I meditate upside down for upwards to 30 min every morning
How long did it take you to work up to this? How do you time yourself to control the length of your inversion to keep it within safe parameters? One often loses track of time while meditating. Do you use an egg timer?
on an empty stomach
I guess this makes sense, since food would get pulled in the direction of the esophagus. However, I think inverting after a meal of heavy food would necessitate a tight contraction of the esophagus muscles to keep it from coming back up again (or from your stomach acid burning it like vomiting) so perhaps it is like bodybuilding for your esophagus. This is interesting since there are obviously no skeletal exercises for such smooth internal muscles.
I also do sit ups inverted with great results.
They do look more challenging in the contracted position, both for the abdominals and the hip flexors. I would still perform them normall on the ground (and the intermediate, the decline bench) as to work them harder in the stretched position, which is also very important. Back bending is also something to consider, as this stretches them even more than being inverted (of course, this does not account for the stretch from spinal traction, which may make up for the indirect angle).
after going on the inversion table I feel like I have just taken the most powerful nootropic possible.
How much better is it compared to the natural high you get from exercising in other ways? I was also wondering, how much do you think is due to inversion, and do you think some of the feeling may be associated with the feeling of spinal traction/decompression/stretching? I can't help but think this is partially responsible. Other forms of inversion that do not decompress the entire spine would be hanging by your arms (shoulders extended not flexed overhead), handstand, and headstand. The first two (not headstand) do decompress the cervical (neck) vertebrae though, so that may be responsible. I expect since it is the region of spine most near the brain it has a larger effect. Also compare it to bar hanging with shoulders flexed (overhead) as this would allow you to view spinal decompression (except for cervical, which is compressed akin to standing) in isolation without the effect of inversion. Comparing these different things with some sort of measurable biofeedback of your described 'nootropic feeling' would be pretty interesting don't you think?
The brain runs 14 percent faster inverted.
I would be interested in this study. I am thinking the effect would tend to vary person to person.
It also makes you taller, more flexible. You feel like you have a new body. Does anyone else here use an inversion table and do you have any advice?
The increase in height is mostly temporary due to decompression of the inter-spinal discs. The flexibility thing may be true, you can do some excellent static-active stretches (a very beneficial form of stretching) while hanging and undergoing traction which can't be done while standing or even lying down. I'm sure it does feel really great to get the weight of the world off your shoulders, even if you must shift it to your anterior tibiliases.