ASTM F3474-20

2.1?This practice describes what measure should be performed during the near (hours/days), mid (days/weeks), and far (months/years) stages of exoskeleton evaluation (Fig. 1). The functional conditions and metrics with respect to each task method are assessed from the body area(s) impacted by the exoskeleton (for example, upper body, lower body, or both). These may be within as well as distant to the body areas impacted by the exoskeleton (for example, an upper body exoskeleton may have impacts on the trunk and spine). Desired effects as well as unintended encumbrances to the users body are important considerations. The evaluation will occur within the context relevant to the end-use application of the exoskeletons implementation. This practice pertains to the industry, military, medical, first responders, and recreational domains, but other domains may arise in the future and will need to be considered. Each domain is unique unto itself; however, the task methods and metrics collected may be unique or overlap across any number of user domains.

2.2?Task methods and their metrics are either administered in a laboratory environment, field environment, or both laboratory and field environments. Where not otherwise specified, patient functional outcome measures and pain are key metrics that should be considered for testing performed in the medical domain. Exoskeleton producers or researchers, or both, may also want to consider different types of imaging such as X-rays, computed tomography (CT) scans, magnetic resonance imaging (MRI), ultrasound, and nuclear medicine imaging. Additionally, exoskeleton producers or researchers, or both, may also wish to carry out neuroimaging such as, but not limited to, structural and functional and diffusion MRI, magnetoencephalography (MEG), electroencephalography (EEG), positron emission tomography (PET), or near infrared spectroscopy (NIRS) to understand the cognitive and neurophysiological impacts that exoskeletons have on the brain.

2.3?Fig. 2 is a Venn diagram that portrays the distinct interactions that may transpire between the user (human), exoskeleton, and task. The interactions are:

2.4?This methodology indicates considerations that employers/users should use to govern which jobs are more suited to just humans versus humans with exoskeletons. Based on those results, human exoskeleton assessments can be performed using the ergonomic assessment decision chart to determine exoskeleton efficacy with respect to the task(s). From there, the human, exoskeleton, and task(s) are integrated into the organization (where applicable based on domain), tools/equipment, and environment of utilization. Furthermore, when conducting an assessment, please see Practice for Documenting Environmental Conditions for Utilization with Exoskeleton Test Methods for environmental ramifications.2.5?Depending on the context in which the exoskeleton is used (medical, industrial, military, first responders, and recreational), it is necessary to take into account these complementary characteristics to integrate the exoskeletons better.

1.1?This practice provides a recommended approach and a set of options for assessing one or more specific ergonomic parameters with respect to human users of exoskeletons.

1.2?This practice provides functional ergonomic criteria to consider for the design, production, and evaluation of exoskeletons within the domains of industry, military, medical, first responders, and recreational. When designing exoskeletons, natural unassisted human kinematics and kinetics, as well as the resulting strain and fatigue experienced by the user should be salient design parameters. Any changes in the natural unassisted human kinematics and kinetics may impact the exoskeletons effectiveness in augmenting user performance. Therefore, the defining principle of this practice is to establish objective measures that can be selected from to assess human kinematics and kinetics, as well as the resulting strain and fatigue experienced by the user within the task context of the exoskeletons end use application.

1.3?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.