Why the study?
Does static exercise with fixed heart rate alter the mechanisms of stroke volume increase in patients with complete heart block?
Population
10 patients with preserved inotropic function having a dual-chamber pacemaker placed for complete heart block
Comparison
Static one-legged knee extension at 20% of… vs Static one-legged knee extension at 20% of…
Design
Other
Follow-up
5 minutes
Authors
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Suggests preserved SV reserve during fixed-HR static exercise in heart block; leaves open generalizability and requires prospective confirmation before clinical application.
Does static exercise with fixed heart rate alter the mechanisms of stroke volume increase in patients with complete heart block?
During static exercise with a fixed heart rate, stroke volume increases via a combination of the Frank-Starling mechanism and increased contractility at resting heart rates, but primarily via increased contractility at higher heart rates.
Nóbrega et al. (1997) studied this question.
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