Improvement of isokinetic knee extensor strength and reduction of postural sway in the elderly from long-term Tai Chi exercise.
Improvement of isokinetic knee extensor strength and reduction of postural sway in the elderly from long-term Tai Chi exercise.
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DOI：
10.1053/apmr.2002.34596
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发表时间：
2002-10
影响因子：
4.3
通讯作者：
Ge Wu;Fang Zhao;Xinglong Zhou;Liu-Jiao Wei
中科院分区：
文献类型：
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作者：
Ge Wu;Fang Zhao;Xinglong Zhou;Liu-Jiao Wei
目的：比较长期太极练习者和对照者的腿部肌肉和足部压力中心（COP）的等速力量，作为衡量摇摆的指标。设计横断面研究。设置社区设置。对象太极组20名受试者和对照组19名受试者（年龄>55岁）。干预太极拳组的受试者练习太极拳至少3年。主要观察指标：60 °/s和120 °/s时膝关节伸屈肌群的向心和离心肌力，以及安静站立睁眼或闭眼时足COP位移。结果太极组在所有测试速度下的膝关节伸肌力量显著高于对照组（P<0.013），在睁眼和闭眼条件下的足部COP偏移量均小于对照组（P<0.05）。两组患者屈膝肌功能无显著性差异（P<.713）。在大多数速度下，COP偏移与膝伸肌的离心力显著相关（P<0.07），但与膝伸肌的向心力（P<0.14）或膝屈肌的等速力无关（P<0.27）。结论长期练习太极拳有助于维持下肢姿势肌的离心力，有利于保持良好的姿势稳定性。
OBJECTIVES To compare isokinetic strength of leg muscles and foot center of pressure (COP) as a measure of sway between long-term Tai Chi practitioners and controls. DESIGN Cross-sectional study. SETTING Community setting. PARTICIPANTS Twenty subjects in the Tai Chi group and 19 subjects in the control group (age, >55 y). INTERVENTION Subjects in Tai Chi group had practiced Tai Chi for a minimum of 3 years. MAIN OUTCOME MEASURES Concentric and eccentric strength of knee extensors and flexors at 60 degrees/s and 120 degrees/s, and foot COP displacement during quiet stance with eyes open or closed. RESULTS People in the Tai Chi group had significantly higher knee extensor strength at all speeds tested (P<.013), and smaller foot COP excursions for both eyes open and eyes closed conditions (P<.05) than people in control group. No significant difference existed in knee flexors between the 2 groups (P<.713). The COP excursions correlated significantly with the eccentric strength of knee extensors (P<.07) but not with the concentric strength of knee extensors (P<.14) or with the isokinetic strength of knee flexors at most of the speeds (P<.27). CONCLUSION These findings support the hypothesis that the maintenance of eccentric strength of postural muscles in the lower extremities, which is beneficial for maintaining good postural stability, is helped through the long-term practice of Tai Chi.