Energy Continuum (including OBLA) Flashcards
Energy continuum define
relative contribution of each energy system to overall energy production depending on intensity & duration of activity
what is contribution of each energy system dependent on (2)
- intensity
- duration
if duration increases what will be the dominant energy system & why
- aerobic system
- because intensity will decrease
if duration decreases what will be the dominant energy system & why
- Anaerobic systems (PC & Glycolytic)
- because intensity will increase
threshold define
point where there’s a change in dominant energy system used as cannot provide sufficient ATP to maintain current intensity
threshold of PC system
10 seconds
threshold for Glycolytic system
3 mins
threshold for aerobic system
OBLA
the energy systems ____ work in _______ and are all working at different _________ at different _____
- never
- isolation
- percentages
- times
percentage usage of each energy system is _______ ________
constantly changing
what is oxygen availability dependant on
efficiency of respiratory and cardiovascular system
hoe long is glycogen used as a food fuel
about first 20 mins of exercise
when a re fats (FFAs) used as food fuel
after about 20-45 mins alongside glycogen
(unless have refuelled during exercise)
how much more oxygen do FFAs require to break down
15%
what des FFAs requiring more oxygen require the athlete to do
lower intensity
how long does it take glycogen stores to become fully depleted
about 2 hours
what happens after glycogen is fully depleted
FFAs exclusively used as food fuel
what happens when FFAs used up
sudden fatigue - OBLA
what is OBLA
point at which aerobic energy system can no longer re-synthesise ATP for energy
when does OBLA occur (systems)
- aerobic system stops working
- turns to anaerobic systems
- anaerobic systems also empty
- body flushed with lactic acid
OBLA is the _________ _________
anaerobic threshold
what is the point at which OBLA occurs
when blood lactate levels reach 4mmol/L
what delays OBLA
aerobic fitness levels
4 mmol/L is where…
production of lactic acid exceeds speed of removal
how does an endurance athlete improve aerobic fitness levels
exercise just below lactate threshold
