Our endurance is determined by how a lot physique fat now we have (normally not an issue!), our provide of the enzymes necessary to metabolize the fat, and our provide of mitochondria - where the enzymes metabolize the fats -within our muscles. We develop enzymes and mitochondria through long, slower rides. glycogen-burning: at a average, conversational tempo, we're riding aerobically and metabolizing each body fats and glycogen from stores in our muscles and liver. A well-conditioned rider can retailer roughly 400 - 500 grams (1,600 to 2,000 calories) of glycogen. His or her endurance is restricted by this store of fuel in addition to the provision of the specific enzymes essential to metabolize glycogen aerobically. The supply of enzymes might be elevated by means of aerobic training and, of course, the store of glycogen may be replenished by consuming carbohydrates whereas riding. anaerobic glycogen-burning: at excessive intensities, when we are respiratory laborious, we aren't taking in sufficient oxygen to metabolize fat and glycogen aerobically.
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