Upper UTIs are infections of the kidneys. These are potentially life threatening, if bacteria move from the infected kidney into the blood. This condition is called sepsis. Sepsis can cause dangerously low blood pressures, shock, and death.
So whe you hold your breath, you stop getting oxygen in your lungs that go to your heart. The oxygen level in the blood drops, so your muscles need more oxygen, so the heart pumps faster. This is like running, your muscles need more oxygen so heart pumps faster
How Posture Affects Breath Support. 1  Increases Breath Capacity: The goal of good posture is to create the largest space possible in your chest cavity so your lungs can expand fully. 2  With more air, you are able to sing longer phrases.