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What Effect Does Exercise Have on the Amount of Carbon Dioxide You Release?

by
author image Fred DiMenna
Fred DiMenna has been writing professionally since 2000. He has authored research articles published in "Journal of Applied Physiology" and "Respiratory Physiology and Neurobiology," and has also been fitness editor for Chelo Publishing in Manhattan, which publishes fitness magazines including "Exercise for Men Only" and "Natural Bodybuilding and Fitness." DiMenna has a Ph.D. in exercise physiology from the University of Exeter.
What Effect Does Exercise Have on the Amount of Carbon Dioxide You Release?
Two men jogging in the park. Photo Credit Steve Mason/Photodisc/Getty Images

When you exercise, the muscles you use require more energy. When exercise can be sustained, this demand is met primarily by aerobic means. Aerobic energy production in muscles results in increased gas exchange at the lungs, because more oxygen is taken in and more carbon dioxide is released. Your blood transports these metabolic gases to and from your tissues.

Gas Exchange at Rest

Oxygen and carbon dioxide are both present in the atmosphere. Oxygen comprises 20.9 percent of the air you breathe, while carbon dioxide makes up .03 percent. When you breathe, you transfer these metabolic gases between the atmosphere and your blood in your lungs. Oxygen moves into your blood, which transports it to tissues where it liberates energy from foods you have eaten. This results in production of carbon dioxide, which must be removed. At rest, you consume 3.5 milliliters of oxygen per kilogram of body weight each minute to satisfy energy needs. Your muscle fiber type, glycogen content, dietary fat intake, training and blood metabolites all influence how much carbon dioxide you produce in association with this oxygen consumption. The least amount is 0.7 liters for every liter of oxygen if fat is burned exclusively.

Gas Exchange During Exercise

During exercise, your body needs more energy, which means your tissues consume more oxygen than they do at rest. Consuming more oxygen means you will also produce more carbon dioxide because your metabolic rate is elevated. The ratio of carbon dioxide produced per oxygen consumed also increases during exercise because a shift from fat to carbohydrate utilization takes place. At the most challenging work rates, you burn carbohydrates exclusively and produce 1.0 liter of carbon dioxide for every liter of oxygen you consume.

Non-Metabolic Carbon Dioxide

At rest and during moderate exercise, lactic acid will not increase in your muscles because all that is produced is also used. Once you reach more challenging work rates, production exceeds use and the acid enters your blood. To maintain a healthy pH, sodium bicarbonate in your blood buffers most lactic acid by breaking it down to water and carbon dioxide. This results in additional carbon dioxide that must be released by your blood.

Example

When you jog at 6 mph, you require 10.2 times the resting oxygen requirement, or 35.7 milliliters per kg each minute. If this is a very challenging pace. Your muscles will burn carbohydrates exclusively and produce 35.7 milliliters of carbon dioxide per kilogram each minute. This equates to 3 liters of carbon dioxide each minute for a 185 pound person sustaining that pace. The challenging exercise would also result in lactic acid accumulation and subsequent buffering to carbon dioxide. It is not unusual to produce an additional 0.1 liters of carbon dioxide for every liter of oxygen consumed for this reason. This means total carbon dioxide production by a 185 pound person jogging 6 mph could be 3.3 liters per minute.

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