Study of differences in peripheral muscle strength of lean versus obese women: an allometric approach
Study of differences in peripheral muscle strength of lean versus obese women: an allometric approach
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DOI：
10.1038/sj.ijo.0801560
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发表时间：
2001-05-01
影响因子：
4.9
通讯作者：
Brumagne, S
中科院分区：
文献类型：
--
作者：
Hulens, M;Vansant, G;Brumagne, S
目的：采用异速测量方法，研究在年龄和体力活动控制下，瘦女性和肥胖女性的外周肌力是否有显著差异。设计：等速握力和等速腿部和躯干肌肉力量的横断面研究。研究对象：173名肥胖女性（年龄39.9 +/- 11.4岁，体重指数（BMI） 37.8 +/-5.3kg/m(2)）和80名瘦弱女性（年龄39.7 +/- 12.2岁，BMI 22.0 +/- 2.2 kg/m(2)）。测量：人体测量（体重、身高）和身体组成（生物电阻抗法），等速握力（在Jamar测力计上最大自主收缩），等速躯干屈伸、躯干旋转和膝关节屈伸（Cybex测力计）。结果：与瘦女性相比，肥胖女性的绝对等速力量输出（即无脂量未校正的力量）更大，但膝关节屈曲和等距握力差异无统计学意义（P < 0.05）。在瘦女性（r = 0.28-0.53, P < 0.05）和肥胖女性（r = 0.29-0.49, P < 0.001）中，力量测量与无脂质量（kg）之间的Pearson相关系数均为低至中等。瘦子与脂肪质量（kg）没有相关性，而在肥胖女性中，大多数等动力学数据可以观察到微弱的正相关（r = 0.21-0.39, P < 0.01）。当校正无脂质量（通过异速缩放法提高到最佳指数）时，所有的力量测量结果都表明肥胖女性比苗条女性低至少6%，除了躯干屈曲，肥胖女性的躯干屈曲比苗条女性强至少8%。讨论：与瘦子相比，肥胖样本中腿部的绝对膝关节伸展强度更高，躯干的伸展强度相似，这可能是由负重和支持较大体重的训练效果所解释的。然而，当不含脂肪量的独立影响被去除时，这些力量测量，以及腹斜肌和握力，在肥胖女性中被证明是较低的。这些观察结果可能反映了肥胖及其代谢并发症对身体健康的整体损害。
OBJECTIVE: To investigate whether peripheral muscle strength is significantly different between lean and obese women controlled for age and physical activity, using an allometric approach.DESIGN: Cross-sectional study of isometric handgrip and isokinetic leg and trunk muscle strength.SUBJECTS: 173 obese (age 39.9 +/- 11.4y, body mass index (BMI) 37.8 +/-5.3kg/m(2)) and 80 lean (age 39.7 +/- 12.2 y, BMI 22.0 +/- 2.2 kg/m(2)) women.MEASUREMENTS: Anthropometric measures (weight, height) and body composition (bioelectrical impedance method), isometric handgrip (maximal voluntary contraction on the Jamar dynamometer), isokinetic trunk flexion-extension, trunk rotation, and knee flexion-extension (Cybex dynamometers).RESULTS: Absolute isokinetic strength output (that is, strength uncorrected for fat-free mass) was larger in obese compared to lean women, except for knee flexion and isometric handgrip, which were not significantly different (P > 0.05). Pearson correlation coefficients between strength measures and fat-free mass (kg) were low to moderate both in lean (r = 0.28-0.53, P > 0.05) and in obese (r = 0.29-0.49, P < 0.001) women. There was no correlation with fat mass (kg) in the lean, whereas in the obese women a weak positive relation could be observed for most isokinetic data (r = 0.21-0.39, P < 0.01). When correcting for fat-free mass (raised to the optimal exponent determined by allometric scaling), all strength measurements were at least 6% lower in obese when compared to the lean women, except for trunk flexion, which was at least 8% stronger in obese women.DISCUSSION: The higher absolute knee extension strength measures of leg and the similar extension strength of the trunk in the obese sample compared to the lean might be explained by the training effect of weight bearing and support of a larger body mass. However when the independent effect of fat-free mass is removed, these strength measures, as well as oblique abdominal muscle and handgrip strength, turned out to be lower in obese women. These observations could be the reflection of the overall impairment of physical fitness as a consequence of obesity and its metabolic complications.