exercise intensity domains Flashcards

1
Q

what is the gold standard protocol for VO2 max testing and exercise thresholds

A

ramp incremental test (RIT)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what is the relationship between O2 measured from the mouth and PO

A

increase linearly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what is mean response time (MRT)

A

delay in VO2 increase in relation to PO at the beginning of RIT
- PO increases while VO2 is stable for a few seconds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what causes MRT

A

transit delay in physiological repsonses that need to occur at the beginning of exercise to meet muscle VO2 demand
- takes time for the level of O2 to go down in the musce and for the resp system to respond (transit time - values only measured at the mouth)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

how to account for MRT when prescribing exercise

A

PO difference produced by MRT should be subtracted from the ramp PO
(otherwise exercise intensity will be underestimated)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

which factors need to be considered in the moderate, heavy, and severe domains

A

moderate = MRT
heavy and severe = MRT and slow component

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what is the slow component

A

VO2 gradually goes up even at constant PO (drift in O2 uptake)
- as intensity increases, differences between VO2 and PO increases (increases dissociation)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

when does dissociation of VO2 in relation to RIT happen (slow component)

A

above GET - highest after RCP
(no slow component in moderate domain)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what are the differences in constant load and RIT

A

higher VO2 in constant load/step
need to correct for slow component in RIT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what are the reasons for the slow component (VO2 dissociation)

A

80% oxygen uptake in muscle during exercise
increased ATP turnover in muscle fibres

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

why is there increased ATP turnover in muscle fibres

A

increased metabolic cost of fatiguing fibres
- tired muscle units = inefficient
- greater VO2 needed
- more energy needed for ion pumping

recruitment for more type II muscle fibres
- type II = less efficient than type I
- replacing fatigued type I fibres

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

who has more or less slow component and why

A

women = less slow component
- have more type I muscle fibres therefore delayed recruitment of type II fibres

untrained = large slow component
- early recruitment of type II fibres

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

how much dissociation of O2 uptake happens in moderate intensity domain

A

no dissociation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

how much dissociation of O2 uptake happens in heavy intensity domain

A

VO2 takes longer to stabilise and reaches values that are greater than predicted
- won’t reach VO2 max due to slow component

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

how much dissociation of O2 uptake happens in severe intensity domain

A

VO2 gradually increases to VO2 max due to VO2 dissociation (drifts up)
only domain where this happens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

how much dissociation of O2 uptake happens in extreme intensity domain

A
  • exhaustion occurs before VO2 max reached
  • all exponential - no plateau in VO2
17
Q

why are thresholds important

A

prescribe exercise accurately
- same relative intesnity
- put individuals in the correct domain

predicts exercise performance
- determine the feasibility of a given task
- can predict how long people can go

18
Q

what is the exercise tolerance across the different domains

A

severe = seconds-45 mins
heavy = 45 mins-2 hours
moderate = >2 hours

19
Q

what is the variance in GET

A

40-80% of VO2max
typical = 60-65%
low end = untrained
high end = trained

20
Q

what is the variance in RCP

A

65-95% of VO2max
typical = 80%
low end = untrained
high end = highly trained

21
Q

can you shift the ratio between GET and RCP

A

yes
ex: 400m runner = high GET but low RCP % of VO2max

22
Q

what is the effect of slope of RIT on PO

A

at GET = very close (very small PO difference between slopes)
at RCP = large PO difference

way higher in larger slope
longer time = higher fatigue, can sustain less PO

23
Q

what is the effect of slope of RIT on VO2

A

no effect
same VO2 response at each threshold regardless of slope

24
Q

what is critical power

A

max rate of work that a muscle/muscle group can keep up with for a very long time without fatigue

greatest metabolic rate that results in only oxidative energy production

25
what can critical power be used for
find RCP threshold without metabolic cart or lactate measures - severe vs heavy domain
26
how to find critical power
needs multiple sessiosn ot task failure session 1 = very high intensity to failure PO lowers with each session can predict from PO curve
27
what is W'
shape of hyperbolic curve - area under the curve of the power v time graph (above critical power line) amount of work that can be performed above critical power
28
what does W' predict
time to exhaustion in the severe intensity domain
29
what is W' correlated with
type II muscle fibres (above RCP) no correlation with mito content and type I fibres
30
what is W' a measure of
exercise tolerance for intensities dependent on anaerobic metabolism (above critical power)
31
what is critical power correlated with
elevates with increasing mito content and type I fibres
32
what does the critical intensity of exercise separate
heavy and severe domain above = unstable (exponential increase in VO2 and blood lactate) below = metabolically stable
33
how to find critical intensity
MLSS and CP