exercise physio Flashcards
maximum shortening velocity of a fibre is dependent on its type (I or II)
type I - slow twitch
type II - fast twitch
type I fibre is mostly red/white
red
type II fibre is mostly red/white
white
type I - slow twitch - ideal for …
low power endurance activity
type II - fast twitch - ideal for …
high power short bursts of activity
wide range of exercise types require a different balance of ….. which can drive different physiological …
energy systems, responses
long distance running - only energy system that fuels long endurance requires … to generate ATP by oxidative phosphorylation
oxygen
O2 delivery - incremental exercise
increasing intensity, increased O2 consumption
incremental exercise is how …. fitness is assessed
cardiorespiratory
fuel for long distance running
mixture of fat and glycogen oxidised
which produces ATP at a faster rate - glycogen metabolism or fat metabolism
glycogen metabolism
fuel for long distance running can become glycogen …..
depleted
middle distance running - glycogen won’t be depleted, higher work rates maintained. what is the primary fuel source
glycogen - fat metabolism can’t keep up with ATP demands
middle distance running - increased rate of …. and increased lactate + H+ production
glycolysis
metabolite accumulation leads to …
muscle fatigue
what is a useful performance/fitness measure
measuring LT - lactate threshold
LT indicates work rate when …. production increases and greater reliance on …. stores
metabolite, glycogen
…. accumulating limits running speeds over middle/long distance sprints
metabolite
work rates achievable during a long sprint are not ….
maximal
what does maximal sprint activity require
faster rate of ATP production than ATP produced by glycolysis
short sprint - exercise less than 10 seconds can be powered entirely from ….
anaerobic sources
anaerobic sources - rapid ATP supply include muscle ….. stores and ……. system
ATP, phosphocreatine system
short sprint - muscle …… store affects sprint/power performance
pcr store
short sprint - how are larger type II muscle fibres beneficial for sprinting/power performance
greater maximal force
short sprint - how are faster type II muscle fibres beneficial for sprinting/power performance
greater maximal shortening velocity
force x velocity =
power
training adaptations - endurance training
enhances O2 delivery and utilisation
training adaptations - strength/power training
enhances maximal muscle power output
strength/power tests assess ..
maximal force or power output
most common endurance tests assess ..
VO2 max - maximum rate of O2 delivery/utilisation in working muscles
endurance tests assess LT -
work rate where blood lactate increases
