Lab Test 1 (lab 4) Flashcards
A prediction of maximal oxygen consumption based on cycle ergometry
astrand-rhyming test
Most commonly used index to assess CR fitness or the ability to do sustained work
VO2max
On a VO2 max vs workload graph the increasing slope indicates this
VO2 submax
Methods of determining VO2 max
Maximal
Submaximal
How do we know the VO2max has been reached during maximal testing (4)
RER >= 1.1
HR max is achieved
Plateau VO2 with increased workload
RPE > 17 (6-20 scale) or > 9 (0-10 scale)
Calculation for age predicted heart rate max
220-age
Disadvantages of maximal testing to determine VO2max (5)
Subjects need to be motivated higher risk than submaximal testing time consuming expensive trained exercise testers are required
Two types of maximal VO2max testing (2)
12 minute run
1.5 mile run
How to conduct a 12 minute run test
run as far as possible in 12 minues and then measure distance covered
r = this in a 1.5 mile run
0.90
VO2 vs distance graph
postive slope
slope is steeper for individuals with higher VO2max
VO2 vs 1.5 mile run time
negative slope
Disadvantages of 12 minute run and 1.5 mile run (5)
pacing is a factor motivated subjects required safety (streets vs track, unmonitored blood pressure and heart rate) environmental factors specificity (type of event ex. cyclist)
Two types of submaximal VO2max testing
Step test (harvard step test) cycle ergometer
What is the step test based on (3)
age, gender, recovery HR
Advantages of the step test (4)
safe
less motivation is required
pacing is not a factor
mass testing is possible
Disadvantages of the step test (4)
low validity and less accurate
low correlation with VO2max
also reflective of muscular endurance
local muscular fatigue
Cycle ergometer advantages (6)
allows for a calculation of work rate high validity (r=0.85) high reliability (r=0.90) decreased risk pace is controlled only a 6 minute test
Formula for cycle ergometry workrate
(load) x (6m) x (RPM) = kgm/min
RPM = 50
Astrand-Rhyming test is a submaximal cycle test based on the relationship of these 3 variables
VO2
HR
workload
assumed mechanical efficiency of submaximal astrand-rhyming test
10.1 mL O2 / min / W
describe the graph of HR vs workload
positive linear slope
describe the graph of HR vs VO2
Positive linear slope
describe the graph of HRmax vs age
Negative linear slope
2 ways to control the workrate on the ergometer
resistance
RPM
T/F (assumptions of VO2 prediction): the heart pumps more efficiently and O2 is more readily utilized for metabolism in more fit individuals
T
T/F (assumptions of VO2 prediction): increased cardiovascular efficiency is an assumption of VO2 predicitons
T
T/F (assumptions of VO2 prediction): heart rate is higher to met the metabolic demands of tasks in fit individuals
F, lower
T/F (assumptions of VO2 prediction): if 2 individuals work at 150 b/min the less fit individual will be working at a higher work rate
F, More fit
T/F (assumptions for submaximal test): a steady heart rate is for each exercise work rate
T
T/F (assumptions for submaximal test): A inverse U relationship between HR and workrate
F, linear
T/F (assumptions for submaximal test): Maximal heart rate for any given age is variable
F, uniform
T/F (assumptions for submaximal test): Mechanical effeciency (VO2 at a given workrate) is the same for everyone
T
T/F (assumptions for submaximal test): Medications that affect heart rate are not a concern
F
Steps to calculate VO2max (4)
1 Determine preliminary VO2 max
2 Multiply by age correction factor
3 multiply by 1000
4 Divide the age corrected VO2 max by the body weight in kg
