MEDI110 Lecture Notes - Lecture 5: Endurance Training, Sympathetic Nervous System, Athletic Training
6 Aug 2018
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Acsm position statement 1998: frequency, 3-5 days p/week (preferable all days) Intensity: 55/65% - 90% mhr or, 40/50% - 80% hrr, low intensity initially for very unfir, duration, 20-60 min, use large muscle groups. Recognise the impact of training on the cardiovascular system (an athletes heart) Effect of endurance training: endurance training creates an imbalance, greater pns (vagal) dominance. Increased pns activity and some sympathetic nervous system discharge: may also de(cid:272)rease si(cid:374)oarterial (cid:374)ode(cid:859)s firi(cid:374)g rate. Athlete(cid:859)s heart: cardiac hypertrophy = increase in heart size, a slight increase can occur with exercise training, regular aerobic exercise results in, myocardial protein synthesis (increased size of heart) Increased thickening of cardiac muscle fibres: cardiac muscle fibres contractile elements increase in number, training ceases = heart rate returns to previous size. Impact of training on heart rate, cardiac output and stroke volume: sv = increased, co = increased, hr = decreased. Physiological adaptations that contribute to increased stroke volume.
