Key result
Hypertensive subjects exhibited greater low-frequency R-R variability during night-time rest compared to normotensives (56 vs 48 nu; P<0.05), indicating reduced day-night sympathetic oscillation.
Why the study?
Does mild hypertension alter the circadian pattern of neural control of heart period compared to normotension?
Observational
Does mild hypertension alter the circadian pattern of neural control of heart period compared to normotension?
Absolute Event Rate: 56% vs 48%
p-value: p=<0.05
Essential hypertension is characterized by a reduced day-night oscillation in sympathetic activity, with higher night-time sympathetic tone compared to normotensives.
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May reflect blunted nocturnal sympathetic withdrawal in mild hypertension; leaves open causal direction and need for prospective confirmation.
Guzzetti et al. (1991) conducted an observational in Mild hypertension. Hypertension vs. Normotensives was evaluated on Low-frequency component (LF) of R-R variability during night-time rest (0300-0400 h) (p=<0.05). Hypertensive subjects exhibited greater low-frequency R-R variability during night-time rest compared to normotensives (56 vs 48 nu; P<0.05), indicating reduced day-night sympathetic oscillation.
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