Short, shallow breathing decreases oxygen intake. Deep breathing leads to an increased oxygen intake, which reduces the work load of the heart and lowers the heart rate and blood pressure. Breathing deeply also helps improve endurance and delay fatigue by slowing the buildup of certain waste products in your muscles.
a) Deep breathing increases heart rate and blood pressure, decreases endurance, and accelerates fatigue.
b) Deep breathing has no effect on heart rate, blood pressure, endurance, or fatigue.
c) Deep breathing decreases heart rate and blood pressure, increases endurance, and delays fatigue.
d) Deep breathing decreases heart rate and blood pressure, but has no effect on endurance or fatigue.
