本文件阐述了人类暴露于多个机械冲击的情况，并规定了测量多个冲击的要求。然后对这些测量结果进行分析，以提供信息，用于评估坐姿个体因压迫而对腰椎椎体终板产生不利健康影响的风险。即使端板没有受伤，也可能发生其他伤害。 注1:多重机械冲击是指在测量期间经常以规则和不规则间隔发生的不同大小和形状的冲击。 注2:按照附件中的建议，当前伤害风险的评估基于测量的代表性暴露以及个人暴露史。预期风险可通过预期暴露持续时间进行评估。鼓励测量设备制造商开发现场评估暴露的可能性。 本文件区分了两种暴露制度:一种适用于严重条件，另一种适用于不太严重的条件。 注3第4条对这两种制度进行了描述。 本文件适用于在座椅处测得的峰值高达137,3 m/s2（14 g）的未加权垂直加速度- 坐骨结节下方的乘员界面，测量带宽为0.01 Hz至80 Hz。 注4:5.1中定义了测量带。 当将该方法应用于严重暴露时，必须谨慎，尤其是因为137,3 m/s2（14 g）的峰值加速度接近脊柱可以承受的物理极限。

This document addresses human exposure to multiple mechanical shocks, and it formulates requirements for the measurement of multiple shocks. The results of these measurements are then analyzed to provide information for the assessment of the risk of adverse health effects to the vertebral end-plates of the lumbar spine for seated individuals due to compression. Other injuries could develop even when there is no injury to the end plate. NOTE 1 Multiple mechanical shocks are shocks of different magnitude and shape that occur frequently at regular and irregular intervals during the measurement period. NOTE 2 As proposed in the annexes, the assessment of the current injury risk is based on measured representative exposures in combination with the individual exposure history. Prospective risks can be assessed by anticipated exposure durations. Manufacturers of measurement equipment are encouraged to develop a possibility for an on-site evaluation of the exposure. Two exposure regimes are distinguished in this document: one for severe conditions and one for less severe conditions. NOTE 3 Clause 4 contains the delineation of the two regimes. This document is applicable for unweighted vertical accelerations that have peak values up to 137,3 m/s2 (14 g) measured at the seat-occupant interface beneath the ischial tuberosities over a 0,01 Hz to 80 Hz measurement bandwidth. NOTE 4 The measurement bandwith is defined in 5.1. Caution is necessary when applying the method to severe exposures, particularly since peak accelerations of 137,3 m/s2 (14 g) are close to the physical limit that a spine can tolerate.