3 ms·

Here are a couple relevant studies: Resonant breathing biofeedback training for stress reduction among manufacturing operators https://www.ncbi.nlm.nih.gov/pub

• agumonkey 10y ago
  I remember reading a long walk technique from middle east, where they would hold their breath a few seconds on each cycle. Supposed to augment your range significantly. I also found out while trying to hold my breath above 2 minutes, that slowly swinging my shoulders to massage my lungs would delay the feeling of syncopation. Maybe, mayyyybe, because it would help enforce more gaz movement thus exchange.