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NPLEX - Physiology > Exercise physiology > Flashcards

Flashcards in Exercise physiology Deck (15)
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1
Q

Ht muscle can use glucose, but normally uses ___, as does skeletal muscle at rest.

A

free fatty acids

2
Q

Approx. how long can exercise be sustained utilizing the nonoxidative system?

A

30 sec - 3 min

3
Q

Why does the resting heart rate decrease with prolonged exercise programs?

A

stroke volume increases over time

resting ht rate will decrease to keep CO normal

4
Q

Following phosphocreatine depletion, muscle switch to the __ breakdown of glycogen to produce lactic acid.

A

anaerobic

5
Q

Initial aerobic energy substrates are FFAs and lactate. However, plasma __ also increasingly come to be generated by the liver for muscle consumption.

A

glucose

6
Q

T/F: resting heart rate decreases with a prolonged exercise program.

A

T

7
Q

During maximal effort rhythmic exercise, systolic blood pressure may exceed __ mmHg.

A

200

8
Q

The initial generation of ATP in exercise comes form __, but this source of ATP only lasts for 2-7 seconds following an intense effort.

A

phosphocreatine (PCr)

9
Q

At rest, only __% of CO is directed toward muscle, but during high-intensity exercise as much as __% of the blood ejected from the heart may be delivered to skeletal muscles.

A

20

85

10
Q

Approx. how long can the phosphagen system provide energy to the working muscles?

A

approx. 30 seconds during exercise with all-out effort

11
Q

T/F: chronic aerobic training has little to no impact on maximal heart rate.

A

T

12
Q

During sustained submaximal exercise, systolic blood pressure is generally maintained at __ to __ mmHg.

A

140-160

13
Q

Plasma volume increases more than erythrocytes, and as a result, relative measures of hemoglobin and hematocrit actually __.

A

decrease

14
Q

What happens to the diastolic blood pressure during exercise?

A

stays the same or decreases slightly

15
Q

The production of __ significantly increases, leading to greater oxygen-carrying capacity.

A

erythrocytes