Figure 3

Procedure used to allow the monitoring of the pelvis and lumbar spine without interference from the lumbar belts. The upper inertial sensor, positioned on the thoracic spine, was secured on a piece of foam (A), allowing the wire not to interfere with the LB. The lower inertial sensor was glued on an angulated piece of plastic (A), which was inserted in a hole just below the short pants elastic band (B) and secured on the sacrum by three means (glue, Hypafix tape, 3-cm wide elastic band surrounding the sacrum and antero-superior iliac spines). The elastic band was deemed required during the control (no LB) condition and could not provide any lumbar support. The LBs were simply overlying the 3-cm elastic band, the plastic plate and the sacrum (C), which prevented any discomfort during the trials. Consent to publish was given by the model in this image.