Keefer D J, Tseh W, Caputo J L, Apperson K, McGreal S, Vint P, Morgan D W
Department of Wellness and Sport Sciences, Millersville University, PA 17551-0302, USA.
Electromyogr Clin Neurophysiol. 2004 Mar;44(2):103-10.
The purpose of this study was to quantify interrelationships among thigh muscle co-contraction, quadriceps muscle strength, and the aerobic demand of walking in 13 children with spastic hemiplegic cerebral palsy (CP). During Session 1, subjects were familiarized with testing procedures, given five minutes of treadmill walking practice, and completed quadriceps muscle strength testing. In Session 2, subjects performed three 5-min walking bouts on the treadmill at 0.67 m x s(-1) to further accommodate to treadmill ambulation. During Session 3, resting VO2 was measured and subjects walked at 0.67, 0.89, and 1.12 m x s(-1) for five minutes while oxygen uptake (VO2) and thigh muscle co-contraction data were collected. Results demonstrated that no significant relationship existed between net VO2 and measures of thigh muscle co-contraction or quadriceps muscle strength. In addition, thigh muscle co-contraction was not shown to be associated with quadriceps muscle strength. Collectively, thigh muscle co-contraction and quadriceps muscle strength explained 13. 5%, 6.2%, and 2.2% of the variance in VO2 at 0.67, 0.89, and 1.12 m x s(-1), respectively. Viewed in concert, these results suggest that the walking energy expenditure of children with spastic hemiplegic CP is not influenced by the level of thigh muscle co-contraction or quadriceps muscle strength.
本研究旨在量化13名痉挛性偏瘫型脑瘫（CP）儿童大腿肌肉协同收缩、股四头肌力量与步行有氧需求之间的相互关系。在第1阶段，让受试者熟悉测试程序，进行5分钟的跑步机步行练习，并完成股四头肌力量测试。在第2阶段，受试者在跑步机上以0.67 m·s⁻¹的速度进行三次5分钟的步行，以进一步适应跑步机行走。在第3阶段，测量静息VO₂，受试者分别以0.67、0.89和1.12 m·s⁻¹的速度步行5分钟，同时收集摄氧量（VO₂）和大腿肌肉协同收缩数据。结果表明，净VO₂与大腿肌肉协同收缩或股四头肌力量测量值之间不存在显著关系。此外，大腿肌肉协同收缩与股四头肌力量无关。总体而言，大腿肌肉协同收缩和股四头肌力量分别解释了速度为0.67、0.89和1.12 m·s⁻¹时VO₂变化的13.5%、6.2%和2.2%。综合来看，这些结果表明，痉挛性偏瘫型CP儿童的步行能量消耗不受大腿肌肉协同收缩水平或股四头肌力量的影响。
