Motor Control

Document Type



The objective of this study was to explore the differences of postural stability and Anticipatory Postural Adjustments (APAs) performances after general muscle fatigue between trained and untrained adults. The displacements of Center of Pressure (COP) during static bipedal standing, the APAs of deep trunk muscles induced by voluntary movements, the Heart Rate (HR) and the Borg Rating of Perceived Exertion Scale (RPE) were recorded before and after a 20-minute general muscle fatigue on a rowing ergometer for eighteen trained and eighteen untrained subjects. After fatigue, the trained group exhibited less disturbed postural stability performances. Meanwhile, earlier and larger APAs activations of lumbar multifidus (LMF) were found in trained group regardless of fatigue conditions. These results suggest a beneficial effect of long-term training experience on counter-perturbation feedforward control and highlight the distinguishing role of LMF in evaluation and rehabilitation of motor dysfunction.