Kinesiology 2230A/B Lecture 5:

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Tour de france requires di erent energy systems on di erent days: tt through mountains, distance days (220k), at races are a sprinters advantage. #1 requirement is being extremely aerobically t. On the at days the sprinters stay in the middle of the pack and duke it out at the very end. They also deal with altitude (less oxygen: mitochondria (aerobic metabolism) and sarcoplasm (where glycolysis takes place) are located directly adjacent to the contractile proteins that use the energy. Pancreas is key to this, in particular the beta cells where insulin is produced. Glut4 is the speci c compound that transports glucose into the cell. During exercise, calcium (which is released) activates the glut4 carriers to enable insulin to do what it does. Calcium is associated with the contractile sequence, without calcium in the cell contraction would not occur. Insulin stimulates the uptake of glucose into skeletal to be stored as substrate for energy production.

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