title: Intraindividual variability in development of accuracy of motor performance.
abstract: Age trends in children's ball-rolling accuracy were investigated with a concentration on intraindividual variability. The subjects were boys and girls (n =20 each) who were randomly selected from each of seven groupings representing ages 5 to 11 yr. Significant reduction in mean constant error occurred with increasing age for both sexes, and the boys performance was superior to that of the girls' across ages. The concept of modification of performance toward less variability was supported by significant reduction of mean intraindividual variance with age; however, the sex difference in mean intraindividual variance (greater consistency in boys' performance) was not constant over age. The results are discussed in relation to speculated cultural influences, and consideration is given to the importance of examining intraindividual variance in studies of age trends in motor performance.
authors: a Department of Physical Education , University of Washington.
authors: F L
authors: FL
authors: Smoll
authors: P
authors: P
authors: Den Otter