Studies relying on questionnaires about physical activity show no association with dementia risk, contrasting with studies that objectively measure cardiorespiratory fitness.

“but then you'll like look at another perspective study same deal where they cut like they they don't come in and get anything measured but they come in for a questionnaire or they get they get a questionnaire every you know whatever it was over the course of like 40 40 or 50 years or something and and it's like there's it's the answer all these questions like oh how often do you jog or bike or do you play tennis or whatever and you look at that study and there's like no association between between physical activity and dementia risk and I'm like hmm like that's interesting because this other study where they're actually measuring something showed a robust reduction uh in dementia risk”