During the initial low intensity exercise periods during the test, the muscle fibre type most recruited would be:

Question 1

During the initial low intensity exercise periods during the test, the muscle fibre type most recruited would be:

I

IIa

IIx

Question 2

As Bill transitioned from rest to exercise, and from one exercise intensity to the next during the test, there was a slow increase in oxygen uptake, necessitating the involvement of other energy systems to meet the energy demands of exercise. Which energy system contributed most during these transitions?

glycolysis

oxidation of muscle glycogen

creatine phosphate

Question 3

As Bill approached the maximal exercise intensity during the test, all muscle fibre types were recruited. Which one produces the most force/power?

I

IIa

IIx

Question 4

Which muscle fibre type has the highest fatigue resistance/endurance?

I

IIa

IIx

Question 5

During the exercise bouts, the cellular process that used the most ATP during the skeletal muscle contractile cycle was:

restoration of SR calcium stores (SERCA Ca2+ ATPase)

cross-bridge cycling (myosin ATPase)

maintenance of sarcolemmal excitability (Na+/K+ ATPase)

Question 6

The major substrate for muscle metabolism during the exercise bouts at 90-100% Wmax was:

blood glucose

muscle glycogen

muscle triglycerides

Question 7

During the exercise training sessions at 65-75% Wmax, there was a progressive rise in blood glycerol levels over the 60-90 min. This was due to:

decreasing uptake of glycerol from the blood by the liver

progressive conversion of glucose into glycerol via gluconeogenesis

increasing release of glycerol from adipose tissue and muscle due to increased lipolysis

Question 8

Following the 6 weeks of intensified, endurance training, an important muscle adaptation contributing to enhanced performance was:

increased muscle mass

decreased muscle capillary density

enhanced mitochondrial density and oxidative potential

Question 9

Bill completed one of his prolonged training sessions in the morning after an overnight fast and without CHO ingestion, but felt somewhat fatigued towards the end of the session. He attributed this to a low blood glucose level. His blood glucose would have been low because:

the increase in plasma fatty acids inhibited muscle glucose uptake

the brain has a high demand for glucose during exercise

liver glucose output was reduced due to depletion of liver glycogen

Question 10

During exercise at the same absolute power output after the period of endurance training, Bill’s metabolism would be characterized by:

enhanced oxidation of fatty acids, derived from both adipose tissue and intramuscular triglycerides

greater lactate production

increased glucose uptake and oxidation

Дата добавления: 2015-11-04