一种使用电刺激控制周期测力计的新算法。

New algorithm to control a cycle ergometer using electrical stimulation.

作者信息

Petrofsky J S

机构信息

Department of Physical Therapy, School of Allied Health, Loma Linda University, California, USA.

出版信息

Med Biol Eng Comput. 2003 Jan;41(1):18-27. doi: 10.1007/BF02343534.

DOI:10.1007/BF02343534

PMID:12572743

Abstract

Data were collected from four male subjects to determine the relationships between load, speed and muscle use during cycle ergometry. These data were then used to construct equations to govern the stimulation of muscle in paralysed individuals, during cycle ergometry induced by functional electrical stimulation (FES) of the quadriceps, gluteus maximus and hamstring muscles. The algorithm was tested on four subjects who were paralysed owing to a complete spinal cord injury between T4 and T11. Using the multivariate equation, the control of movement was improved, and work was accomplished that was double (2940 Nm min(-1) compared with 5880 Nm min(-1)) that of traditional FES cycle ergometry, when muscle stimulation was also controlled by electrical stimulation. Stress on the body, assessed by cardiac output, was increased almost two-fold during maximum work with the new algorithm (81 min(-1) compared with 15 l min(-1) with the new algorithm). These data support the concept that the limitation to workload that a person can achieve on FES cycle ergometry is in the control equations and not in the paralysed muscle.

摘要

从四名男性受试者收集数据，以确定在踏车测力计测试期间负荷、速度和肌肉使用之间的关系。然后，这些数据被用于构建方程式，以控制在由股四头肌、臀大肌和腘绳肌功能性电刺激（FES）诱发的踏车测力计测试期间瘫痪个体的肌肉刺激。该算法在四名因T4至T11之间完全脊髓损伤而瘫痪的受试者身上进行了测试。使用多变量方程式，运动控制得到改善，并且当肌肉刺激也由电刺激控制时，完成的工作量是传统FES踏车测力计测试的两倍（分别为2940 Nm min⁻¹和5880 Nm min⁻¹）。在使用新算法进行最大工作量测试期间，通过心输出量评估的身体压力增加了近两倍（分别为8 l min⁻¹和15 l min⁻¹）。这些数据支持这样一种观点，即个体在FES踏车测力计测试中能够达到的工作量限制在于控制方程式，而非瘫痪肌肉。