How stress affect vital capacity?

Stress can negatively impact vital capacity by causing physiological changes in the body, such as muscle tension and shallow breathing. During stressful situations, the body's fight-or-flight response may lead to rapid, shallow breaths instead of deep, diaphragmatic breathing, which can reduce lung expansion and overall vital capacity. Chronic stress may also contribute to respiratory issues, further diminishing lung function. Thus, managing stress through relaxation techniques can help improve respiratory health and vital capacity.