Physiological changes refer to alterations in the functioning of the body and its systems in response to various internal and external stimuli. This research area focuses on the study of how different factors such as stress, exercise, nutrition, and illness can impact the body's physiological processes. Researchers in this field examine changes in things like heart rate, blood pressure, hormone levels, and metabolic function to understand how the body responds to different stimuli and how these responses may influence overall health and well-being. Studying physiological changes can help researchers better understand the mechanisms underlying various health conditions and develop more effective interventions and treatments.