Lecture 4 - Aerobic Testing Flashcards Preview

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Flashcards in Lecture 4 - Aerobic Testing Deck (31):
1

aerobic fitness

- considered one of the most important determinants of health
- represents ability to perform dynamic exercise involving large muscle groups for longer periods
- indicates ability to sustain physical effort over a period of time

2

what is VO2 max

maximal volume of O2 one can consume during exhaustive exercise

3

2 things VO2 depends on

1. transport of Oxygen via CR system to working muscles
2. ability of muscle to utilize oxygen during exercise

4

equation for VO2

(HRxSv)x(a-vO2 diff)
(delivery) (extraction by muscle)

5

what does a direct test measure

actual construct of interest
- components: O2, CO2, VE (can be submax or max)

6

what does an indirect test measure

measures construct known to be related (predictive) to actual construct of interest

7

examples of direct measurement

VO2 max (treadmill, ergometer - cycle, arm, rower)

8

examples of indirect measurement

- step test (mCAFT)
- queens
- YMCA cycle test
- astrand cycle test
- ebbeling treadmill test
- 1.5 mile run
- 20MSR
- bruce treadmill test

9

protocols for tests

see notes on paper

10

HR recording in submax tests

- record HR at end of each minute
- must achieve steady state (within 5bpm over subsequent readings) over duration of test/ stage

11

single stage models

- use one submax workload to predict VO2 max
- typically 4-6 min

12

multistage model

- use two or more submax workloads
- typically 3 min per stage

13

absolute VO2 max

- directly related to body size
- L/min or mL/min

14

relative VO2 max

- compare CR fitness regardless of body size
- mL/kg*min

15

submax fitness end criteria

- target HR obtained
- cannot maintain cadence or workload
- client asks to stop
- signs of physiologial stress

16

submax test - active recovery protocol

- low intensity aerobic cool down for 3 min
- measure HR at end of each min
- extend if not recovered
- seat client and measure 1 and 3 min HR and BP

17

max test - active recovery protocol

- low intensity aerobic cool down for min 5 min
- measure HR at end of each min
- supervise client for a min of 15 min upon cool down completion

18

what are the assumptions between PO, VO2 and HR

all linear (all increase together)

19

4 assumptions of indirect tests

1. SS HR is obtained for each work rate (within 5 bpm for subsequent readings) - can vary +/-20bpm
2. max HR for given age is uniform
3. linear relationship between HR, VO2, PO (sleep caffeine alcohol)
4. mechanical efficiency (VO2 @ given work rate) is same for everyone

20

direct measurement test selection

- consider specifcity to sport of client
- cycle ergometer: often yeilds lower max values, local muscle fatigue but more safety
- treadmil: yields higher max values, more familiar, less safe, bad for medical conditions

21

regulating workload

- O2 consumption increases linearly with workload
- on treadmill, workload changes by manipulating speed and elevation (manipulate load on cycle ergometer)

22

power output on cycle ergometer - equation

power = work (fxd)/ time

23

direct test measurement system

- lab based using open-circuit spirometry
- gas colelction system (valves, tubing, stopcocks, collection of gas, co2 and o2 analyzers)

24

RER ratio

VCo2/Vo2 (can be influenced by hyperventilating)

25

direct tests - gold standard

- graded exercise tests
- duration: 8-12 min
- begin at submax workload and provide gradual systematic increases to point of volitional fatigue

26

why is a direct measure only supposed to be 8-12 min

- balance bet preventing exhaustion anaer. before reaching max and exhausting muscles due to length
- avoid vasodilation
- avoid lactic acid built up

27

end criteria of direct max test

- HR: fails to increase or close to age predicted max
- blood lactate (>8mmol/L)
- RER >=1.15
- volitional fatigue
- plateau

28

immediately terminate test if...

-dizzy
- volitional fatigue
- mental confusion
- cyanosis or pallor
- BP does not increase or suddenly drops
- SBP >= 250
- DBP >=120

29

anaerobic threshold

- level of O2 consumption at which there is a rapid and systematic increase in Blood lactate or non-linear increase in ventilation (RER~ 1.0)

30

VO2 max

- power test
- measures rate of O2 uptake during max exercise
- rate = power
- defined as functional ability of CR system
- most valid measure of functional ability of CR system --> criterion (gold standard) measure of CR fitness

31

5 types of different tests

1. direct vs indirect
2. absolute vs relative
3. max vs submax
4. peak vs max
5. power vs capacity