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(A–E) Dynamic exercise; trajectories A–E. External black octagon: corresponds to the patients’ current maximum active cervical range of motion (ACROM); internal grey octagon: Calculation basis for training units varying between 30% and 90% of the current ACROM; green line: target specification by software (globe in the virtual scene); red line: Actual curve performed by the patient (white circle in the virtual scene) using head movements.
