KIN 275 Lecture Notes - Lecture 5: Vagal Tone, Vo2 Max, Exercise Intensity
14 Apr 2016
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Responses to acute exercise: altered heart function, hr, sv, cardiac output, increased blood flow to working muscle. Affected by neural tone, temp, altitude: hr just before exercise. Anticipatory response: hr up above rhr just before start of exercise: vagal tone decreases, norepinephrine, epinephrine up, hr during exercise. Max hr is highest hr achieved in all-out effort to volitional fatigue: some biological variation to max hr. Steady state hr: point of plateau, optimal hr for a given (submax) exercise intensity. Thursday, april 14, y: meets circulatory demands of the body, adjustments to an altercation in intensity can take ~2-3 minutes. Stead-state hr are the basis for simple exercise tests that estimate vo2max: hr progression as a fund of vo2max, starts from 110 to max hr. Stroke volume: as intensity increases up to 40-60% of vo2max. During max exercise sv will double resting: sensitive to preload, contractility, after load.
