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Workplace Factors and Trunk Motion in Grocery Selector Tasks

Thousands of workers in the United States are employed as grocery selectors, a job requiring manual selection of grocery products from a warehouse for delivery to individual grocery stores. The selection process consists of lifting and carrying large volumes of case-size grocery products from pallets located in storage racks to shipping pallets located on a motorized jack that is moved along the aisles. The national rate of back injuries for grocery selectors is not known, but as an occupation, males working in the wholesale grocery industry have an estimated annual prevalence of back pain caused by an 'activity at work' of 16.4% (Guo, 1993). Results of a survey of Workers' Compensation programs, supplied by the National Association of Wholesale Grocers Association (NAWGA) and the International Foodservice Distributors Association (IFDA) for the year 1990, revealed that back spraidstrains accounted for 30% of all injuries for food distribution warehouse workers. The report also indicated that in one case, more than 54% of the back injuries were attributable to manual lifting.