Any suggestion for interesting clinical physiology test/effect?

My group has to decide on any topic related to human physiology to experiment the hypothesis using lab techniques that can measure heart rate, ECG, EEG. respiratory function, etc. Things we've done are things such as diving reflex, Valsalva maneuver, Cold Pressor test, Fitness experiment, etc. Do you know any interesting and simple physiological effect or clinical test that we can simply measure and test within a college lab setting?? The simpler the better! Thanks y'all.

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Answers:

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Oculocardiac reflex is simple in terms of the testing. Eyeball pressure => slowed heart rate but the pathway involved are interesting.

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