SABEL Labs, College of Health and Human Science, Charles Darwin University, 0810 Darwin, Australia.
School of Engineering, Griffith University, 4111 Nathan, Australia.
Sensors (Basel). 2021 Jan 28;21(3):871. doi: 10.3390/s21030871.
In the multisport of triathlon cycling is the longest of the three sequential disciplines. Triathlon bicycles differ from road bicycles with steeper seat tube angles with a change to saddle height altering the seat tube angle. This study evaluated the effectiveness of a tri axial accelerometer to determine acceleration magnitudes of the trunk in outdoor cycling in two saddle positions. Interpretation of data was evaluated based on cadence changes whilst triathletes cycled in an aerodynamic position in two saddle positions. The evaluation of accelerometer derived data within a characteristic overground setting suggests a significant reduction in mediolateral acceleration of the trunk, yielding a 25.1% decrease when saddle height was altered alongside reduced rate of perceived exertion (3.9%). Minimal differences were observed in anteroposterior and longitudinal acceleration. Evaluation of sensor data revealed a polynomial expression of the subtle changes between both saddle positions. This study shows that a triaxial accelerometer has capability to continuously measure acceleration magnitude of trunk movements during an in-the-field, varied cadence cycle protocol. Accessible and practical sensor technology could be relevant for postural considerations when exploring saddle position in dynamic settings.
在多项运动的铁人三项中，自行车项目是三个连续项目中最长的一项。铁三自行车与公路自行车的区别在于座管角度更陡，鞍座高度的改变会改变座管角度。本研究评估了三轴加速度计在两种鞍座位置下户外骑行时确定躯干加速度大小的有效性。根据运动员在两种鞍座位置下以空气动力学姿势骑行时踏频的变化来评估数据的解释。在典型的地面设置中对加速度计数据的评估表明，躯干的横向加速度显著降低，当鞍座高度改变时，降低了 25.1%，而感知用力率（3.9%）降低。在前后和纵向加速度方面观察到最小差异。传感器数据的评估显示了两种鞍座位置之间细微变化的多项式表达式。本研究表明，三轴加速度计具有在现场、变化的踏频周期协议中连续测量躯干运动加速度大小的能力。在探索动态环境中的鞍座位置时，可访问且实用的传感器技术可能与姿势考虑有关。
