Open methods
FlexTail ergonomics research reports
A technical companion to the FlexTail Sensor Evaluation Playbook. Each report describes the data structure, calculations, code path, and limits of one analysis rather than presenting a product claim.
Report 01
Quantifying Lumbar and Axial Exposure From Continuous Spine Data
A reproducible explanation of the lumbar-twist exposure model used in the FlexTail HAR study, including feature construction, global normalisation, and interpretation limits.
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Activity Kinematics: Reading Distribution Shape, Not Just the Mean
How to analyse FlexTail activity recordings with participant-aware distributions, joint posture spaces, and a reproducible correction for the current sagittal-lateral plot implementation.
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Sitting Position Change: Detecting State Transitions in Continuous Posture Data
A technical report on the two-tier sitting-position-change workflow: sticky-reference detection within a day, day-to-day posture-vector change scores, exposure-normalised rates, and sensitivity analysis.
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Cleaning-Session Ergonomics: ISO Zones, Bend Events, and Frame-Level Quality
A detailed walkthrough of the cleaning-session analysis: ISO 11226 zone classification, pelvic-tilt escalation, hysteresis-based bend detection, and the configurable lift-evaluation score.
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