Charlie Morley Interview: Where are the studies he mentions?

Hello everyone!

I was blown away by some date Charlie Morley drop on the interview with Andrew. He mentioned that people’s respiration rate has increased dramatically over the last decades. I really like the topic, but there was no way to find to which studies or sources he is referring to, I’ve been googling a lot but…nothing. Any idea how to find that research on history on respiration rates?
Thanks

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You can check his latest book "Wake up to Sleep" which seems to have a lot of documentation or alternatively, Breath, by James Nestor, which cites a lot of research and historical data. I actually liked the audiobook better.