Brian Johnson explains how gravity deprivation damages human health, using astronauts as the extreme case. Astronauts lose 25% of aerobic capacity in one to two weeks, compared to 10% per decade normally. His fix: stand up from sitting every 15 minutes.
Questions this video answers
Approximately 25% lost in 7–14 days
About 10% per decade
Up to ~5% in a month
About 1% per decade
Stand up every 15 minutes for a few seconds
Chapters
Hi, this is Brian. Welcome back to another micro class. This one's on Gravity 101. It's inspired by Sitting Kills Moving Heels by Joan Vernacos, who was the former director of Life sciences at NASA, which means she was responsible for keeping astronauts healthy before, during, and after their space flights. And in this book, she shares with us the fact that when astronauts leave our beautiful planet and exit the gravitational pull of planet Earth.
Hello. Going in a rocket ship.
What happens is crazy. Their health goes down in an extraordinarily quick way. So every single health marker basically is affected negatively by leaving gravity. Here's some crazy stats. So usually it takes a decade to lose 10% of your aerobic capacity.
Right?
You know, every decade, after 20 years old, your aerobic capacity goes down on average by 10%. Astronauts lose 25%, not in a decade, but in seven to 14 days. That's crazy. Bone density. Right. So bone density usually goes down about a percent every decade.
Right again, every decade. Well, guess what?
You go into outer space and you can lose up to 5% in a month.
What?
Crazy. Blood plasma, Same thing. Immune system. Long, long list.
Right.
Basically, leaving gravity erodes your health in.
A very, very quick way.
And the whole point of the book is that when we don't use gravity, that is when we're sitting all day long, we experience similar negative effects. Now, of course, we're not leaving gravity completely, so we don't experience this stuff, but our health erodes and atrophies at a much faster rate than it should. And. And that it would if we use gravity often. Hence, sitting kills moving heels. The easiest, simplest way to work with gravity, by the way, is to simply stand up from your sitting position more often.
If all you did was get up.
Every 15 minutes from your desk, stand up for even just a few seconds, and then sit back down, you would do extraordinarily powerful things to optimize your health and wellbeing. We'll talk about more of those, but that's gravity. Or keep the astronauts in mind as you're sitting in your chair all day long.
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