lecture 16 - rapid energy production and muscle metabolic fatigue Flashcards
what provides energy?
When the phosphate bonds are removed
how many grams of ATP is stored in the muscle tissue?
40-50 (it is used up in 2-4 secs)
what happens to the rate of energy production the longer we exercise?
it decreases
what requires a high rate of ATP generation?
Very high intensity exercise of short duration
what does rapid demand in ATP mean for the pathways relating to energy?
it cant use the aerobic metabolic pathways as it is too slow
what is the enzyme which catalyses the breakdown of ATP to ADP?
creatine kinase
what is phosphocreatine broken down into?
phosphate and creatine
what will PCr concentrations neer reach?
0 as your body has a fail safe mechanism
where does the energy for ATP come from?
Aerobic energy production, which happens at a much slower rate
does it take long to fully resynthesise PCr?
no, it happens pretty quickly
what does this need for rapid energy create?
an oxygen deficit
- this energy comes from non-aerobic sources e.g. glycolysis
where can we get creatine supplementation from?
meat, eggs, fish
what effect does sprint training have?
utilises glycolysis, utilises PCr, enzyme activity, transports proteins and hypertrophy
why can you not keep sprinting at the same intensities?
aerobic metabolism isnt quick enough
why does PCr deplete?
We only have a finite store, hence why people often supplement with creatine
what is acidosis?
reduced pH
what is reactive oxygen species?
molecules that have an unpaired electron – damage other cells by stealing electrons
what is metabolic fatigue during high intensity intermittent sports?
acidosis, impaired calcium function, build up of hydrogen, muscle glycogen depletion etc
