KINE 1020 Lecture Notes - Lecture 42: Stroke Volume, Ejection Fraction, Exercise Intensity
29 Mar 2016
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Exercise and heart rate: heart rate: vagal (parasympathetic) withdrawal ~100-110 bpm (quick) Age-predicted heart rate maximum = 220 age. Usually accurate within 10-15 beats per minute: used to predict exercise intensity much easier than measuring oxygen uptake (vo2) Options to increase vo2: deliver the same and extract a greater proportion, deliver more and extract the same proportion, deliver more and extract and greater proportion. Extraction is related to the diffusion gradient, diffusion area and barriers to diffusion. Recap: exercise and vo2 : oxygen delivery, oxygen concentration, blood delivery, oxygen extraction: Increase: diffusion gradient, diffusion area (transit time), diffusion area (capillary density): increase, barriers to diffusion: Would we increase vo2max if we could make: the heart beat faster. No actually go down because your heart doesn"t have enough to fully fill. stroke volume may time: the heart beat more blood per beat.
