A Prior High-Intensity Exercise Bout Attenuates the Vascular Dysfunction Resulting From a Prolonged Sedentary Bout

Area of Science:

• Exercise Physiology
• Cardiovascular Health
• Vascular Function

Background:

• Prolonged sedentary behavior is linked to vascular dysfunction.
• Understanding interventions to mitigate sedentary risks is crucial.

Purpose of the Study:

• To investigate if high-intensity interval aerobic exercise attenuates vascular dysfunction from prolonged sitting.
• To assess the impact on lower limb vascular function, oxidative stress, and inflammation.

Main Methods:

• Ten healthy young males underwent two 3-hour sitting sessions: one with prior high-intensity interval aerobic exercise (SIT-EX) and one without (SIT).
• Leg vascular function was measured using the passive leg movement technique before and after sitting.
• Blood samples analyzed for oxidative stress and inflammation markers.

Main Results:

• Prolonged sitting significantly reduced leg vascular function in the SIT condition.
• Leg vascular function remained unchanged in the SIT-EX condition.
• No significant changes in oxidative stress or inflammation markers were observed in either condition.

Conclusions:

• An acute session of high-intensity interval aerobic exercise effectively attenuated vascular dysfunction induced by prolonged sitting.
• The protective effect on vascular function was not associated with changes in circulating oxidative stress or inflammation markers.