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These results suggest that the intensity and muscle strength components as developed in this study measure the same underlying construct and that mechanical strain component and the turning actions component were to distinctive, additional factors.
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The muscle strength component score was developed and validated against actual measurements of muscle strength.
The muscle strength component indicates the amount of required lower body muscle strength to perform an activity.
First, the validity of the developed muscle strength component score was assessed in the subsample by concurrent and construct validity.
However, construct validity was limited because of the high correlation of the muscle strength component score as well as the intensity component score with measured muscle strength.
Concurrent and construct validity of the muscle strength component score were investigated using measured quadriceps and handgrip strength (Tables 3 and 4).
Because no score was available for the muscle strength component we constructed and validated this component for the purpose of this study.
This implies that future analyses should contain either the muscle strength component or the intensity component, or a combined average score.
This was confirmed by the results of the factor analysis, showing that the intensity component and the muscle strength component loaded on a single factor.
The correlations of the actual strength measurements with the intensity, mechanical strain and turning action component scores would have to be lower to indicate construct validity of the muscle strength component.
A Spearman's correlation coefficient of at least 0.30 between the developed muscle strength component score and actual quadriceps and handgrip strength measurements would indicate medium concurrent validity [ 32].
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