Comparison of isokinetic knee muscle strength under different angular velocity and temporal-distance gait parameter

doi:10.3969/j.issn.2095-4344.2014.07.008

Abstract

Abstract:

BACKGROUND: The current studies concerning the effect of obesity on children are limited to metabolic physiology, and there is little evidence available on skeletal muscle and motor ability.
OBJECTIVE: To compare isokinetic knee muscle strength between obese children and normal children, and analyze the causes of physical performance decline in obese children.
METHODS: A total of 56 children were recruited in this study, including 28 obese children and 28 normal children. The isokinetic muscle strength was tested by CON-TREX. The gaits were tested by VICON. The statistical analysis of all the differences between obese children and normal children were measured using SPSS 19.0 software.
RESULTS AND CONCLUSION: At the same gait speed, obese children had higher absolute peak torque and average power than normal children (P < 0.05), but relative peak torque and relative average power showed no significant difference compared with normal children (P > 0.05) except extensor group at 60(°)/s was significantly lower than normal children. At the same gait speed, the torque and power of extensor group were significantly higher than that of flexor group in the two groups (P < 0.05); he obese children showed significant differences in the absolute peak torque and absolute average power compared with relative peak torque and relative average power of flexor group at 120(°)/s (P < 0.05). In the two groups, the extensor exhibited higher torque in high speed, while the high flexor torque was found in low speed. Normal children had faster cadence and walking speed, significantly smaller step width and shorter stride time than obese children (P < 0.05). Obese children have smaller relative strength and higher absolute strength than normal children; in addition, the low cadence and walking speed are found in obese children. These factors contribute to weak limb strength and insufficient motor ability.

中国组织工程研究杂志出版内容重点：组织构建；骨细胞；软骨细胞；细胞培养；成纤维细胞；血管内皮细胞；骨质疏松；组织工程

全文链接：

Key words: overweight, child, muscle strength, knee joint

CLC Number:

R318

Ji Zhi-guang, Zhuang Jie, Huang Liang. Comparison of isokinetic knee muscle strength under different angular velocity and temporal-distance gait parameter[J]. Chinese Journal of Tissue Engineering Research, 2014, 18(7): 1027-1032.

Figures/Tables 2

2.1 峰值力矩绝对峰力矩：在相同角速度下肥胖组的伸力矩和屈力矩均显著大于正常组(P < 0.05)。正常组内同肌群角速度120 (°)/s与60 (°)/s之间差异有显著性意义(P < 0.05)，而肥胖组内同肌群角速度120 (°)/s与60 (°)/s之间差异无显著性意义(P > 0.05)。肥胖组内在120 (°)/s下伸肌群和屈肌群峰力矩之间差异有显著性意义(P < 0.05)，见表2。相对峰值力矩：在120 (°)/s速度下的相对伸肌力矩和屈肌力矩在两组之间差异均无显著性意义(P > 0.05)，而在60 (°)/s速度下的屈肌力矩在两组之间差异也无显著性意义(P > 0.05)，伸肌力矩正常组高于肥胖组，两组之间差异有显著性意义(P < 0.05)。正常组内只有屈肌群在两个角速度之间差异有显著性意义(P < 0.05)，而肥胖组内伸肌群、屈肌群在两个角速度之间差异均有显著性意义(P < 0.05)。正常组内在60 (°)/s速度时伸肌群与屈肌群之间差异有显著性意义(P < 0.05)，肥胖组内在120 (°)/s速度时伸肌群与屈肌群之间差异有显著性意义(P < 0.05)，见表2。 2.2 平均功率绝对平均功率：在相同角速度下肥胖组的伸肌和屈肌平均功率都显著大于正常组(P < 0.05)。正常组内同肌群角速度120(°)/s与60(°)/s之间差异有显著性意义(P < 0.05)，而肥胖组内只有屈肌群在角速度120(°)/s与60(°)/s之间差异有显著性意义(P < 0.05)。肥胖组内在120(°)/s下伸肌群和屈肌群平均功率之间差异有显著性意义(P < 0.05，表2)。相对平均功率：同肌群同角速度条件下两组间差异均没有显著性意义(P > 0.05)。正常组内只有屈肌群在两个角速度之间差异有显著性意义(P < 0.05)，而肥胖组内伸肌群、屈肌群在两个角速度之间差异均有显著性意义(P < 0.05)。正常组内在60 (°)/s速度时伸肌群与屈肌群之间差异有显著性意义(P < 0.05)，肥胖组内在120 (°)/s和60 (°)/s速度时伸肌群与屈肌群之间差异均有显著性意义(P < 0.05)，见表2。 2.3 总功同肌群同角速度条件下肥胖组的伸肌和屈肌总功都显著大于正常组(P < 0.05)。正常组内同肌群在角速度120 (°)/s与60 (°)/s之间差异有显著性意义(P < 0.05)，而肥胖组内同肌群角速度120 (°)/s与60 (°)/s之间差异无显著性意义(P > 0.05)。正常组内在60 (°)/s速度时伸肌群与屈肌群之间差异有显著性意义(P < 0.05)，肥胖组内在 120 (°)/s速度时伸肌群与屈肌群之间差异有显著性意义 (P < 0.05)，见表2。"

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