Department of Physiotherapy, University of Valencia, Valencia, Spain.
Int J Sports Med. 2012 Jun;33(6):452-8. doi: 10.1055/s-0032-1301889. Epub 2012 Feb 29.
The principal aim of our study was the determination of the effectiveness of a standardized ratio, allometric scaling model and a gamma function model in normalizing the isometric torque data of spinal cord patients and healthy subjects. For this purpose we studied a sample of 21 healthy males and 23 spinal cord injury males. The experiment consisted of the measurement of the force of the upper limb movement executed by all the subjects. We also determined anthropometric variables with dual-energy x-ray absorptiometry. The experimental data were analyzed with 3 force normalization methods. Our results indicate that the most important confounding variable was the fat free mass of the dominant upper limb (r>0.36, p<0.05). With the standardization by body mass and allometric scaling model, the normalized torque was influenced by body size variables. However, the normalized torque by the gamma function model was independent of body size measures. Paraplegics were weaker (p<0.05) in extension movements when the data were normalized by the gamma function model. In summary, this study shows that the gamma function model with fat free mass of the dominant upper limb was more effective than the standardized ratio in removing the influence of body size variables.
我们研究的主要目的是确定标准化比率、比例缩放模型和伽马函数模型在规范脊髓病患者和健康受试者等速扭矩数据方面的有效性。为此，我们研究了 21 名健康男性和 23 名脊髓损伤男性的样本。实验包括测量所有受试者上肢运动的力。我们还通过双能 X 射线吸收法确定了人体测量学变量。用 3 种力归一化方法对实验数据进行了分析。结果表明，最重要的混杂变量是优势上肢的去脂体重（r>0.36，p<0.05）。用体重和比例缩放模型进行标准化后，归一化扭矩受体型变量的影响。然而，伽马函数模型的归一化扭矩与体型测量无关。用伽马函数模型归一化后，截瘫患者在伸展运动中较弱（p<0.05）。总之，本研究表明，用优势上肢的去脂体重对伽马函数模型进行标准化比标准化比率更能有效去除体型变量的影响。
