A colleague and I are interested in using EKG-based biofeedback for a new study. Neither of us has much experience with cardiac measures, so we're looking for equipment recommendations. Specifically, we would like a system that will allow us to detect changes in heart rate and/or PEP following a visual stimulus, which will be used to give onscreen feedback to the participant. We're planning to design our own program, so we'd like to find something that doesn't require us to use the company's proprietary software.
I've seen a lot of people recommending the Firstbeat Bodyguard 2 for EKG, but it looks like that can only be used to collect data offline. Can anyone recommend a good system that could be used for biofeedback?