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Figure 25-7Cardiovascular response to exercise ±CO >4x ±proportion >4x ±blood (liters/min) to skeletal muscles ~20x cause of proportion shift: vasodilation in skeletal muscles vasoconstriction elsewhere
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Limitations to athletic performance •oxygen delivery to muscles by blood •oxygen delivery to blood by lungs •oxygen use by muscle cells •force production by muscle cells ventilation reaches 65% of max. when cardiac output reaches 90% of max (so cardio system sets limit before ventilation system)