Lecture 8 Flashcards
*How could you estimate energy systems contributions in intermittent-intensity activities?
GPS, changes in gait, time, distance
Oxygen deficit:
Diff b/w total o2 consumption during ex and the total that would have been consumed had steady-state o2 consumption have been achieved from the start
*The dominant approach to determine both peak and mean anaerobic power has been to….
Measure the rate & quantity of work performed under circumstances in which aerobic metabolism is assumed to contribute very little.
Peak anaerobic power tests*
The predominant energy source is from the ATP/PCr system
Mean anaerobic power tests *
Anaerobic glycolysis is presumed to be the prime energy source
Anaerobic capacity:*
The maximal amount of ATP resynthesized via anaerobic metabolism (by the whole organism) during a specific mode of short-duration maximal exercise (supra-vo2max effort)
Uses of work/power tests:
1 assessing current capacity & comparison with established norms*
2 monitoring changes in physiologic capacity as a result of training
3 determining event characterization*
4 establishing a goal for a rehab program
5 identifying talent or providing guidance in even selection
6 serving as a motivational tool *
7 predict performance *
Force (F):
That which causes or tends to cause a change in an object’s motion
Mass (m) x acceleration (a)
Newtons (N)
Work:
Product of the F applied to an object and the linear distance the object moves as a result of the applied force
= F x d
Joules (J)
Power:
Amount of work performed /unit of time
= work / t
(W)
P = F x d / t
Anaerobic power:
Maximum power
Anaerobic capacity:
Average power and /or total work calculated over certain time
Physiological assessment of anaerobic energy system:
Size of intramuscular ATP-PCr pool Depletion rates ATP & PCr in all-out short duration ex O2 deficit calculation from initial phase of ex o2 consumption curve Alactic portion (fast component) of recovery o2 consumption
Physical assessment of anaerobic energy system:
Performance that substantially activate the short-term E system requires maximal E for up to 3mins All-out run All-out cycle ergometer Shuttle run Vertical jump protocol Repetitive weight lifting
1RM prediction equation*
1RM = [(weight used) x (# reps performed) x (0.03)] + wt used]
vertical jump tests used as…
index of peak anaerobic power output.
Peak power:
Highest power output achieved in a short high-intensity sprint test
Maximal accumulated o2 deficit (MAOD):
Diff b/w o2 equivalanet of the work performed and the o2 consumed during an anaerobic capacity test
MAOD limitation:
Extrapolation of the linear r/ship b/w vo2 and submaximal work intensities may not yield a valid estimate of the o2 requirement of supramaximal work
MAOD assumption:
The mechanical efficiency of supramaximal work is identical to that for submaximal work
Diff b/w anaerobic capacity test and MAOD
MAOD – oxygen, anaerobic capacity – anaerobic peak & mean power, fatigue
