Aerobic training status does not attenuate prolonged sitting-induced lower limb vascular dysfunction.

Area of Science:

• Exercise Physiology
• Vascular Biology
• Sports Medicine

Background:

• Prolonged sitting is linked to lower limb vascular dysfunction.
• The protective role of aerobic training against this dysfunction is not well understood.

Purpose of the Study:

• To investigate if aerobic training (AT) protects against vascular dysfunction caused by prolonged sitting.
• To compare vascular function in aerobically trained (AT) versus untrained (UT) individuals after a 3-hour sitting bout.

Main Methods:

• Ten AT and ten UT individuals underwent a 3-hour sitting period.
• Leg vascular function was assessed using the passive leg movement (PLM) technique before and during sitting.
• Measurements included peak leg blood flow (LBF) and LBF area under the curve.

Main Results:

• Both AT and UT groups showed significant reductions in PLM-induced hyperemia after 1.5 and 3 hours of sitting.
• No significant differences in the reduction of leg vascular function were observed between the AT and UT groups.
• Maximal oxygen uptake did not correlate with the degree of vascular dysfunction.

Conclusions:

• Aerobic training does not appear to offer protection against the vascular dysfunction induced by prolonged sitting.
• Reducing sedentary behavior is crucial for maintaining lower limb vascular health in all individuals, regardless of training status.