Unnithan V B, Dowling J J, Frost G, Bar-Or O
Children's Exercise and Nutrition Centre, McMaster University, Hamilton, Ontario, Canada.
Med Sci Sports Exerc. 1996 Dec;28(12):1498-504. doi: 10.1097/00005768-199612000-00009.
A major movement related limitation for children with spastic cerebral palsy (CP) is the compromised gait pattern, which may explain their excessive energy cost of locomotion. The aims of this study were to determine differences in the O2 cost of locomotion between children with CP (7 males, 2 females; 12.7 +/- 2.8 yr) and able-bodied controls (7 male, 1 female; 13.6 +/- 2.1 yr) and to assess the contribution that cocontraction of agonist and antagonist muscles had upon the elevated O2 cost seen in children with CP versus able-bodied controls. The treadmill submaximal walking protocol consisted of 2 x 4 min intermittent stages at 3 km.h-1 and 90% of the predetermined fastest walking speed (FWS) at 0% grade. Electromyographic data were collected during the final minute of each bout from vastus lateralis and hamstrings (thigh) and tibialis anterior and soleus (lower leg). Significant (P < 0.05) differences were noted at 3 km.h-1 for mass-relative VO2. (CP: 16.6 +/- 6.5 vs control: 10.2 +/- 1.2 ml.kg-1.min-1), % VO2max (CP: 53.5 +/- 26.0 vs
22.5 +/- 4.93) and heart rate (CP: 143 +/- 41 vs
91 +/- 14 beats.min-1). Thigh and lower leg muscle cocontraction accounted for 51.4% and 42.8%, respectively, of the variability in VO2 for the subjects with CP at 3 km.h-1. These results suggest that cocontraction is a major factor responsible for the higher energy cost of walking seen in children with CP.
痉挛型脑瘫（CP）患儿主要的运动相关限制是步态模式受损，这可能解释了他们行走时过高的能量消耗。本研究的目的是确定CP患儿（7名男性，2名女性；12.7±2.8岁）与健全对照组（7名男性，1名女性；13.6±2.1岁）之间运动时氧气消耗的差异，并评估主动肌和拮抗肌共同收缩对CP患儿与健全对照组相比氧气消耗升高的影响。跑步机次最大步行方案包括在3 km·h-1的速度下进行2×4分钟的间歇阶段，以及在0%坡度下以预定最快步行速度（FWS）的90%进行。在每个回合的最后一分钟收集股外侧肌、腘绳肌（大腿）、胫前肌和比目鱼肌（小腿）的肌电图数据。在3 km·h-1时，观察到质量相对VO2有显著（P<0.05）差异。（CP组：16.6±6.5，对照组：10.2±1.2 ml·kg-1·min-1），%VO2max（CP组：53.5±26.0，对照组：22.5±4.93）和心率（CP组：143±41，对照组：91±14次·min-1）。在3 km·h-1时，大腿和小腿肌肉共同收缩分别占CP组受试者VO2变异性的51.4%和42.8%。这些结果表明，共同收缩是CP患儿行走时能量消耗较高的主要因素。
