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[Human sympathetic-adrenal system during water immersion]
Kosmicheskaia Biologiia I Aviakosmicheskaia Meditsina
|September 1, 1981
Summary
Water immersion alters the sympathoadrenal system (SAS), boosting hormonal activity while reducing transmitter function. Subsequent acceleration exposure enhanced SAS activity, improving tolerance to immersion.
Area of Science:
- Physiology
- Environmental Medicine
- Human Performance
Background:
- The sympathoadrenal system (SAS) plays a crucial role in physiological responses to stress.
- Understanding SAS activity during environmental challenges like water immersion and acceleration is vital for human performance and safety.
Purpose of the Study:
- To investigate the effects of prolonged water immersion on SAS activity.
- To examine the combined effects of water immersion and acceleration on SAS function.
- To determine if SAS stimulation can enhance tolerance to water immersion.
Main Methods:
- Studied 12 healthy volunteers undergoing 7 days of water immersion.
- Measured SAS hormonal and transmitter activity before and after immersion.
- Exposed six subjects to +3 Gz acceleration for 15 minutes before and after immersion.
Main Results:
- Water immersion led to increased SAS hormonal activity.
- Water immersion resulted in decreased SAS transmitter activity.
- Acceleration exposure stimulated the SAS, enhancing tolerance to water immersion.
Conclusions:
- Prolonged water immersion significantly modifies SAS activity, with distinct changes in hormonal and transmitter functions.
- Acceleration exposure acts as a stimulus to the SAS, counteracting some immersion-induced effects.
- SAS stimulation appears to be a key factor in improving tolerance to water immersion, suggesting potential applications in training or countermeasures.