adaptations in body physiology L19-20 Flashcards
VO2max
maximal amount of oxygen delivered to working tissues and utilised in aerobic metabolism
max rate of aerobic metabolism
VO2
measure of aerobic metabolism rate
physiological factors of VO2
utilization theory (O2 utilization of body)
presentation theory (delivery of O2)
graded exercise test
8-10 mins of exercise w large muscle groups
^load stepwise every 4-6 mins
e.g. ramp protocols/ square wave test
ventilatory response to exercise
immediate increase w feed forward reflex
peripheral/ central chemoreceptors control rate
VR stays elevated until ATP stores return to normal
feed forward reflex
muscle/ joint proprioceptors> motor cortex> resp centre> ^ventilation
VENTILATORY THRESHOLD
point at which ventilation starts to increase at faster rate than VO2
fick equation
VO2max = Q*(a-v)O2c
heart rate ^ mediation
^SA node sympathetic activation
decreasing para
stroke volume control
^ symp output ^contractility
^end diastolic volume
results from cardiac dimension/ blood volume/ venous return changes
Frank-starling mechanism
^ventricular filling and emptying
oxygen extraction
more effective flow distribution
^extraction ability
oxygen extraction factors affecting
^capillarisation
^capillary to fibre ratio
^aerobic capability
^altitude effects
hypobaria
same %O2
decreasing O2pp
dalton’s law
sum of partial pressures = total pressure