跑步机上行走与平地行走膝关节运动差异性研究

Differences between knee movements walking on flat ground and on a treadmill

为了解人在跑步机上行走与在地面行走的差异性,基于多元信息融合算法,通过对20名健康男性青年在平地行走和跑步机上行走时膝关节转角及步态相位的数据对比分析,发现了二者之间的共性和差异性,并对曲线进行了模型分析,结果表明在跑步机上行走较在平地行走稳定性差,膝关节转角波动范围是平地上行走的2~3倍以上。为了保证跑步机上行走的平稳性,人主观上通过使摆动腿提前着地,减小摆动时间,从而增加双脚同时与跑台的接触时间来保持行走的平衡性和稳定性,摆动腿着地时刻的膝关节弯曲角度明显大于平地上行走。Gauss扩展函数只适合于对平地行走时膝关节的转角曲线进行模型分析,跑步机上行走时膝关节转角曲线可采用Fourier函数建立数学模型。以上结论在康复器械、宇航员训练和体育研究领域具有一定的应用价值。

To examine the difference between walking on the ground and on a treadmill,the knee joint angle and gait phases of 20 healthy men were analyzed by multi-information fusion algorithm,then the similarities and differences between walking on the ground and the treadmill were discovered. Model analysis of the curves were conducted showing that walking on a treadmill has less stability than walking on the ground,and the fluctuation range of the knee joint angle is 2 to 3 times more than walking on flat ground. In order to ensure stable walking on a treadmill,the experimentees put their swinging feet down ahead of time,reducing the swing time,so the contact time between their feet and the treadmill was increased to keep balance and stability. The bending angle of knee joints when swinging feetland on the treadmill shows to be obviously larger than walking on the ground. Concluding,the Gauss expansion function is only suitable for model analysis of the knee joint angle curve while walking on flat ground. The knee joint angle curve while walking on a treadmill can better be mathematically modelled by Fourier function. This has design and application value in rehabilitation equipment,astronaut training,and sports research.