Week 8 Flashcards
VO2 slow component
A slowly developing increase in V·O₂ during constant-work-rate exercise performed above the lactate threshold, represents a progressive loss of skeletal muscle contractile efficiency (excess O2 cost) and is associated with the fatigue process
When is the slow component visible?
During constant load exercise in HVY
During SVR but steady state not achieved
Relationship between exercise intensity and fat oxidation
Fat oxidation initially increases with exercise intensity before declining at high work rates
Key determinants of maximal fat oxidation
Training status
Sex
Acute nutritional status
Chronic nutritional status
Effect of exercise modality
Why is fat oxidation reduced at high exercise intensities?
Reduced fatty acid delivery to and uptake in skeletal muscle
What does a negative fat oxidation mean?
oThe RER ratio tells us about substrate utilization
oIf RER= 1 that is 100% carb metabolism
oIf RER= 1.05 that would mean, we get 105% from carb utilization and -0.05% from fat utilization
oMay see this as an error in our data
Practical applications of 3 min all out CP test
Provides parameters that reflect both aerobic and anaerobic metabolism that can be used to demarcate the heavy from severe exercise intensity domains, assess fitness, prescribe training intensities, and predict exercise performance
Other ways to assess CP/CS
Running on track
Online calculators
FTP test
Trial and error with steady state bouts
How to find CP/CS when running on track
100 m splits and look at pace they settle at
Functional threshold power
Fast as you can for 20 min to determine CS
Trial and error with steady-state bouts
Repeat steady state bouts with increasing intensity to find pace you can’t sustain= CP
What three parameters can be determined from the Wingate anaerobic test?
- Peak power
- Mean power
- Fatigue index
Peak power
Max value of power
Corresponds to maximal anaerobic power
Mean power
Total amount of work
Index of anaerobic capacity
Fatigue index
Rate of power decrease
Anaerobic capacity from Wingate test
Area under curve
Short track speed skating
Olympic sprint event in which performance depends on anaerobic capacity (glycolytic and phosphate systems)
Wingate results and short track speed skating
Significant correlations btwn Wingate anaerobic test outcomes and 500m performance of speed skating athletes and therefore we can measure progress doing a Wingate test to predict sprint performance
Wingate test leg power and performance
Measures of leg power assessed by the Wingate cycling test were strong correlates of skating performance (predicts speed in hockey players)
