I am a physician, and I know how stroke volume and ejection fraction are relevant when one of my patients has cardiomyopathy or some other reason for a reduced ejection fraction. it can change what meds I give them. my cardiologist colleagues measure and compute these things for me.
I have no idea how personal trainers use this information. one of the trainers will have to chime in to answer how they use this information on a practical level with clients. the personal trainers I know request a letter from a client's personal physician certifying that they are safe to exercise. some exercise physiologists I know might do some modified exercise protocols and compute recovery heart rates to test fitness. but I am not aware that they would use cardiac output in daily practice.
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