Middle distance vs endurance Flashcards
When exercise lasts longer than 1-2 minutes, where is a lot of energy sourced from?
Oxidative metabolism
What energy sources provide energy for the sudden acceleration at the start of a race?
ATP and PCr
How long can middle distance runners run at max intensity before fatiguing?
3-4s, long enough for the final sprint
How do the muscles recover from a middle distance run?
Restoration of PCr and ATP; removal of lactate; restoration of pH; recovery of muscle glycogen
What length of running is classed as endurance?
> 30mins
What is the predominant source of energy for endurance running?
Aerobic metabolism; fat oxidation
What hormones increase fat oxidation?
Epi, NE, glucagon, cortisol, HGH all promote hormone-sensitive lipase
What hormone decreases fat oxidation?
Insulin inhibits hormone-sensitive lipase
What is the major fibre type in endurance runners?
Type I; so has more mitochondrial capacity and enzymes, increased glycogen, increased IMTG, and increased capacity to oxidising fats and carbs
How does intensity relate to the substrate oxidised?
Higher intensity increases reliance on carbs; lower intensity increases reliance on fats
How does the muscle strength change after endurance training?
Lower isometric strength; lower muscle mass
At what VO2max can fat oxidation no longer meet required ATP?
Above 50-60% VO2max
What is endurance performance strongly related to?
Pre-exercise muscle glycogen
After training, how much carbs could be consumed asap?
50-100g, in order to increase muscle glycogen stores
For 100-200m run, where is ATP majorly sourced from?
ATP, PCr, anaerobic glycolysis
