This chest tightness can change from day to day, and/or from moment to moment. All of the above combinations and variations are common. This type of chest tightness is commonly misconstrued as heart problems or the signs of a heart attack.
Cardiac arrest, also known as cardiopulmonary arrest or circulatory arrest, is a sudden stop in effective blood circulation due to the failure of the heart to contract effectively or at all. Medical personnel may refer to an unexpected cardiac arrest as a sudden cardiac arrest (SCA).
Cardiorespiratory endurance is how our body is able to supply fuel during physical activity via the body's circulatory and respiratory systems. 1  How efficient your heart and lungs are at delivering oxygen to your body. 2  How efficient your body is at creating the ATP, or energy, your muscles need in order to contract.