Aerobic Performance Flashcards
What is aerobic energy?
where oxygen is the final electron acceptor in ETC
where is aerobic energy produced?
mitochondria
Oxygen doesn’t directly resynthesise ATP so what does it do?
determine the maximal rate of aerobic ATP resynthesise
where is the ETC membrane in mitochondria
inner membrane
Simplified ETC -
NADH+H - hydrogen released, NAD leaves, electrons passed down chain and then accepted by 02 and form H20 w/ H
What happens in ETC when 02 is limited?
chain can’t finish so build up of reduced NADH+H
How does NADH+H build up effect the krebs cycle
flux is reduced
therefore more anaerobic energy turnover (= lactate ^ PH down, perf down)
what is the fick equation?
VO2 max = Q max x a-v02 diff max
(Q max = SV max x HR max) (delivery)
(a-v02 diff max = venous 02 content - arteriole 02 content) (extraction)
Central limitation examples
- pulmonary diffusion
- max CO
- bloods carrying capacity
Peripheral limitation examples
extraction & utilisation of 02 delivered to muscles
Central limitation evidence
Arm work tests produce 65-75% of VO2max
Arm and leg work combined VO2max is the same
limitation must be central because if it was peripheral much high VO2max values would be expected
Further central limitation evidence
^ O2 = ^ VO2 max
^ RBC = ^ VO2 max
and reversed
Peripheral limitation evidence
Single leg training study - significant increase in VO2 max in trained leg - due to improved mitochondrial volume and oxidative enzymes
(only relevant for smaller muscle groups)
what was the traditional test protocol and what did it lead too?
discontinued series of work/speed steps
plateau in data during final stages
(also time consuming and ill suited for clinical populations)
what is the new V02 max test?
Ramp incremental test with breath by breath gas analysis
