Regular aerobic exercise counteracts endothelial vasomotor dysfunction associated with insufficient sleep

Area of Science:

• Cardiovascular Physiology
• Sleep Medicine
• Exercise Science

Background:

• Insufficient sleep (<7 hours/night) is linked to endothelial vasomotor dysfunction and increased cardiovascular disease (CVD) risk.
• Endothelial dysfunction, characterized by reduced vasodilation and increased vasoconstriction, is a key mechanism in CVD development.
• Regular aerobic exercise is known to improve endothelial function and reduce CVD risk.

Purpose of the Study:

• To test if regular aerobic exercise improves endothelial vasodilation and decreases endothelin (ET)-1-mediated vasoconstriction in middle-aged adults with chronic short sleep duration (<7 hours/night).
• To determine if exercise interventions can mitigate sleep-related endothelial dysfunction independent of changes in sleep duration.

Main Methods:

• Thirty-six healthy middle-aged adults were studied: 16 with normal sleep (7.4±0.1 h/night) and 20 with short sleep (6.2±0.1 h/night).
• The short sleepers underwent a 3-month aerobic exercise training program.
• Forearm blood flow was measured using plethysmography in response to acetylcholine (vasodilator), BQ-123 (ET_A receptor antagonist), and sodium nitroprusside.

Main Results:

• Short sleepers exhibited lower acetylcholine-mediated vasodilation compared to normal sleepers.
• Short sleepers showed a greater increase in forearm blood flow with BQ-123, indicating higher ET-1 mediated vasoconstriction.
• Following exercise, despite unchanged sleep duration (6.4±0.1 h/night), short sleepers showed enhanced acetylcholine-mediated vasodilation and reduced ET-1 mediated vasoconstriction.

Conclusions:

• Regular aerobic exercise effectively counteracts endothelial vasomotor dysfunction associated with insufficient sleep.
• Exercise improves endothelium-dependent vasodilation and reduces ET-1 mediated vasoconstriction in short sleepers.
• These benefits occur independently of changes in nightly sleep duration, suggesting exercise as a viable strategy to mitigate CVD risk in individuals with insufficient sleep.