Exam 2 practice questions

Which of the following would be associated with more glycolysis in the body?

- a decrease in citrate - a decrease in ATP - An increase in ADP - increased recruitment of IIX muscle fibers

Which of the following would be associated with low PFK activity in the body?

- an increase in citrate - A decrease in ADP - An increase in ATP - low intensity exercise

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 phosphorylase activity, which tends to increase carbohydrate use - an increase in ADP concentrations when we go from low to moderate intensity exercise would decrease PFK activity and increase carbohydrate use

Which of the following would are all parts of taking an anterior thigh skinfold measurement?

- pull up and create the fold by pinching everything that is not muscle - the calipers should be placed 1cm away from your fingers - It is taken halfway between the hip and the knee on the right side of the body - the calipers should be halfway between the base and peak of he fold

You are working with a 26 year old young woman who walks somewhat regularly (especially from class to class) but reports no other regulary physical acitivity. She weighs 140 pounds, is 5 feet 7 inches tall, has an estimated VO2max of 27.5 ml/kg.min, a waist to hip ratio of .82, is 30 percent body fat as determined by electrical impedance and is 34 percent body fat based on skinfold measurements. Select the statements below that best reflect her weight status (healthy weight, overweight, obese, or underweight), her health related fitness status (unfit, average fitness, above average fitness) and health risk

- she has a healthy body weight based on her BMI - she is of below average fitness based on her VO2max and percent body fat - based on all available information I would clasify this subject as normal weight, but overfat - she has average health risk based on her BMI and WHR

You are working with a 26 year old physically active young woman. She exercises 20-30 minutes (mostly aerobic activities) 3-4 days during each week and does hour long exercise classes once or twice each weekend (spinning, Yoga, Pilates, aqua aerobics, and others). She weighs 160 pounds, is 5 feet 4 inches tall, has an estimated VO2max of 35 ml/kg.min, a waist to hip ratio of .83, is 24 percent body fat as determined by electrical impedance and is 21 percent body fat based on skinfold measurements. Select the statements below that best reflect her weight status (healthy weight, overweight, obese, or underweight), her health related fitness status (unfit, average fitness, above average fitness) and health risk.

- she is overweight based on her BMI - she has slightly above average health risk based on her BMI and WHR and %body fat - based on all available information I would clasify this subject as slightly overweight - she is of about average fitness based on her VO2max and percent body fat

Which of the following influence the rate of evaporation of sweat from the body during thermal stress?

A, B, and C

Which of the following fiber types would tend to have the least myoglobin?

IIX

Which of the following fiber types would tend to have the lowest capillary density?

IIX

Which of the following fiber types would tend to have the lowest succinate dehydrogenase activity? (SDH catalyzes a step in the citric acid cycle)

IIX

Which of the following statements is/are NOT true?

Radiation, Conduction, Convection, and evaporation are mechansims of heat transfer. At rest humans lose most of their heat by conduction

Which of the following is true when comparing Knee Extensor v. Knee Flexor torque curves from our isokinetic experiments?

The knee extensors (quads) produce a greater peak torque, but a much narrow range in which peak torque is sustained compared to the knee flexors (hamstrings). This is due to the design of the knee extensors which are pennate fibers. Pennate fibers and their short fibers have a high torque output, but very limited range to sustain the torque due to the short 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 have the greatest EMG activity?

concentric bicep curl 30deg/sec

Which of the following would produce the greatest force?

concentric bicep curl 30deg/sec

Which of the following would require the most motor unit recruitment when using a 15 lb weight?

concentric bicep curl with forearm supinated moving at 30 degrees per second

Which of the following would produce the greatest torque?

eccentric knee extension 90 deg/sec (greater deg)

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 fast twitch fibers, which tends to decreases carbohydrate use the absolute number of fat calories burned at low intensities is usually higher than the amount burned during moderate intensity exercise

Which of the following would produce the most torque?

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

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

isometric action with good overlap of actin and myosin

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

isometric action with high force arm:resistance arm ratio

You are the instructor of an exercise physiology lab course. All students enrolled in your course have just performed a Wingate test. One of the subjects you tested was a150 pound female sprinter on the track team. She specializes in the 100m and 4x100m relay. Her best 100m time is 11.79 seconds. For this subject, which of the following Wingate test variables would be highest compared to other females in the class?

relative maximum anaerobic power

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

they would all be about the same

Which of the following would require the most EMG activity?

they would all be the same (all isokinetic)

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?

this is low humidity

If we were using fine wire EMG and observed an increase in EMG frequency when our subject produced more force, this would be evidence of what type of summation?

twitch summation

Which of the following would produce the greatest force?

isometric action with high force arm:resistance arm ratio

Which of the following changes would cause the smallest increase in Torque?

knee flexors going from 300 deg/sec to 30 deg/sec

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

size principle

Which of the following would have the highest EMG activity?

isometric bicep curl with forearm supinated with a 20 lb weight

If the weather report (or your sling psychrometer) say that the wet bulb temperature was 56F 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?

it is neither very humid, nor very dry

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?

it is neither very humid, nor very dry

If the weather report (or your sling psychrometer) say that the wet bulb temperature was 65F and the dry bulb temperature was 67F, and your subject's core temperature was 37.1C, and their skin temperature was 36.2. Which of the following are true about the humidity under these circumstances?

it is very humid

Which of the following changes would cause the biggest increase in Torque?

knee extensors going from 300 deg/sec to 30 deg/sec

Which of the following would produce the greatest force?

knee extensors slow speed

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

eccentric bicep curl 30deg/sec

Which of the following would produce the greatest force?

eccentric bicep curl 30deg/sec

Which of the following would require the least amount of motor unit recruitment with a 15 lb weight?

eccentric bicep curl 30deg/sec

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 (larger degree)

Which of the following would produce the least torque?

eccentric knee extension 30deg/sec

Considering pennate muscles and parallel muscles, which of the following is/are NOT true?

longer fibers are associated with better potential for producing force

Which of the following fiber types would tend to be recruited first?

I

Which of the following fiber types would tend to be the largest diameter fibers in women?

I

Which of the following fiber types would tend to have the greatest succinate dehydrogenase activity? (SDH catalyzes a step in the citric acid cycle)

I

Which of the following fiber types would tend to have the lowest ATPase activity?

I

Which of the following fiber types would tend to have the lowest PFK (phosphofructokinase) activity?

I

Which of the following fiber types would tend to have the lowest amount of glycolytic enzymes?

I

Which of the following fiber types would tend to have the most myoglobin?

I

Which of the following fiber types would tend to store the least glycogen?

I

Which of the following fiber types would tend to be the largest diameter fibers in men?

IIA

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

IIAX

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

IIC

Which of the following fiber types would be easiest to fatigue?

IIX

Which of the following is/are NOT true about the effects of training on fuel substrate choice?

untrained subjects would tend to have more fat stores, and this is the main reason that untrained subjects rely more on fats than trained subjects

Which of the following would have the highest EMG integral with a 20 pound weight?

concentric action with low force arm:resistance arm ratio

Which of the following would have the highest iEMG integral?

concentric action with low force arm:resistance arm ratio

You are the instructor of an exercise physiology lab course. All students enrolled in your course have just performed a Wingate test. One of the subjects you tested was a 105 pound female cross country runner. For this athlete, which variable would you expect to be highest compared to the rest of the class?

fatigue index

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

_ is a strategy the nervous system employs to reduce the liklihood of fatigue by alternating which motor units are being used

asyncrhonous motor unit recruitment