School of Rehabilitation and Occupation Studies, AUT University, Auckland, New Zealand.
J Neuroeng Rehabil. 2012 Sep 27;9:67. doi: 10.1186/1743-0003-9-67.
Stroke remains a leading cause of disability worldwide and results in muscle performance deficits and limitations in activity performance. Rehabilitation aims to address muscle dysfunction in an effort to improve activity and participation. While muscle strength has an impact on activity performance, muscle power has recently been acknowledged as contributing significantly to activity performance in this population. Therefore, rehabilitation efforts should include training of muscle power. However, little is known about what training parameters, or load, optimize muscle power performance in people with stroke. The purpose of this study was to investigate lower limb muscle power performance at differing loads in people with and without stroke.
A cross-sectional study design investigated muscle power performance in 58 hemiplegic and age matched control participants. Lower limb muscle power was measured using a modified leg press machine at 30, 50 and 70% of one repetition maximum (1-RM) strength.
There were significant differences in peak power between involved and uninvolved limbs of stroke participants and between uninvolved and control limbs. Peak power was greatest when pushing against a load of 30% of 1RM for involved, uninvolved and control limbs. Involved limb peak power irrespective of load (Mean:220 ± SD:134 W) was significantly lower (p < 0.05) than the uninvolved limb (Mean:466 ± SD:220 W). Both the involved and uninvolved limbs generated significantly lower peak power (p < 0.05) than the control limb (Mean:708 ± SD:289 W).
Significant power deficits were seen in both the involved and uninvolved limbs after stroke. Maximal muscle power was produced when pushing against lighter loads. Further intervention studies are needed to determine whether training of both limbs at lighter loads (and higher velocities) are preferable to improve both power and activity performance after stroke.
中风仍然是全球范围内导致残疾的主要原因，会导致肌肉功能障碍，并限制活动表现。康复的目的是解决肌肉功能障碍，努力提高活动和参与能力。虽然肌肉力量对活动表现有影响，但最近人们认识到肌肉力量对该人群的活动表现有重要贡献。因此，康复工作应包括肌肉力量训练。然而，对于什么训练参数或负荷可以优化中风患者的肌肉力量表现，人们知之甚少。本研究的目的是调查有和没有中风的人在不同负荷下下肢肌肉力量表现。
一项横断面研究设计调查了 58 名偏瘫患者和年龄匹配的对照组参与者的肌肉力量表现。使用改良腿推机器在 1 重复最大强度的 30%、50%和 70%下测量下肢肌肉力量。
中风患者的受累和未受累肢体以及未受累和对照组肢体之间的峰值力量存在显著差异。在推 30% 1RM 负荷时，受累、未受累和对照组肢体的峰值力量最大。无论负荷如何，受累肢体的峰值力量（均值：220±SD：134 W）明显低于未受累肢体（均值：466±SD：220 W）（p<0.05）。受累和未受累肢体的峰值力量均明显低于对照组肢体（均值：708±SD：289 W）（p<0.05）。
中风后，受累和未受累肢体都存在明显的力量缺陷。在推动较轻负荷时，产生最大肌肉力量。需要进一步的干预研究来确定在较轻负荷（和更高速度）下训练双侧肢体是否更有利于改善中风后的力量和活动表现。
