Long term exposure to soundproof environments may cause a series of changes in a person's physiological state. The following are some possible physiological changes based on existing research and theoretical analysis:
 
1. Changes in the cardiovascular system
 
Long term sound insulation environment may lead to instability of the cardiovascular system. In a quiet environment, a person's heart rate may become irregular and blood pressure may fluctuate. This is because the autonomous nervous system of the human body may experience regulatory imbalance in the absence of external noise stimulation.
 
2. Changes in the nervous system
 
The soundproof environment may have an impact on the human nervous system. In a quiet environment, the human nervous system may become more sensitive and respond more strongly to small external stimuli. In addition, prolonged soundproof environments may lead to neurasthenia, symptoms such as headaches and insomnia.
 
3. Changes in the endocrine system
 
Soundproofing environment may affect the endocrine system of the human body. In a quiet environment, the human body may produce more adrenaline and other stress hormones, which can lead to phenomena such as increased heart rate and elevated blood pressure. In addition, prolonged sound insulation may disrupt the body's biological clock and affect the normal functioning of the endocrine system.
 
4. Changes in the Hearing System
 
Although the main purpose of a soundproof environment is to reduce the impact of noise on hearing, prolonged soundproof environments may also have an impact on the hearing system. In a quiet environment, human hearing may become more sensitive and respond to small sounds. In addition, prolonged soundproof environments may lead to a decrease in hearing adaptability, making it difficult for people to adapt when returning to noisy environments.
 
5. Changes in the immune system
 
Long term soundproof environment may have an impact on the immune system. In a quiet environment, the human body may produce more stress responses, which may weaken the function of the immune system and make people more susceptible to infections.
 
The above is an analysis of the physiological changes that may be caused by long-term sound insulation environment. It should be noted that not everyone will experience these changes, and their occurrence and development may be influenced by various factors such as individual differences and environmental factors.