Surprising Discoveries: How Diving Can Improve Running Performance

Exercising between dives
Exercising between dives

Q: My son and I have been mapping the bottom of a quarry. We did several dives last weekend; each was to about 9m and 45 minutes long. The water was cold, so we decided to run (about 1.5km) around the quarry between dives to get warm. We started running about ten minutes after coming out of the water. To our surprise, we ran much better and were able to breathe more easily than usual. I understand it may be inadvisable to exercise too soon after diving, but I wondered if you could explain why we found breathing while running so much easier after diving. It was a complete surprise to both of us — we thought we’d be sluggish, but just the opposite was true.

A: The factors captured by your question are quite complicated and bridge a number of issues. First, the recommendation against exercise after diving is based on decompression safety.

Vigorous exercise and/or high joint forces can promote bubble formation and increase the risk of decompression injury. The simplest way to visualise this effect is to compare the result of opening a bottle of soft drink that has been at rest and one that was shaken before opening.

The Nature of the Dive Profiles

While avoiding unnecessary exercise after diving is a sound general recommendation, the relatively benign nature of the dive profiles you described make this less critical (Please note that ‘less critical’ does not mean unimportant, just that the exposure you described is not as high on the risk scale as many dives might be.)

Factors Affecting Breathing after Diving

The next consideration is the impact of immersion, breathing equipment and person. The combined effects of a blood shift to the chest (primarily caused by the hydrostatic pressure of water, potentially magnified somewhat by additional cold stress), elevated breathing resistance from the mouthpiece — which can vary substantially depending on body position, depth (due to changing gas density), level of exercise and the characteristics of the regulator itself — state of hydration (being overhydrated can increase the likelihood of respiratory problems) and miscellaneous factors such as age, gender, constrictive equipment and physical fitness can lead to a degree of respiratory compromise after diving.

The Role of Immersion and Respiratory Compromise

If enough of these small factors work together, a swimmer or diver may develop a condition known as immersion pulmonary oedema, in which excess fluid enters the lungs and compromises breathing during or following a dive. The solution is to try to reduce the impact of each element, a goal divers may achieve consciously or unconsciously. Some protection is provided by maintaining a normal pattern of good but not excessive hydration and by maintaining an optimal body position and low-exercise intensity during dives to reduce breathing effort.

The Perception of Ease

Immersion, especially in cold water, can induce some respiratory compromise. Mild impairment may not be noticed postdive because of the more-obvious benefits of removing the regulator, dropping the heavy gear and having to work only against air. I suspect that your sense of ease was more perceptual than actual.

The Importance of Post-Dive Rest

Ultimately, while you may feel good post-dive, the dive has still stressed your system. For this reason, I would discourage strenuous exercise. The postdive period is the right time to take it easy. Establishing a habit of keeping physical effort low after diving may offer important protection since some dives are less benign than others. Think of this as inexpensive insurance for long-term health and safety.

aSKdan
Surprising Discoveries: How Diving Can Improve Running Performance 2

This article was originally published in Scuba Diver UK #74

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@jaketarren
#askmark Heyo!  Been learning about sidemount and I'm having a hard time finding a clear example of how to rig the tanks.  I know it'll be covered in the training, but I need to know what to get before I take the class, there isn't a good sidemount shop near me.

Can you show how sidemount tanks and deco/stage tanks are rigged please?

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@jaketarren
#askmark Heyo! Been learning about sidemount and I'm having a hard time finding a clear example of how to rig the tanks. I know it'll be covered in the training, but I need to know what to get before I take the class, there isn't a good sidemount shop near me.

Can you show how sidemount tanks and deco/stage tanks are rigged please?

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▶️ https://www.youtube.com/watch?v=F7MfATRd5Os
▶️ https://www.youtube.com/watch?v=_Y6wIOKde48

=================================

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Welcome to Scuba Diver Magazine! We’re passionate about everything related to the underwater world. As a free distribution magazine in Europe, ANZ, and North America, we bring you the latest in scuba diving, from epic dive travel destinations and honest gear reviews to expert advice, news, and inspiring underwater stories.

Whether you’re a seasoned diver or just starting your underwater journey, our content is designed to keep you informed, inspired, and ready for your next dive. Get in, explore, and stay connected to the world of scuba diving with us! Join us and never miss an adventure!

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How Do You Rig a Sidemount Cylinder?

@martink72
#askmark How do I attach a flashing light to my twin or single cylinder so that my buddy can see/find me even in poor visibility or at night? The typical lanyard on these things always let the light fall downwards and obscure it.
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=================================

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Welcome to Scuba Diver Magazine! We’re passionate about everything related to the underwater world. As a free distribution magazine in Europe, ANZ, and North America, we bring you the latest in scuba diving, from epic dive travel destinations and honest gear reviews to expert advice, news, and inspiring underwater stories.

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@martink72
#askmark How do I attach a flashing light to my twin or single cylinder so that my buddy can see/find me even in poor visibility or at night? The typical lanyard on these things always let the light fall downwards and obscure it.
Please visit our website for more Scuba news, underwater photography, hints & advice, and travel reports: https://divernet.com/

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▶️ https://www.youtube.com/watch?v=_Y6wIOKde48

=================================

✅ About Scuba Diver Magazine.

Welcome to Scuba Diver Magazine! We’re passionate about everything related to the underwater world. As a free distribution magazine in Europe, ANZ, and North America, we bring you the latest in scuba diving, from epic dive travel destinations and honest gear reviews to expert advice, news, and inspiring underwater stories.

Whether you’re a seasoned diver or just starting your underwater journey, our content is designed to keep you informed, inspired, and ready for your next dive. Get in, explore, and stay connected to the world of scuba diving with us! Join us and never miss an adventure!

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