Key result
Upright graded cycle exercise at 75-W revealed significantly lower stroke volume in POTS patients compared to healthy controls (70 vs 94 ml, P<0.01), driving excessive tachycardia.
Why the study?
Does cardiovascular regulation during exercise differ between POTS patients and healthy controls?
Population
13 patients with postural tachycardia syndrome (POTS) and 10 healthy controls
Comparison
Graded cycle exercise at 25, 50, and 75 W in… vs Healthy controls performing the same exercise…
Design
Case-control
Authors
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Supports reduced upright stroke volume as driver of compensatory tachycardia in POTS; hypothesis-generating for targeted interventions.
Case-Control (n=23)
Does cardiovascular regulation during exercise differ between POTS patients and healthy controls?
Absolute Event Rate: 70% vs 94%
p-value: p=<0.01
In patients with POTS, the greater elevation in heart rate during exercise, especially while upright, appears secondary to reduced stroke volume and is associated with exercise intolerance.
Masuki et al. (2007) conducted a case-control in Postural tachycardia syndrome (POTS) (n=23). Graded cycle exercise (supine and upright) vs. Healthy controls was evaluated on Upright stroke volume during 75-W exercise (p=<0.01). Upright graded cycle exercise at 75-W revealed significantly lower stroke volume in POTS patients compared to healthy controls (70 vs 94 ml, P<0.01), driving excessive tachycardia.
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