Saddle heights alter the pelvis rotation kinematics: musculoskeletal modeling by OpenSim software
Poster Presentation
Paper ID : 1863-SSRC
Authors
خیر
Abstract
Introduction
The cycling is modern and high risk sport . Furthermore, the pelvis injuries are most usual in riders that influenced by the range of motion (ROM) of pelvis. The saddle height is an important factor that influenced by many factors. The lack of knowledge exist about the relationship between pelvis kinematics and saddle heights. Therefore, the aim of the current study was to compare two different saddle height to find the ROM of pelvis during cycling
Methods:
Twenty cycling athletes participated in this study (Mass: 75.3±6.5 kg, Heights: 180±6.3 cm, Age: 28.5±6.5 years). Ten Vicon motion captures (Vicon MX, Oxford, UK, 100 Hz) were used to measure the markers positions. The smart trainer (Tacx Flux, Netherland) was used to measure output power of bicycle. The inseam quantity (the distance from the uppermost of part of thigh to ankle) of each subject measured and then multiply to 0.883 to find standard saddle height that was choose as lower saddle. Then, we added the 4% to lower saddle height that was choose as upper saddle. The cadence remains at 60 rpm for times of cycling. The full body model used as base model in OpenSim . The personalized model created for each subject by scaling tool. The pelvis angles were estimated by inverse kinematics and then the DOF was calculated.
Results
The figure represents the mean and standard deviation of range of motion (ROM) of pelvis for two different saddle heights. Significant differences were observed for the pelvis rotation (p<0.05) where the DOF of the pelvis rotation for upper saddle and lower saddle were 6.79±1.43 and 3.93±1.31, respectively.
Discussion
The main goal of the current study was to evaluate the saddle heights effect on pelvis kinematics. Based on the results changing the saddle heights, alter all three rotational DOF although, the significant differences only found for pelvis rotation. These results indicate by increasing the saddle height, the DOF of pelvis rotation increase. Furthermore, more pelvis rotation during long time can increase risk injuries of pelvis, therefore, this study will be useful for coaches, and scientist to choose best saddle height.
The cycling is modern and high risk sport . Furthermore, the pelvis injuries are most usual in riders that influenced by the range of motion (ROM) of pelvis. The saddle height is an important factor that influenced by many factors. The lack of knowledge exist about the relationship between pelvis kinematics and saddle heights. Therefore, the aim of the current study was to compare two different saddle height to find the ROM of pelvis during cycling
Methods:
Twenty cycling athletes participated in this study (Mass: 75.3±6.5 kg, Heights: 180±6.3 cm, Age: 28.5±6.5 years). Ten Vicon motion captures (Vicon MX, Oxford, UK, 100 Hz) were used to measure the markers positions. The smart trainer (Tacx Flux, Netherland) was used to measure output power of bicycle. The inseam quantity (the distance from the uppermost of part of thigh to ankle) of each subject measured and then multiply to 0.883 to find standard saddle height that was choose as lower saddle. Then, we added the 4% to lower saddle height that was choose as upper saddle. The cadence remains at 60 rpm for times of cycling. The full body model used as base model in OpenSim . The personalized model created for each subject by scaling tool. The pelvis angles were estimated by inverse kinematics and then the DOF was calculated.
Results
The figure represents the mean and standard deviation of range of motion (ROM) of pelvis for two different saddle heights. Significant differences were observed for the pelvis rotation (p<0.05) where the DOF of the pelvis rotation for upper saddle and lower saddle were 6.79±1.43 and 3.93±1.31, respectively.
Discussion
The main goal of the current study was to evaluate the saddle heights effect on pelvis kinematics. Based on the results changing the saddle heights, alter all three rotational DOF although, the significant differences only found for pelvis rotation. These results indicate by increasing the saddle height, the DOF of pelvis rotation increase. Furthermore, more pelvis rotation during long time can increase risk injuries of pelvis, therefore, this study will be useful for coaches, and scientist to choose best saddle height.
Keywords