Role of physical activity and perceived adequacy on peak aerobic power in children with developmental coordination...

The purpose of this study was to determine the mediating role of physical activity and perceived adequacy towards physical activity on peak aerobic power (VO(2)peak) in children with developmental coordination disorder. This case-control study involved 61 male and female subjects age 12-13 years with motor impairments and 61 healthy controls matched for age, gender and school location. Subjects were assessed for motor proficiency and classified as probable developmental coordination disorder (p-DCD) or healthy control using the Movement Assessment Battery for Children, 2nd Edition. VO(2)peak was assessed by a progressive exercise test on a cycle ergometer. Perceived adequacy towards physical activity was estimated using the Children's Self-perception of Adequacy and Predilection for Physical Activity scale. Physical activity was monitored for seven days using accelerometry. Children with p-DCD had significantly lower VO(2)peak adjusted for lean mass (48.8±7.2 ml/kg LM/min; p≤0.05) compared to controls (53.1±8.2 ml/kg LM/min). Regression analysis demonstrated that perceived adequacy and physical activity were significant mediators in the relationship between p-DCD and VO(2)peak (R-squared=24.3%). In conclusion, using a stringent laboratory assessment, the current study verifies earlier non laboratory findings, adding low aerobic power, the most important component of cardiorespiratory fitness, to the list of health consequences associated with developmental coordination disorder.