Maximal heart rate does not limit cardiovascular capacity in healthy humans: insight from right atrial pacing during maximal exercise

G D W Munch, J H Svendsen, R Damsgaard, N H Secher, J González-Alonso, Stefan Mortensen

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Abstrakt

In humans, maximal aerobic power (VO2 max ) is associated with a plateau in cardiac output (Q), but the mechanisms regulating the interplay between maximal heart rate (HRmax) and stroke volume (SV) are unclear. To evaluate the effect of tachycardia and elevations in HRmax on cardiovascular function and capacity during maximal exercise in healthy humans, 12 young male cyclists performed incremental cycling and one-legged knee-extensor exercise (KEE) to exhaustion with and without right atrial pacing to increase HR. During control cycling, Q and leg blood flow increased up to 85% of maximal workload (WLmax) and remained unchanged until exhaustion. SV initially increased, plateaued and then decreased before exhaustion (P
OriginalsprogEngelsk
TidsskriftJournal of Physiology
Vol/bind592
Udgave nummerPt 2
Sider (fra-til)377-90
Antal sider14
ISSN0022-3751
DOI
StatusUdgivet - 15. jan. 2014
Udgivet eksterntJa

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