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Related Experiment Video

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Author Spotlight: Integrating Alveolar-Capillary Reserve Measurements in Exercise Adaptation and Therapeutic Strategies

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Exercise before scuba diving ameliorates decompression-induced neutrophil activation.

Dennis Madden¹, Stephen R Thom, Tatyana N Milovanova

¹1Department of Physiology, School of Medicine, University of Split, Split, CROATIA; 2Department of Emergency Medicine, University of Maryland, Baltimore, MD; and 3Institute for Environmental Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA.

Medicine and Science in Sports and Exercise

|March 1, 2014

Summary

Pre-dive aerobic exercise (EX) reduced microparticle (MP) elevation and attenuated neutrophil and platelet activation compared to a control dive (CON). Exercise may offer protective benefits during scuba diving by modulating these physiological responses.

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Area of Science:

Physiology
Exercise Science
Diving Medicine

Background:

Scuba diving can induce physiological stress, including the formation of venous gas emboli (VGE) and changes in microparticle (MP) levels.
The impact of pre-dive aerobic exercise on these physiological responses is not fully understood.
Investigating the relationship between VGE, MPs, and exercise is crucial for understanding dive safety.

Purpose of the Study:

To compare physiological responses to a scuba dive preceded by aerobic exercise (EX) versus a non-exercise control dive (CON).
To evaluate the relationship between VGE and MP levels following exercise and control dives.
To hypothesize that exercise alters the quantity and subtype of annexin V-positive MPs and VGE.

Main Methods:

Nineteen divers completed two 18m/41min dives, separated by at least 3 days.
One dive was preceded by 60 minutes of treadmill interval exercise; the other served as a control.
Blood samples and transthoracic echocardiography were used to measure MPs, VGE, and markers of neutrophil and platelet activation at various time points.

Main Results:

VGE levels did not differ significantly between dives, but increased at 40 and 80 minutes post-exercise dive.
Microparticles (MP) were significantly lower (approximately 2 times) after the exercise dive compared to the control dive at all time points.
Neutrophil and platelet activation markers were elevated by both dives, but these elevations were reduced in the exercise dive.

Conclusions:

Pre-dive aerobic exercise appears to reduce microparticle elevation and attenuate markers of neutrophil and platelet activation.
These findings suggest potential protective benefits of exercise in scuba diving.
Further research is necessary to elucidate the mechanisms and full potential of exercise-induced benefits in divers.