Phys of Exercise Lab Exam 2

How much power is produced when performing an isometric bench press, your subject held a/n 110 pound weight a distance of 0.42 meters off the floor for 0.44 seconds. No units required

0 bc its isometric

When using the hold-relax procedure to try to increase the stretch of a muscle we make use of which of the following reflex phenomena?

Inverse stretch reflex

The following immage depicts the changes in power during a Wingate test. Which of the following are likely related to fatigue during this figure based on its appearance?

PCr depletion

counter movement jump and the no-counter movment jump?

better use of energy return from elastic proteins like elastin and titin

Which of the following would produce the least force?

concentric bicep curl 300 deg /sec

Which of the following would produce the greatest force?

concentric bicep curl 30deg/sec

Which of the following would have the lowest EMG integral with a 15 lb weight?

eccentric bicep curl 30deg/sec

which of the following is/are hormones that would tend to increase glycogenolysis?

epinephrine glucagon

high restistance arm

good leverage and lower emg activity

Which of the following would produce the least force?

knee flexors medium speed

Which of the following is an enzyme that promotes glylcogenolysis?

phosphorylase

which of the following is/are enzymes that would tend to increase blood lactate if their activity increased?

phosphorylase phosphofructokinase

___________________________________ is related to the orderly recruitment of motor units from most aerobic to least aerobic

size principle

counter movement jump and the 0.25m drop jump

the initiation of a stretch reflex

50th percentile BF women/men

22.1/15.9

Myosin heavy chain IIA and Myosin heavy chain IIX would both be found in which fiber type?

IIAX

The following figure depicts EMG and iEMG activity during dynamic bicep curls until the subject could not lift the weight anymore. They lifted the weight 17 times before they fatigued. Which of the following mechanism(s) are most likely to be contributing this fatigue, given this set of data?

a decrease in pH inside the muscle fibers

In one of our lab VII experiments we looked at the effects of intensity on fuel substrate use. Which of the following statements regarding exercise intensity and fuel substrate use is/are NOT true?

at higher intensities the percentage of calories coming from circulating fuel sources increases

Which of the following would require the greatest number of motor units to be recruited?

concentric action with low force arm:resistance arm ratio

Which of the following would have the highest EMG integral with a 20 pound weight at mid flexion (~90degrees)?

concentric action with poor overlap of actin and myosin

Which of the following would produce the least torque?

concentric knee extension 300 deg/sec

Which of the following hormones would tend to inhibit glucose uptake by adipose tissue and muscle (at rest)?

cortisol growth hormone

Which of the following would have the lowest iEMG integral when using a 15 lb weight?

eccentric bicep curl with forearm pronated moving at 60 degrees per second

Which of the following would have the lowest iEMG integral when using a 15 lb weight?

eccentric bicep curl with forearm pronated moving at 90 degrees per second

Which of the following hormones would inhibit muslce protein breakdown? select all that apply

growth hormone insulin

In one of our lab VII experiments we looked at the effects of intensity on fuel substrate use. Which of the following statements regarding exercise intensity and fuel substrate use is/are NOT true?

high intensity exercise decreases insulin secretion, which tends to decrease muscle glycogen breakdown

In one of our lab VII experiments we looked at the effects of intensity on fuel substrate use. Which of the following statements regarding exercise intensity and fuel substrate use is/are NOT true?

high intensity exercise is associated with greater recruitment of slow twitch fibers, which tends to increase carbohydrate use at higher intensities the percentage of calories coming from circulating fatty acids increases

Which of the following enzymes would tend to increase triglyceride breakdow in adipose tissue?

hormone sensative lipase

Which of the following enzymes would tend to increase circulating fatty acids?

hormone sensitive lipase

which of the following is/are hormones that would tend to increase glycogenesis?

insulin

Which of the following would increase muscle glucose uptake? select all that apply

insulin muscularr activity/exercise

When using the hold-relax with agonist contraction procedure to try to increase the stretch of a muscle we make use of which of the following reflex phenomena?

inverse stretch reflex and reciprocal inhibition

Which of the following would produce the most torque?

isokinetic knee extension mid-extension (125-135 deg)

Which of the following would require the least number of motor units to be recruited when using a 15 lb weight?

isometric action with high force arm:resistance arm ratio

If the weather report (or your sling psychrometer) say that the wet bulb temperature was 62F and the dry bulb temperature was 75F. The temperature in the lab was 22C (75F), the subject's core temperature was 37.1C, and their skin temperature was 34.4. Which of the following are true about the humidity under these circumstances?

neither

Which of the following hormones would tend to increase blood glucose? select all that apply

norepinephrine glucagon growth hormone cortisol epinephrine

Which of the following hormones would increase gluconeogenesis in the liver? select all that apply

norepinephrine cortisol epinephrine glucagon

Which of the following hormones would tend to increase liver glycogenolysis?

norepinephrine epinephrine glucagon

If the weather report (or your sling psychrometer) say that the wet bulb temperature was 45F and the dry bulb temperature was 67F, and your subject's core temperature was 37.1C, and their skin temperature was 33.2. Which of the following are true about the humidity under these circumstances?

there is low humidity

Which of the following isokinetic actions would have the highest EMG integral?

they would all be about the same

Which of the following hormones would increase gluconeogenesis in adipose tissue? select all that apply

this process doesn't occur in this tissue

If you were performing a hold relax with agonist contraction PNF procedure to try to improve hamstring flexibility, which of the following muscles/muscle groups would we contract as a part of this procedure?

two (quads and gastroc because its hold relax and agonist)