ISO 20957.9:2021同样采用了ISO 20957-9:2016及其第1号修正案（2019年），该修正案规定了具有闭合模式运动和/或往复运动的心血管设备的安全要求，其中用户的脚设计为与脚平台接触，但不包括从站立或坐姿执行的步进器。

AS ISO 20957.9:2021 identically adopts ISO 20957-9:2016 and its Amendment No. 1 (2019), which specifies safety requirements for cardiovascular equipment with a closed pattern motion and/or a reciprocating motion, where the users feet are designed to be in contact with the foot platform, but not including steppers, performed from either a standing or seated position.