Key result
Targeted deletion of beta1-adrenergic receptors in mice significantly decreased resting heart rate (488 vs 638 beats/min in wild-type, P<0.0005) and increased heart rate variability.
Why the study?
Does targeted deletion of beta1- and beta2-adrenergic receptors affect heart rate variability and autonomic signaling in mice?
Does targeted deletion of beta1- and beta2-adrenergic receptors affect heart rate variability and autonomic signaling in mice?
Absolute Event Rate: 488% vs 638%
p-value: p=<0.0005
Deletion of beta1-adrenergic receptors, but not beta2-adrenergic receptors, decreases resting heart rate and increases heart rate variability in mice, demonstrating their differential roles in autonomic signaling.
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Subtype-specific beta-AR roles in HR regulation need further definition in mice; leaves open translation to human cardiac physiology.
Ecker et al. (2005) studied this question. Targeted deletions of beta1- and beta2-adrenergic-receptor subtypes vs. Wild-type mice was evaluated on Resting heart rate (beats/min) (p=<0.0005). Targeted deletion of beta1-adrenergic receptors in mice significantly decreased resting heart rate (488 vs 638 beats/min in wild-type, P<0.0005) and increased heart rate variability.
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