A new study suggests that even after reaching a mastery in a task the overall energy expenditure decreases with even more practice.
link to the science daily article here
“”The message from this study is that in order to perform with less effort, keep on practicing, even after it seems as if the task has been learned,” said the researcher of CU-Boulder’s integrative physiology department. “We have shown there is an advantage to continued practice beyond any visible changes in performance.”
Link to the sciencedaily.com article here