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This series of reports provides response characteristics of the head, face, neck, shoulder, thorax, lumbar spine, abdomen, pelvis, and lower extremities. In each report, the descriptions of human impact response are based on data judged by the subcommittee to provide the most appropriate information for the development of human surrogates.This is one of a series of reports which define human mechanical impact response characteristics for specific body regions. These reports update SAE J1450 which is intended for use by anthropomorphic test dummy designers and analytical modelers who need qualitative definitions of human mechanical impact behavior. These reports do not discuss criteria for assessing human impact injury potential, which are the subject of a separate SAE information Report SAE J885. Each document in the series covers material specific to a body region and will be independently updated when new response data become available.