GXT lab write up - GXT Lab 1 a see the two attached graphs...

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GXT Lab 3/31/08 1. a. see the two attached graphs b. In looking at the graph of HR versus Power Output, HR increase with power output due to the increased SNS activity, increased circulating catecholamines (norepinephrine and epinephrine) and decreased PNS activity. The increased venous return causes an atrial stretch reflex stimulating the central nervous system to increase HR. During recovery, HR decreases, SNS decreases, PNS activity increases and venous return/stretch reflex are decreased. Series1 line on the BP versus power output graph shows the steady increase in systolicBP with increased power output. The increase in venous return leads to a greater preload, increased myocardial stretch, HR, strength of contraction which all contribute to an increased Q, ultimately increasing the systolicBP. Series3 line on the graph shows diastolicBP increasing with exercise intensity, but remaining relatively constant throughout. DiastolicBP changes little during exercise in normal people, and a
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