24
" At three hundred feet, we are profoundly changed. The pressure at these depths is nine times that of the surface. The organs collapse. The heart beats at a quarter of its normal rate, slower than the rate of a person in a coma. Senses disappear. The brain enters a dream state. At six hundred feet down, the ocean’s pressure—some eighteen times that of the surface—is too extreme for most human bodies to withstand. Few freedivers have ever attempted dives to this depth; fewer have survived. Where humans can’t go, other animals can. Sharks, which can dive below six hundred and fifty feet, and much deeper, rely on senses beyond the ones we know. Among them is magnetoreception, an attunement to the magnetic pulses of the Earth’s molten core. Research suggests that humans have this ability and likely used it to navigate across the oceans and trackless deserts for thousands of years. Eight hundred feet down appears to be the absolute limit of the human body. "
― James Nestor , Deep: Freediving, Renegade Science, and What the Ocean Tells Us about Ourselves
26
" Balloon sinuplasty, as it’s commonly called, creates more space for mucus and infection to pass out, and air and mucus to pass in. In one unpublished case-control study, Nayak found that, of the 28 selected sinusitis patients who received the procedure, 23 needed no other treatment. Sometimes the nostrils are the problem, not the sinuses. Nostrils that are too small or that collapse too easily during an inhale can inhibit the free flow of air and contribute to breathing problems. This condition is so common that researchers have an official name for it, “nasal valve collapse,” and an official measurement, called the Cottle’s maneuver. It involves placing an index finger on the side of one or both nostrils and gently pulling each cheek outward, lightly spreading the nostrils open. If doing this improves the ease of nasal inhales, there’s a chance that the nostrils are too small or thin. "
― James Nestor , Breath: The New Science of a Lost Art
31
" Breathhold Walking Anders Olsson uses this technique to increase carbon dioxide and, thus, increase circulation in his body. It’s not much fun, but the benefits, Olsson told me, are many. Go to a grassy park, beach, or anywhere else where the ground is soft. Exhale all the breath, then walk slowly, counting each step. Once you feel a powerful sense of air hunger, stop counting and take a few very calm breaths through the nose while still walking. Breathe normally for at least a minute, then repeat the sequence. The more you practice this technique, the higher the count. Olsson’s record is 130 steps; mine is about a third of that. 4-7-8 Breathing This technique, made famous by Dr. Andrew Weil, places the body into a state of deep relaxation. I use it on long flights to help fall asleep. Take a breath in, then exhale through your mouth with a whoosh sound. Close the mouth and inhale quietly through your nose to a mental count of four. Hold for a count of seven. Exhale completely through your mouth, with a whoosh, to the count of eight. Repeat this cycle for at least four breaths. "
― James Nestor , Breath: The New Science of a Lost Art
32
" Lie down every day, pacify your mind, cut off thoughts and block the breath. Close your fists, inhale through your nose, and exhale through your mouth. Do not let the breathing be audible. Let it be most subtle and fine. When the breath is full, block it. The blocking (of the breath) will make the soles of your feet perspire. Count one hundred times “one and two.” After blocking the breath to the extreme, exhale it subtly. Inhale a little more and block (the breath) again. If (you feel) hot, exhale with “Ho.” If (you feel) cold, blow the breath out and exhale it with (the sound) “Ch’ui.” If you can breathe (like this) and count to one thousand (when blocking), then you will need neither grains nor medicine. "
― James Nestor , Breath: The New Science of a Lost Art
34
" In school, when I was young, teachers walked around the classroom, man, and pop-pop-pop.” He smacks the back of his own head for emphasis. “You’re breathing from your mouth, you get pop,” he says. Mouthbreathing leads to sickness and is disrespectful, he told me, which is why he and everyone else he grew up with in Puebla, Mexico, learned to breathe through the nose. "
― James Nestor , Breath: The New Science of a Lost Art
35
" In a world of seven billion people, where every inch of land has been mapped, much of it developed, and too much of it destroyed, the sea remains the final unseen, untouched, and undiscovered wilderness, the planet’s last great frontier. "
― James Nestor , Deep: Freediving, Renegade Science, and What the Ocean Tells Us about Ourselves