled trees and transporting them from where they are cut down to a central processing area. Preliminary investigations suggested that the operators of these machines failed to wear their seatbelts because they were poorly designed and because the operators simply forgot. A survey of the literature on increasing safety behaviours found that the two most powerful techniques were behaviour modification and human factors engineering (or ergonomics). Therefore, these were the two techniques used here. The standard seatbelts were redesigned to make them easier to use and an orange flashing reminder light was installed into the machines of seven full-time skidder operators. These machines were operating in either Kaingaroa, Rotoehu, Tahorakuri or Te Whakao Forests in the central North Island of New Zealand. The experiment used a multiple baseline single subject design, with the subjects receiving each treatment twice. With the installation of the redesigned seatbelt, mean seatbelt usage for six subjects rose from 21% to 31%. One subject refused to wear a seatbelt throughout the experiment. Installing the reminder light increased seatbelt usage by a further 1%. Removing the new seatbelt design caused usage to drop 16%. A further decrease of 5% occurred with the return to baseline phase when the reminder light had also been removed. The second introduction of the new seatbelt resulted in an increase in usage from 10% to a mean level of 46%. This was increased a further 22% with the reintroduction of the reminder light. The results showed that an easier to use seatbelt in combination with a reminder light can increase the level of seatbelt usage. The results also provide further evidence of the power of both behaviour modification techniques and human factors engineering in the field of occupational safety.
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    The 'climates' of the logging industry : effects on safety, commitment, turnover, and accidents : a thesis presented in partial fulfilment of the requirements for the degree of Master of Arts (Soc. Sci.) in Psychology at Massey University
    (Massey University, 1999) Rothwell, Kelly A
    New Zealand's logging industry is one of the country's largest exporting industries. With increased global competition and demands, work environments like the logging industry are finding that problems such as accidents and turnover rates are intensifying. Much research has been completed on accident and turnover rates, yet no decrease is apparent. New approaches in identifying reasons for such problems are therefore necessary. Gaining knowledge of the rationale for high turnover and accident rates (adverse activities) within the logging industry included investigating the general PC, group and organisational climate, safety climate, organisational commitment and intentions to quit (job behaviours/perceptions)of logging industry members. Field and Abelson's (1982) model asserts that PC can affect job behaviours/perceptions and adverse activities. Their 'new evolution' model of climate also argues that aggregation of psychological climate (PC) perceptions to gain evidence of group and organisational climate is possible if there is consensus in PC perceptions within groups and across organisations. Respondents were a heterogeneous group of contractors (n=6) and crew members (n=67) drawn from a list of Corporate and Woodlot crews provided by Carter Holt Harvey Limited and Fletcher Challenge Limited. The relationships between demographic variables and PC were examined using analysis of variance (ANOVA). ANOVA's and Pearson r's correlations were also performed to analyse potential relationships between all the variables to determine effects on the adverse activities of the logging industry. The psychological climate, safety climate, organisational commitment, and intentions to turnover variables were found to be rather negative in direction. Aggregation of PC to group level climate proved unfruitful because of the lack of consensus within crews. However, organisational climate was evident across the logging industry. Some PC variables were found to be significantly related to safety climate variables, organisational commitment variables, and intention to quit variables. The contractors perceptions of the PC variables role ambiguity and workgroup friendliness and warmth were significantly related to crewmember turnover rates. Moreover, the contractors perceptions of the safety climate variable fatalism were significantly related to crewmember accident rates. The research limitations and implications were discussed along with recommendations for future research.
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    Accidents and safety in New Zealand logging : the central role of the contractor : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Health Science at Massey University
    (Massey University, 1999) Rowsell, Stephen Raymond
    New Zealand logging has a high accident rate which has concerned health and safety personnel, accident insurers, researchers and members of the industry. Efforts to reduce logging accidents and to promote safety, have included development of better equipment and training methods, and understanding of patterns of accident occurrence. The research to date has been mainly quantitative, and focused on individual factors. The aim of the present study was to develop an understanding of the social processes which surround logging accidents to provide a broader perspective of accident causation and its implications for safety promotion. 47 loggers and 32 logging contractors from three regions of New Zealand participated in unstructured interviews which were recorded, transcribed and coded with the assistance of NUD.IST, a computer programme. Personal observations in the workplace and numerous informal discussions with a range of industry personnel, complemented the interviews. The qualitative methodology, Grounded Theory (Strauss & Corbin, 1990), was chosen to analyse the data. The results show that loggers perceive that individual factors such as risk-taking, violation of regulations, training, experience, equipment used, and the physical environment affect safety. The analysis of the data revealed that the impact of all these factors is moderated by the contractor who, in such an isolated environment, has a dominant role in the crew culture. The ability of the contractor to organise and motivate workers so that time can be allowed for learning and using appropriate techniques was critical to the safety of the crew. Frequent restructuring of the logging industry, together with falling log prices, have created instability which has impinged on the ability of contractors to run their crews safely. Increased expectations for production have placed pressure on safety systems. Some contractors managed to maintain safety through a proactive approach to training, efficient systems, and a positive safety culture while still being able to improve production. There is a widening gap between contractors who have responded proactively to the changes and those who have resisted them and struggled to manage in the new environment.