Observation of others’ actions during limb immobilization prevents the subsequent decay of motor performance

Significance In several clinical conditions, especially those related to orthopedic trauma or specific injuries of the peripheral nervous system, patients may experience a period of limb nonuse that has detrimental cascade effects on corticomotor organization and ultimately, on motor performance. During limb nonuse, treatments based on action observation may be suitable for stimulating the motor system via the mirror mechanism. Using short-term immobilization in healthy volunteers, our study showed that administering action observation during immobilization limits the movement alterations induced by limb nonuse. Given action observation’s protective role against the decline of motor performance, it represents a valid tool for early interventions during limb nonuse, thus reducing the burden of further motor rehabilitation.