Exercise physiology Flashcards
Ht muscle can use glucose, but normally uses ___, as does skeletal muscle at rest.
free fatty acids
Approx. how long can exercise be sustained utilizing the nonoxidative system?
30 sec - 3 min
Why does the resting heart rate decrease with prolonged exercise programs?
stroke volume increases over time
resting ht rate will decrease to keep CO normal
Following phosphocreatine depletion, muscle switch to the __ breakdown of glycogen to produce lactic acid.
anaerobic
Initial aerobic energy substrates are FFAs and lactate. However, plasma __ also increasingly come to be generated by the liver for muscle consumption.
glucose
T/F: resting heart rate decreases with a prolonged exercise program.
T
During maximal effort rhythmic exercise, systolic blood pressure may exceed __ mmHg.
200
The initial generation of ATP in exercise comes form __, but this source of ATP only lasts for 2-7 seconds following an intense effort.
phosphocreatine (PCr)
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.
20
85
Approx. how long can the phosphagen system provide energy to the working muscles?
approx. 30 seconds during exercise with all-out effort
T/F: chronic aerobic training has little to no impact on maximal heart rate.
T
During sustained submaximal exercise, systolic blood pressure is generally maintained at __ to __ mmHg.
140-160
Plasma volume increases more than erythrocytes, and as a result, relative measures of hemoglobin and hematocrit actually __.
decrease
What happens to the diastolic blood pressure during exercise?
stays the same or decreases slightly
The production of __ significantly increases, leading to greater oxygen-carrying capacity.
erythrocytes
