Loading ...which does increase hemoglobin concentration , I believe . In addition , I found out later that I have oversized lungs – back in the day of using photographic plates for lung X-rays , they had to use a second image to get the lower part of my lungs . As a kid growing up next to Lake Huron beaches my friends used to challenge me to see who could swim underwater the farthest . I always won – by a lot , so they would claim that I came up for air along the way . It got worse in high school because they took up smoking . I didn’t . I was also more slender , so hydrodynamic drag was less .
When I was scouting age , I joined the Sea Scouts . In the summer months we met at a ‘shack’ on yacht club property and would dive for bottle caps the Skipper would toss into the water . He once asked me to swim down to the bottom to gather up some … about 20 – 25 feet down . I did , but surfaced with a splitting headache . Sinuses ? I’ll never forget that pain !
Maya-sounds like you were scaling cliffs . The one I did was just a hike on an established trail . Below the ridge bluff was a glacier , so you would bring something waterproof to wrap around like a diaper , then slide down to the lake at the bottom of the bowl – half a mile maybe . Even on the cold surface , the speed and friction were enough to heat one’s backside to a very uncomfortable level – almost a burn .