Identifying Dimensions of Physical (Motor) Functional Capacity in Healthy Older Adults

This study addressed the dimensionality and construct validity of physical functional capacity within the context of performance-based measures. Sixty-two individuals (M= 70yrs), classified as "healthy" based on several screening procedures, completed a battery of standard neuromuscular and physical performance tests. Scores were submitted to a principal components factor analysis to examine and describe potential dimensions of physical functional capacity. Orthogonal and oblique rotations of axes were performed. Six interpretable and meaningful factors were extracted from the orthogonal rotation and identified as strength, unimanual dexterity, mobility/agility, static balance, general upper-extremity control, and movement planning speed. The results indicated that physical functioning in older persons is a multidimensional construct. Moreover, assessment techniques involving performance-based measures should be designed to diagnose physical functional status in separate motor dimensions and plan intervention approaches accordingly.