From Lab to Field: Translating Inertial Motion Capture into Applied Ergonomic Risk Assessment and Intervention

Abstract

Wearable inertial motion capture (IMC) systems enable biomechanical assessments in environments where traditional optical systems are impractical. This presentation highlights three studies using the Xsens Awinda IMC system. The first validated IMC-based estimates of L5/S1 moments against optical motion capture (OMC) and force plates across varied lifting conditions, finding ~12–13% underestimation and RMSEs of 19–21 Nm. The second deployed IMC in an automotive plant to assess cumulative low back exposure using a fatigue failure-based framework. Cumulative damage estimates, derived from modeled lumbar moments, were significantly associated with self-reported low back pain (OR = 2.16). The third evaluated the Power Hook, an assistive tool for manhole cover lifting. IMC data revealed up to 36% reductions in peak L5/S1 moments and decreases in shear and compressive forces of up to 20% and 30%, respectively. Collectively, these studies illustrate how IMC and biomechanical modeling support ergonomic risk assessment and intervention in both laboratory and field settings.

Keywords: Inertial motion capture, cumulative damage, fatigue failure, L5/S1 moments, ergonomic interventions, field validation.

DOI: 10.54941/ahfe1006356