EXPH 386 EXAM 2 QUESTIONS AND
CORRECT SOLUTIONS MDE-1
The contributions from the various pathways of energy transfer depend
upon: - Ans---intensity of exercise
-duration of exercise
-fitness level of individual
An athlete sprints for 5-8 seconds. What energy system is the athlete
primarily using? - Ans--ATP-CP system (high energy phosphate)
If the athlete sprints and sustains this effort, what energy system
replenishes the ATP? This process results in the production of what
important molecule? - Ans--anaerobic glycolysis; lactic acid
When does blood lactate accumulate and rise in an exponential fashion in a
healthy, untrained adult? - Ans--at about 55% of maximal capacity for
aerobic metabolism
What will cause an increase in the blood lactate threshold? - Ans---genetic
endowment (type of muscle fiber)
- increased capillary density
-increased number and size of mitochondria
- increase in aerobic enzymes and transfer agents
T OR F
Untrained individuals will reach a steady state of O2 consumption more
rapidly than trained individuals - Ans--false
How does one know when a person is exercising at his or her *maximal
oxygen consumption*? - Ans--O2 consumption will plateau and show no
further increase
,Type II (fast-twitch muscle fibers) have the following characteristics: -
Ans---possess a high capability for anaerobic production of ATP during
glycolysis
-activated during all-out exercise
-produce much more lactic acid
Type I (slow-twitch muscle fibers) have the following characteristics: -
Ans--- slow speed of contraction
-numerous, large, mitochondria
- especially good at metabolizing FFAs (free fatty acids)
-primary role is to sustain continuous-endurance types of activities
The oxygen consumed in excess of the resting value after exercise is the -
Ans--O2 debt
T OR F
if exercise was almost all aerobic, 1/2 of the total recovery O2 consumption
is repaid within 30 seconds - Ans--true
What is the main source for reestablishing glycogen levels after exercise? -
Ans--carbohydrates in the diet
T OR F
passive recovery will facilitate more lactate removal than moderate aerobic
recovery - Ans--false
What is the benefit of interval training? - Ans---the overload of a specific
energy systems without too much lactate accumulation
-allows a greater duration of exercise and distance covered
List four difficulties with assessing Max Vo2 - Ans--1) more than 40% of
healthy individuals have difficulty attaining a plateau in Vo2
2) difficulty for patients with cardiovascular disease
3) Many people interpret muscle fatigue as pain and cannot/will not
continue to exhaustion
4) increasing to max exertion can increase for untoward events
, Open circuit spirometry is often utilized: - Ans---when a precise
cardiopulmonary response to a specific therapeutic intervention is required
-when assisting in the development of an appropriate exercise prescription
for cardiac and/or pulmonary rehabilitation
T OR F
An *estimated Max Vo2* is predicted from submaximal tests with either
direct analysis of oxygen consumption of from the relationship between HR
response and rate of work - Ans--false-would be true if it was *predicted*
instead of estimated
T OR F
HR increased linearly with increasing aerobic exercise after SV reaches its
maximal level - Ans--true
List four sources of error in estimating and predicting Max Vo2: - Ans--1)
prediction of HR max by age
2) calibration of cycle ergometer
3) HRSS in each stage
4) accurate measurement of heart rate
Advantages of using a submaximal exercise test include? - Ans---its
relatively inexpensive and requires less equipment, personnel, and medial
supervision
- the tests are generally shorter and easier to perform for the individual
T OR F
direct calorimetry measures energy metabolism by measuring the O2
consumption - Ans--false
What are the percentages of O2, CO2, and N in ambient air? - Ans--20.9%
O2
0.03% CO2
79.04% N
What does "RQ" stand for, and what is the equation used to obtain this
numbers? - Ans--RQ= respiratory quotient
CO2 consumed/O2 produced
CORRECT SOLUTIONS MDE-1
The contributions from the various pathways of energy transfer depend
upon: - Ans---intensity of exercise
-duration of exercise
-fitness level of individual
An athlete sprints for 5-8 seconds. What energy system is the athlete
primarily using? - Ans--ATP-CP system (high energy phosphate)
If the athlete sprints and sustains this effort, what energy system
replenishes the ATP? This process results in the production of what
important molecule? - Ans--anaerobic glycolysis; lactic acid
When does blood lactate accumulate and rise in an exponential fashion in a
healthy, untrained adult? - Ans--at about 55% of maximal capacity for
aerobic metabolism
What will cause an increase in the blood lactate threshold? - Ans---genetic
endowment (type of muscle fiber)
- increased capillary density
-increased number and size of mitochondria
- increase in aerobic enzymes and transfer agents
T OR F
Untrained individuals will reach a steady state of O2 consumption more
rapidly than trained individuals - Ans--false
How does one know when a person is exercising at his or her *maximal
oxygen consumption*? - Ans--O2 consumption will plateau and show no
further increase
,Type II (fast-twitch muscle fibers) have the following characteristics: -
Ans---possess a high capability for anaerobic production of ATP during
glycolysis
-activated during all-out exercise
-produce much more lactic acid
Type I (slow-twitch muscle fibers) have the following characteristics: -
Ans--- slow speed of contraction
-numerous, large, mitochondria
- especially good at metabolizing FFAs (free fatty acids)
-primary role is to sustain continuous-endurance types of activities
The oxygen consumed in excess of the resting value after exercise is the -
Ans--O2 debt
T OR F
if exercise was almost all aerobic, 1/2 of the total recovery O2 consumption
is repaid within 30 seconds - Ans--true
What is the main source for reestablishing glycogen levels after exercise? -
Ans--carbohydrates in the diet
T OR F
passive recovery will facilitate more lactate removal than moderate aerobic
recovery - Ans--false
What is the benefit of interval training? - Ans---the overload of a specific
energy systems without too much lactate accumulation
-allows a greater duration of exercise and distance covered
List four difficulties with assessing Max Vo2 - Ans--1) more than 40% of
healthy individuals have difficulty attaining a plateau in Vo2
2) difficulty for patients with cardiovascular disease
3) Many people interpret muscle fatigue as pain and cannot/will not
continue to exhaustion
4) increasing to max exertion can increase for untoward events
, Open circuit spirometry is often utilized: - Ans---when a precise
cardiopulmonary response to a specific therapeutic intervention is required
-when assisting in the development of an appropriate exercise prescription
for cardiac and/or pulmonary rehabilitation
T OR F
An *estimated Max Vo2* is predicted from submaximal tests with either
direct analysis of oxygen consumption of from the relationship between HR
response and rate of work - Ans--false-would be true if it was *predicted*
instead of estimated
T OR F
HR increased linearly with increasing aerobic exercise after SV reaches its
maximal level - Ans--true
List four sources of error in estimating and predicting Max Vo2: - Ans--1)
prediction of HR max by age
2) calibration of cycle ergometer
3) HRSS in each stage
4) accurate measurement of heart rate
Advantages of using a submaximal exercise test include? - Ans---its
relatively inexpensive and requires less equipment, personnel, and medial
supervision
- the tests are generally shorter and easier to perform for the individual
T OR F
direct calorimetry measures energy metabolism by measuring the O2
consumption - Ans--false
What are the percentages of O2, CO2, and N in ambient air? - Ans--20.9%
O2
0.03% CO2
79.04% N
What does "RQ" stand for, and what is the equation used to obtain this
numbers? - Ans--RQ= respiratory quotient
CO2 consumed/O2 produced
