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Factor structure of trunk performance data for healthy subjects
1Department of Industrial Management, National Taiwan University of Technology and Science, No. 43 Kee-Lung Road, Sec 4, Taipei, Taiwan, ROC. yhlee@im.ntust.edu.tw
Objective:
To examine the factor structure of various measurements of trunk muscle performance for healthy subjects.
Design:
A total of 22 performance scores were collected and their univariate and multi-variate relationships were examined.
Background:
Extensive literature exists on the measurement of trunk performance data and the relationships between measurements but what needs to be collected to realize a true performance score remains unclear.
Methods:
Trunk muscle performance scores of 150 subjects (71 males and 79 females) were obtained on an Isostation B-200 Dynamometer. Twenty-two parameters measuring range of motion, isometric strength, velocity, and endurance on all three planes of motion were collected. The factor structures were constructed using Principal Components Analysis.
Results:
Clear-cut factor patterns (explained 96.3% of the total variance) suggests that the five-factor structure might be valid and appropriate for this population. The major loading on each factor indicated that: Factor 1 could be labeled as a static strength measure; Factor 2 as velocity; Factor 3 as flexibility; and Factors 4 and 5 as fatigue-resistance.
Conclusions:
No single mode of measurement can provide a good representation of a total trunk muscle performance. RelevanceFor the realization of trunk muscle performance, clinics have to measure all modes of isometric strength, velocity, range of motion, and endurance. Care must be taken in eliminating any parameter.