Ergonomic Evaluation of California Winegrape Trellis Systems
2002
The winegrape industry suffers from high incidence rates of work related musculoskeletal
disorders (MSDs). Pruning of dormant vines requires long periods of highly repetitive and physically
demanding work that increases risk for MSDs. The purpose of this study is to quantify risk factors
associated with the development of musculoskeletal injuries to the wrist and lower back while
pruning five commonly used winegrape trellis systems. Eleven subjects (10 male, 1 female)
participated in this study. Subjects performed a simulated pruning task as wrist and trunk postures
and psychophysical data were gathered. The results showed significant differences among the trellis
systems. Compared to the other systems, the vertical shoot positioned (VSP) was determined to be
most optimal in terms of decreasing relative MSD risk. These results will assist vineyards in
selecting suitable trellis systems that may improve worker health.
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