A dynamic model of a bicyclist’s lumbar spine was developed to evaluate the linear and angular variation of intervertebral distance in sagittal plane. Ten degrees of freedom biomechanical model of the spine was solved numerically. Larger loads acting on a cyclist spine were predicted mostly while sitting in a sport position in comparison with recreation or middle sitting. The load on the lumbar spine region is influenced by cycle’s tire pressure, road bumps and riding velocity.

Keywords: spine, biomechanical model, dynamics, bicycling, accelerometry, force