Key result
Four-hour sleep restriction alters post-arousal heart rate and reduces pulse transit time more in females.
Why the study?
Chronic short sleep duration is linked to cardiovascular disease risk, especially in females, but the impact of biological sex on hemodynamic reactivity to spontaneous nocturnal arousals after sleep restriction remains largely unknown.
Does sleep restriction alter heart rate and pulse transit time changes following spontaneous arousals in healthy males and females?
Comparison
Four-hour sleep restriction vs normal nine-hour sleep
Design
Two 16-day in-patient crossover study
Authors
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May alert clinicians to greater female vascular sensitivity to sleep loss; leaves open its contribution to sex differences in cardiovascular disease risk.
Does sleep restriction alter heart rate and pulse transit time changes following spontaneous arousals in healthy males and females?
p-value: p=0.013
Sustained sleep restriction disrupts nocturnal vascular responsiveness to spontaneous arousals more in females than males, providing mechanistic insight into the sex-specific relationship between shortened sleep duration and cardiovascular disease risk.
Greenlund et al. (2026) studied Healthy volunteers (n=19). Sleep restriction vs. Normal sleep (nine-hour sleep opportunity) was evaluated on Heart rate (HR) and pulse transit time (PTT) changes following spontaneous arousals (p=0.013). Nine days of four-hour sleep restriction altered heart rate response (p=0.013) and caused greater pulse transit time reduction following spontaneous arousals in females compared to males (p=0.007).
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