The study examined the effectiveness of verbal feedback from a second rescuer ("human feedback") versus mechanical feedback from a device during CPR training among medical students.
The "human feedback" group performed as well as the "mechanical feedback" group in terms of CPR quality but was quicker to start compressions and made fewer errors in decompression.
However, the "human feedback" group experienced more absolute hands-off time, suggesting a need for further investigation into optimizing human feedback training for CPR.