exercise physiology

Question 1

why does sympathetic nerve activity incr during exercise

Answer 1

because we’re resetting the baroreflex set point to a higher pressure

Question 2

how does the baroreflex maintain BP set point?

Answer 2

by altering TPR and CO

Question 3

when do sympathetic bursts occur?

Answer 3

during diastole

Question 4

what is the central command?

Answer 4

feedforward controller that operates in anticipatory phase of exercise and during exercise

Question 5

what is the end result of the exercise pressor reflex?

Answer 5

incr sympathetic nerve activity

Question 6

vasodilator metabolites in exercise pressor reflex

Answer 6

metaboreflex

Question 7

speed and force of contraction in exercise pressor reflex

Answer 7

mechanoreflex

Question 8

If SNA Increases During Exercise, How Does Blood Flow Increase to Muscle?

Answer 8

functional sympatholysis

Question 9

what is functional sympatholysis?

Answer 9

Metabolic autoregulation overtakes the sympathetic nervous system in controlling blood flow to muscle

Question 10

during exercise, systolic BP ____, diastolic BP____

Answer 10

increases, decreases

Question 11

greater muscle mass engaged = greater _____in TPR

Answer 11

decrease

Question 12

compared to leg exercise, arm exercise has _____HR response, _____perceived exertion

Answer 12

greater, higher

Question 13

what can you estimate VO2max from?

Answer 13

HR

Question 14

why does HR increase with exerciser?

Answer 14

1. vagus withdrawal

2. sympathetic activation

Question 15

is the hypothalmic set point changed during exercise?

Answer 15

no, but it is still regulated

Question 16

relationship b/w skin and muscle during exercise

Answer 16

skin competes with muscle for flow during exercise

Question 17

as you sweat more, there will be ________SV

Answer 17

decreased

Question 18

compensation for decr SV?

Answer 18

incr in HR

Question 19

what is lactate accumulation due to?

Answer 19

reflection of product removal; NOT lack of O2