Poster Presentation

Paper ID : 1532-SSRC

نداریم

This research aimed to investigate the impact of saddle height on hip joint contact forces during cycling, employing musculoskeletal modeling. Joint contact loads are crucial indicators of injury risk and human performance. With certain mechanical components of bicycles directly interacting with the human body, they can directly influence the musculoskeletal system. Saddle height is a critical variable affecting lower limb joint stability and balance control. Twelve cyclists with road bike and no pain or injuries(Heights: 180±6.3 cm, Age: 29±10 years ) that at least do cycling 10 hours a week participated in this study. We use plug in gait marker placement method ,Marker positions were measured using 12 Vicon motion capture cameras (Vicon MX, Oxford, UK, 100 Hz). Output power of the bicycle was measured using a smart trainer (Tacx Flux, Netherlands) all output power about 100±5% . measure cadence with favero assioma duo pedal ,all riders cadence 60±3 RPM . Each subject's inseam length (distance from the uppermost part of the thigh to the ankle) was measured and multiplied by 0.883 to determine the standard saddle height, which was used as the lower saddle position. The start time of cycling was defined as the highest position of the right crank (right toe at the highest height) with a crank angle (CA) of CA=0°. OpenSim's inverse kinematics, inverse dynamics, static optimization, and joint contact analysis tools were employed to calculate joint angles, joint moments, muscle loads, and joint contact loads for two saddle height positions. The results revealed that saddle height significantly influenced in lower limb joint kinematics and kinetics. Specifically, saddle height had a major effect on the hip anterior-posterior direction during the acceleration phase (power phase) of cycling (CA=90° to CA=180°), while its impact on the hip superior-inferior direction was prominent during the rest phase (recovery phase) of cycling between (CA=270 to CA=360°). this study shows that in higher saddle position reduce hip joint load for this cyclist .we hope this paper helps all bikefitter to understand how body works on bike to prevent and rehabilitation injuries.

Biomechanics; Cycling; Musculoskeletal Sports injuries; model; OpenSim; Hip joint load