Number of muscle capillaries, volume of a stroke, muscle blood flow, and red blood cell volume are all factors that affect a muscle cell's ability to extract.
Heartbeat rate: One's VO2 max is typically most severely constrained by this. To fulfill the body's increased oxygen demands during exercise, cardiac output rises. Exercise causes a linear rise in the heart's heart rate and stroke volume.
Each discipline calls for the utilization of distinct muscle groups, and VO2 max measures the capacity of a particular set of muscles to supply aerobic energy at any given time.
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