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Efficiency of work production by spastic muscles.

机译：痉挛性肌肉的工作效率。

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摘要

The present study compared the muscular efficiency in spastic and healthy lower limbs producing the same mechanical work. Sixteen chronic post-stroke hemiparetic and spastic patients and 14 age-matched healthy subjects were submitted to a submaximal stepwise exercise testing on a bicycle ergometer, pedalling with only one lower limb. Net energetic expenditure was computed from oxygen consumption above resting values. Electrical activity of antagonistic muscles in the thigh and in the shank was recorded and co-contraction was defined as the percentage of the pedalling cycle when antagonistic muscles were activated simultaneously. The efficiency was calculated as the ratio between the mechanical work done on the ergometer and the net energetic expenditure. Spasticity was quantitatively evaluated by measuring passive ankle plantar flexor muscle stiffness. The working capacity of the patients' paretic lower limb was very low (<40W). The energy expenditure increased linearly as a function of work intensity, without statistical difference between the patients paretic lower limb (PPL), the patients healthy lower limb (PHL) and the healthy subjects lower limb (HSL). Shank co-contraction was 2.9 times greater in PPL (p<0.05) and 2.3 times greater in PHL (p<0.05) than in HSL. Thigh co-contraction was also 1.8 times greater in PPL than in HSL (p<0.05). The ankle plantar flexor muscle stiffness was statistically greater in PPL than in PHL and HSL (p<0.05). The efficiency was not statistically different between the three groups (p=0.155). In conclusion, the efficiency of work production by paretic and spastic lower limb muscles was normal ( congruent with 20%) despite significant neurological impairments.
机译：本研究比较了痉挛和健康的下肢产生相同的机械功的肌肉效率。 16名慢性卒中后偏瘫和痉挛患者和14名年龄相匹配的健康受试者在自行车测功仪上进行了次最大的逐步运动测试，仅用一个下肢踩踏板。净能量消耗是根据高于静止值的氧气消耗量计算得出的。记录大腿和小腿中拮抗肌的电活动，同时收缩定义为同时激活拮抗肌时踩踏周期的百分比。效率计算为测功机上完成的机械功与能量消耗净额之比。通过测量被动脚踝plant屈肌的僵硬度来定量评估痉挛。患者腹部下肢的工作能力非常低（<40W）。能量消耗随工作强度呈线性增加，在患者稀有下肢（PPL），健康下肢（PHL）和健康受试者下肢（HSL）之间无统计学差异。与HSL相比，PPL中的小腿共收缩高2.9倍（p <0.05），PHL中高2.3倍（p <0.05）。在PPL中，大腿共收缩也比HSL大1.8倍（p <0.05）。在统计学上，PPL组的踝plant屈肌刚度在统计学上高于PHL和HSL组（p <0.05）。三组之间的效率无统计学差异（p = 0.155）。总之，尽管存在严重的神经功能障碍，但是下肢痉挛性和痉挛性生产的效率是正常的（相当于20％）。

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