12 May '16, 1pm

Find yourself breathing more heavily at the start of runs? Here's why:

Find yourself breathing more heavily at the start of runs? Here's why:

Does your breathing seem heavier at the start than in the middle or at the end of your run? Fear not. The body is an integrated system that kicks into gear as you start your run and increase the oxygen demands of your muscles. The regulation system increases your heart rate to pump more oxygen carrying blood to the working muscles and your respiratory rate to exchange more oxygen and carbon dioxide between the blood and air. When you're not exercising, the muscle that does most of the work is the diaphragm, located below the lung cavity and above the abdominal cavity. As the diaphragm contracts, air is sucked into the lungs. As you begin to exercise, the accessory muscles of breathing become more active, lifting the rib cage up to create more suction and increasing the amount of air that is available to exchange. This complements the work of the diaphragm and contributes t...

Full article: http://www.runnersworld.co.uk/training/is-heavy-breathing...

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