Balance Under Pressure

Pressure causes strange things to happen to our bodies.  Our bodies desire to maintain balance, and they like the status quo.  However, emotional and psychological stress puts our bodies under internal pressure.  But pressure can occur externally as well.  Changing environments exert varying forces.  Thankfully, our bodies are very adaptable – to a point.  Extreme conditions can damage our body, permanently.

Mount Everest

Scaling Mount Everest is a feat few people dare to attempt and fewer accomplish.  Hurricane-force winds surround the peak and temperatures plummet to -76F in January.  It’s no surprise that many never make it off the mountain.

More than 200 bodies litter the route to the top reminding all that a summit attempt is perilous.  However, in terms of climbing difficulty, Everest is far from the most challenging.  If this is true, then why do so many lose their lives?  Many factors contribute to the dangers but near the top (pun) of the list is the altitude.

Normal atmospheric pressure (atm) at sea level is 760mmHg.  At basecamp on Mount Everest (17,800’), there is half the pressure exerted on the body (0.5atm or 382mmHg).  At the peak (29,035’), there is a third (0.31atm or 235mmHg).  Less pressure denotes less available oxygen (160mmHg available at sea level and only 53mmHg at Everest’s peak).  Thus, at the top of Mount Everest, there is ⅓ of the available oxygen we have at sea level!

Think of it this way:  If your body is a subway train, then the passengers represent oxygen in your blood being transported in the subway cars.  On Mount Everest, there is still the same percentage of oxygen there is at sea level (20.95%), but there is less overall oxygen available.  In other words, there are fewer passengers on the subway train.  Interestingly, your body compensates by speeding up the train to move the decreased number of passengers around faster i.e. respiratory rate and heart rate increases.  As a result, resting is work and climbing is arduous.

Scuba Diving

Contrastingly, when you submerge underwater, atmospheric pressure increases.  At a depth of 33’ in sea water, atmospheric pressure doubles.  Breathing underwater via SCUBA means breathing at a higher ambient (surrounding) pressure.  The higher the pressure, the greater the potential problems.

Greater pressures dissolve more gases.  Inhaled gas gets into the body through the lungs then dissolves into the blood and finally gets delivered to the tissues.  Exhaled gas follows the reverse route.  This cycle occurs flawlessly if the pressure remains constant.  But if the pressure changes too quickly, then the body suffers.

A rapid pressure change can cause gases dissolved in the body to come out of its dissolved form.  If exhaled gas (specifically, nitrogen) comes out of solution before it reaches the lungs, then it forms bubbles.  This phenomenon can make you “sick” and is known as “decompression sickness.”  The same thing happens when you open a can of soda too quickly.

Though the condition was first discovered in 1841, a group of construction workers made the ailment famous when they experienced it in 1870.  During the construction of the Brooklyn Bridge, workers placed caissons (hollow iron tubes) underwater so they could be filled with cement to provide a foundation for the bridge.  The team pumped compressed air into the containers so workers could work seamlessly.  Workers climbed up and down the tubes at will effectively going from low atmospheric pressures to higher pressures.

Unfortunately, because of the rapid pressure changes on the body, workers experienced pain and sometimes paralysis, specifically in their joints.  Unknowingly, gas (nitrogen) in their body had come out of solution and formed bubbles.  This condition became known as “Caisson’s Disease.”  Later, because the bubbles often centered around workers’ backs, many sufferers bent over from the pain.  Because of this malady, Caisson’s Disease became known under its more familiar name, The Bends.

Scuba divers are familiar with this condition.  Charts, computers, and detailed planning are all used to prevent divers from getting “Bent.”  Often, a “safety stop” is scheduled at the end of the dive as a precaution.  During this moment, divers stop ascending around 15 feet and pause.  This “breather” allows the body to adjust to the pressure change and maintain balance.

Conclusion

Our bodies want to maintain homeostasis or balance.  Increased or decreased pressures cause imbalances and may harm our system.  But we can learn from these external stresses.  Our bodies are amazing adjusters, given adequate time.  If the workers on the Brooklyn Bridge knew to climb in and out of the caissons slowly, then they could have avoided sickness.  We should all take our own form of safety stops in life when we find ourselves overwhelmed.  Slowing down and taking a “breather” may prevent us from getting sick and suffering permanently.

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