Lec 24 Exercise Intensity Domains Flashcards
describe blood lactate responses to constant load exercise across the domains
severe - increase and does not stabilize
heavy - increases but stabilizes
moderate - no or very small change
what is considered the gold standard for quantifying Vo2max and gas exchange thresholds
ramp incremental test
when performing a RAMP incremental test
at the levels of the mouth
______ increases linearly with _______
BUT what…? what is this known as ?
VO2 increases linearly with power output
but VO2 shows an INITAL delayed increase in relation to power output
known as mean response time
During mean response time in a RAMP incremental test what happens
power output increases due to increase in RAMP BUT VO2 is stable for a few seconds
what causes Mean response time aka MRT
transit delay in physiological mechanisms aka NEURAL and HUMORAL adjustments
these adjustments need to occur at the beginning of exercise to meet the demands of VO2 at the level of the muscle
what is mean response time measured from
ramp incremental test
when prescribing exercise from a RIT in the moderate domain what should you do?
why?
the power output difference produced by MRT should be subtracted from the RAMP power output
otherwise the exercise intensity will be underestimated
when prescribing exercise from a RIT in the heavy and severe domain what should you do?
slow component should be considered
and MRT
when prescribing exercise from a RIT what should be considered in moderate, heavy, and severe domains
moderate - just MRT
heavy and severe - MRT and slow component
when comparing CPO and RIT
at a given power output which will have a higher VO2
this mean that __________ underestimates VO2 demands
CPO will have higher VO2 values
this means that RAMP underestimates
when comparing CPO and RIT
what happens after GET
dissociations occur between the two tests above GET and as you go further the differences get bigger
what are the reasons for the dissociation of VO2 during CPO vs RIT
the muscles consumes most of the additional VO2 (>80%)
seem to result from an increased ATP turnover in muscle fibers
- Increased metabolic cost of fatiguing fibers
- recruitment of more type II fibers - less efficient
what happens to dissociation of oxygen uptake in the four domains of exercise
moderate - no dissociation
heavy - VO2 takes longer to stabilize and, reaches values that are greater than predicted because of dissociation of VO2
severe - VO2 increases to VO2 max because of dissociation of VO2
Extreme - Exhaustion occurs before VO2 reaches VO2max
why are thresholds important
allows for accurate prescription of exercise
- prescribe exercise at the same relative intensity across individuals (aka putting individuals in the correct domain)
predicts exercise performance
- determine the feasibility of a given exercise task
what should we never prescribe exercise based of off
absolute power output
what should we prescribe exercise off of
exercise domains
Exercise tolerance
how long should we be able to perform exercise in each intensity domain
moderate >2 hrs
heavy 45min to 2 hrs
LESS THAN MODERATE
severe secs to 45 min
thresholds are highly _____
individual
what is the range of VO2max for GET/LT
40-80% Vo2max
what is the range of VO2max for RCP/MLSS
65-95% of Vo2max
what is the problem with prescribing exercise to two individuals at the same percentage of VO2max
individuals are not necessarily experiencing the same metabolic stress !
what happens when prescribing exercise given fixed percentages of VO2max, HRmax, etc.
there is a large amount of interindividual variability in acute physiological responses
how does the slope of a RIT affect the power output at RCP
a steeper slope will have a higher PO at RCP
does the slope of RIT affect power output at GET
NO
