[Lipid peroxidation and antioxidative system in imitation diving]

Area of Science:

• Physiology
• Biochemistry
• Hyperbaric Medicine

Background:

• Understanding the physiological impact of deep diving is crucial for diver safety.
• Lipid oxidation (LPO) and the body's antioxidant defenses are key factors in physiological stress responses.

Purpose of the Study:

• To investigate the effects of simulated deep diving on plasma lipid oxidation and the antioxidative system.
• To determine the relationship between iron levels, LPO products, and antioxidant mechanisms under hyperbaric conditions.

Main Methods:

• Analysis of plasma lipid oxidation products (primary and secondary).
• Measurement of iron levels and key components of the antioxidative system (ceruloplasmin-transferrin).
• Simulated diving in a pressure chamber to 250 meters.

Main Results:

• Simulated deep diving led to elevated iron levels in test divers.
• A subsequent increase in primary LPO products was observed.
• No significant rise in secondary LPO products was detected, suggesting protective mechanisms.

Conclusions:

• The ceruloplasmin-transferrin system appears to mitigate iron-induced LPO during simulated deep dives.
• Antioxidant systems effectively inactivated reactive species, preventing secondary LPO product accumulation.
• These findings highlight the adaptive capacity of the antioxidative system under extreme hyperbaric stress.