Performance Metrics From Product-Oriented Measures of Fundamental Motor Skills-A Comparison and Developmental Perspective.

This study (a) examined the associations among different performance metrics derived from different strategies (i.e., maximum and average scores) and trials from product-oriented measures of motor skills, and (b) explored how different performance metrics from product-oriented assessments of motor skills change in young children with typical development. Children ( = 279; 156 girls; = 4.44 years) completed a battery of product-oriented assessments for throwing (in meters per second, five trials); kicking (in meters per second, five trials); jumping (in centimeters, five trials); running (in meters per second, two trials); and hopping (in meters per second, four trials-two preferred foot, two nonpreferred foot). A total of 36 performance metrics were derived-throw ( = 7), kick ( = 7), jump ( = 7), run ( = 4), and hop ( = 11). Intraclass correlations examined reliability among performance metrics for each skill; linear mixed models examined whether variations changed across early childhood. There was excellent reliability among all performance metrics for each skill (all ICC> .90). Linear mixed models revealed that children's motor performance improved for two metrics of the throw, five variations of the jump, and three metrics of the hop (all <.05). Researchers should be aware that some performance metrics from product-oriented assessments (e.g., maximum and average of three or five trials) are highly related and change, whereas others do not.