摘要：Background Redundant training and feedback are crucial for successful acquisition of skills in simulation trainings. It is still unclear how or how much feedback should best be delivered to maximize its effect, and how learners’ activity and feedback are optimally blended. To determine the influence of high- versus low-frequency expert feedback on the learning curve of students’ clinical procedural skill acquisition in a prospective randomized study. Methods N = 47 medical students were trained to insert a nasogastric tube in a mannequin, including structured feedback in the initial instruction phase at the beginning of the training (T1), and either additional repetitive feedback after each of their five subsequent repetitions (high-frequency feedback group, HFF group; N = 23) or additional feedback on just one occasion, after the fifth repetition only (low-frequency feedback group, LFF group; N = 24). We assessed a) task-specific clinical skill performance and b) global procedural performance (five items of the Integrated Procedural Performance Instrument (IPPI); on the basis of expert-rated videotapes at the beginning of the training (T1) and during the final, sixth trial (T2). Results The two study groups did not differ regarding their baseline data. The calculated ANOVA for task-specific clinical skill performance with the between-subject factor ‘Group’ (HFF vs. LFF) and within-subject factors ‘Time’ (T1 vs. T2) turned out not to be significant (p < .147). An exploratory post-hoc analyses revealed a trend towards a superior performance of HFF compared to LFF after the training (T2; p < .093), whereas both groups did not differ at the beginning (T1; p < .851). The smoothness of the procedure assessed as global procedural performance, was superior in HFF compared to LFF after the training (T2; p < .004), whereas groups did not differ at the beginning (T1; p < .941). Conclusion Deliberate practice with both high- and low-frequency intermittent feedback results in a strong improvement of students’ early procedural skill acquisition. High-frequency intermittent feedback, however, results in even better and smoother performance. We discuss the potential role of the cognitive workload on the results. We advocate a thoughtful allocation of tutor resources to future skills training.
