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this post was submitted on 17 Sep 2023
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Asklemmy
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This is the most important fact I have ever learned.
But is there any benefit to exercise?
Not sure, it wasn't very clear from the comment.
Just adding some sauce for the weird cult like talk: https://www.pnas.org/doi/10.1073/pnas.1015950108
Excuse me what do you think is cult like about that?
It straight up reads like cult craziness or crazy 2 am infomercials. HEAD ON! APPLY DIRECTLY TO FOREHEAD! I'm glad you've placebo'd yourself into happiness though lol.
You said Exercise grows your hippocampus in 4 different bullet points lmfao. Great, it increases size by 2%. It proves nothing about whether it affects depression in adults. In fact, the studies show they do jack shit except help memory lol.
More showing it means little to nothing:
https://www.sciencedirect.com/science/article/pii/S1053811917309138
https://www.frontiersin.org/articles/10.3389/fphys.2017.00085/full
So it’s right there in the results you quoted:
Apparently it simultaneously shrinks your right hippocampus while growing your left, for an average change of zero while the left grows?
That’s the only way that sentence makes sense.
I read that as “the hippocampus shrinks at a rate of [x] [y]s per [z]. Exercise slows that shrinking in the left hippocampus.”
Agreed.
I wonder if it would “regenerate” an atrophied or shrunken hippocampus. Like the way rest and nutrition won’t make your skin larger but it will heal missing patches of skin.
I know I’ve seen claims from reputable sources that exercise raised BDNF levels, and that BDNF leads to hippocampal neurogenesis. I can find the sources again I’m sure if you’d like; let me know.
But how could hippocampal neurogenesis be happening without volume change? Could it be replacing dead cells (and preventing shrinkage)? Packing neurons in more densely?
Okay so it’s not making anything grow. Yeah that’s probably it.
Though that is still an effect on hippocampal volume.
Maybe they meant to say something like:
“Overall exercise doesn’t affect hippocampal volume, except in cases the hippocampus is actively shrinking in which case it can slow down the left side” (and reading between the lines possibly on the right side with a p value a little higher than significant?)
Oh you noticed the repetition did you?
So hang on. Are you trying to tell me that exercise grows the hippocampus?
What do you mean by "in a dose dependent way"?
I think it means more exercise leads to more growth.
So does meditation according to my psychiatrist
Apparently it also increases the feeling of needing to repeat yourself 🤔