The effect of a 10-week physical training program (three sessions of two hours weekly) on the physical work capacity and efficiency of physically handicapped children aged 8 to 14 years were examined. The relationship of oxygen uptake to heart rate and to workload was determined before and after the end of the training program. After the training program a significant decrease in V02 at different workloads was found. No effect of training on the relationship of oxygen uptake and heart rate was found. The implication of this study is that the children can perform the same amount of external work after training as before training but with a lower expenditure of aerobic energy.