exercise phys I (18)

Question 1

in the average adult, in good health at rest, what does 1 met equal in terms of volume of oxygen consumed?

Answer 1

VO2: 250 mL/min or 3.5 ml/min/kg= 1 met

Question 2

in CHO oxidation what is the
kcal/gm
RQ
kcal/L O2

Answer 2

4 kcal/grm.
R.Q is 1.0
kcal/L O2 is 5.05

Question 3

in PTN oxidation what is the
kcal/gm
RQ
kcal/L O2

Answer 3

4 kcal/grm
R.Q. is 0.8
kcal/L O2 is 4.5

Question 4

in fat oxidation what is the
kcal/gm
RQ
kcal/L O2

Answer 4

9.1 kcal/grm
R.Q. is 0.7
kcal/L O2 is 4.70

Question 5

what would an non-protein RQ of 1.0 indicate about the person’s diet?

Answer 5

that they were consuming 100% CHO

Question 6

what would an non-protein RQ of 0.7 indicate about the person’s diet?

Answer 6

that they were consuming 100% fat

Question 7

when does RER= RQ

Answer 7

whenever the body’s total O2 content stays constant (usual) AND when total CO2 content stays constant (variable depending on breathing strategies)

Question 8

what is a convenient conversion for kcals to liters of O2?

Answer 8

5.0 kcals/ liter of O2

Question 9

what is the approx conversion for mets to kcal?

Answer 9

1 met= 1 kcal/kg/hour

Question 10

what value is considered to be the best indicator for aerobic fitness or endurance performance?

Answer 10

Max VO2

Question 11

what are “supramaximal rates”?

Answer 11

exceeding the max but with no increase in VO2, this depends on anaerobic metabolism and this does not last very long-quickly fatiguable

Question 12

give me 3 things that limit VO2 max

Answer 12

1. pulmonary factors
2. cardiac factors
3. muscle factors

Question 13

with increasing VO2, what will HR do?

Answer 13

increase as well

Question 14

describe stroke volume with increasing VO2

Answer 14

Stroke volume increases initially at mild to moderate exercise intensities and then levels off or may even decline slightly at higher work rates

Question 15

Why does SV fail to increase further during heavy exercise

Answer 15

because heavy exercise–>increased HR–>decreased ventricle filling time

Question 16

the arterial-venous O2 difference widens with progressively increasing exercise- why? (3)

Answer 16

1. better capillary perfusion
2. a decreased myocyte PO2
3. a right shift in the oxygen-HgB dissociation curve

Question 17

true or falce

the cardio-vascular system limits VO2 max

Answer 17

true

VO2 max appears the be limited by ventricular output (cardiac output)

Question 18

true or false

skeletal muscle consumption limits VO2 max

Answer 18

false

except in highly de-conditioned individuals

Question 19

what are 4 things reguarding exercise that affect BP?

Answer 19

1. the muscle being used
2. static or dynamic exercise
3. body position
4. body temp

Question 20

what does MAP increase during arm work more than during leg work

Answer 20

because during arm (or other small muscle work) the vasodilation occurs in the small muscle being utilized and vasoconstriction in the large muscles not being utilized (so increased resistance in a greater area of the body)

Question 21

static or dynamic? what type of exercise will you see an increase in BP

Answer 21

static exercise

Question 22

valsalva maneuver has what effect on BP

Answer 22

it will exacerbate the BP response